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stroke-width: 1px;
}

.xdsm .mdo {
fill: #FFCCCC;
stroke: black;
stroke-width: 1px;
}

.xdsm .function {
fill: #F2CCD9;
stroke: black;
stroke-width: 1px;
}

.xdsm .mda {
fill: #FFE5CC;
stroke: black;
stroke-width: 1px;
}

.xdsm .metamodel {
fill: #FFFCCC;
stroke: black;
stroke-width: 1px;
}

/* Title */
.xdsm g.title text {
display: block;
font-size: 2em;
margin-top: 0.67em;
margin-bottom: 0.67em;
margin-left: 0;
margin-right: 0;
font-family:Arial;
}
.xdsm g.title rect {
fill: none;
}


/* Text Default */
.xdsm text {
fill: black;
stroke: none;
font-size: 16pt;
font-family:Arial;
}
.xdsm tspan.sub {
font-size: small;
font-family:Arial;
}
.xdsm tspan.sup {
font-size: small;
font-family:Arial;
}

/* Data */
.xdsm .dataInter polygon {
fill: #E5E5E5;
stroke: black;
stroke-width: 1px;
}

.xdsm .dataIO polygon {
fill: #FFFFFF;
stroke: black;
stroke-width: 1px;
}

/* Dataflow */
.xdsm g.dataflow {
fill: none;
stroke: grey;
stroke-width: 8px;
}

/* Workflow */
.xdsm g.workflow {
fill: none;
stroke: black;
stroke-width: 2px;
}

/* Tooltip */
div.tooltip {
position: absolute;
text-align: center;
font-size: 16pt;
padding: 10px;
background: lightsteelblue;
border: 0px;
border-radius: 8px;
pointer-events: none;
}

div.treeDiv {
position: absolute;
}

div.contextDiv {
position: absolute;
}

sub, sup {
/* Specified in % so that the sup/sup is the right size relative to the surrounding text */
font-size: 75%;
/* Zero out the line-height so that it doesn't interfere with the positioning that follows */
line-height: 0;
/* Where the magic happens: makes all browsers position the sup/sup properly, relative to the surrounding text */
position: relative;
/* Note that if you're using Eric Meyer's reset.css, this is already set and you can remove this rule */
vertical-align: baseline;
}

sup {
/* Move the superscripted text up */
top: -0.5em;
}

sub {
/* Move the subscripted text down, but only half as far down as the superscript moved up */
bottom: -0.5em;
}


/*Edge Bundles Styles*/
/*##############################################################*/
.edgeBundlesNode {
  fill: #aaa;
}

.edgeBundlesNode:hover {
  fill: #555555;
}

.edgeBundlesLink {
  stroke: #3399FF;
  stroke-opacity: 0.4;
  stroke-width: 2px;
  fill: none;
  
}

.invisibleLink {
  stroke: #000;
  stroke-opacity: 0;
  stroke-width: 15px;
  fill: none;
}
.invisibleLink:hover {
  stroke: #3399FF;
  stroke-opacity: 1.0;
  stroke-width: 5px;
  fill: none;
}

.edgeBundlesNode:hover,
.edgeBundlesNode--source,
.edgeBundlesNode--target {
  font-weight: 700;
}

.edgeBundlesNode--source {
  fill: #99CC00;
}

.edgeBundlesNode--target {
  fill: #CC0000;
}

.edgeBundlesLink--target,
.edgeBundlesLink--source{
  stroke-width: 5px;
}

.edgeBundlesLink--source {
  stroke: #CC0000;
  stroke-opacity: .5;
}

.edgeBundlesLink--target {
  stroke: #99CC00;
  stroke-opacity: .5;
}

.sankeyNode rect {
  cursor: grab;
  shape-rendering: crispEdges;
}

.sankeyNode text {
  pointer-events: none;
  text-shadow: 1px 1px 2px #fff;
  font-size: 0.8em;
  font-family: sans-serif;
}

#tooltip {
  position: absolute;
  pointer-events: none;
  font-size: 0.7em;
  font-family: sans-serif;
  padding: 3px;
  width: auto;
  height: auto;
  background-color: #F2F2F2;
  -webkit-box-shadow: 0px 0px 5px rgba(0, 0, 0, 0.4);
  -mox-box-shadow: 0px 0px 0px 5px rgba(0, 0, 0, 0.4);
  box-shadow: 0px 0px 5px rbga(0, 0, 0, 0.4);
  pointer-events: none;
}

.value {
  white-space: pre-line;
  margin: 0;
}

/* Aigner: New styles for tree layout */
.treeNode {
cursor: pointer;
}

.overlay{
background-color:#FFF;
}

.treeNode circle {
fill: #fff;
stroke: #3399FF;
stroke-width: 1.5px;
}

.treeNode text {
font-size:16pt; 
font-family:Arial;
}

.treeLink {
fill: none;
stroke: #ccc;
stroke-width: 1.5px;
}

.d3-context-menu {
	position: absolute;
	display: none;
	background-color: #f2f2f2;
	border-radius: 4px;
	font-family: Arial;
	font-size: 16pt;
	width: 300px;
	border: 1px solid #d4d4d4;
	z-index:1200;
}
.d3-context-menu ul {
	list-style-type: none;
	margin: 4px 0px;
	padding: 0px;
	cursor: default;
}
.d3-context-menu ul li {
	padding: 4px 16px;
}
.d3-context-menu ul li:hover {
	background-color: #3399FF;
}
.d3-context-menu ul li > ul {
    position: absolute; 
    background-color: #f2f2f2; 
    top: 0;
	min-width: 350px;
    left: 290px; 
    z-index: -1; 
} 

.d3-context-menu ul li > ul li:hover 
{ 
    background-color: #3399FF;
	color: #fefefe;
}

.button {
fill: #555555;
stroke: white;
stroke-width: 1.5;
}

.copyRightText {
font-family: Arial;
font-size: 12pt;
fill: #555555;
}

.newDiv {
	position:relative;
	top: -100px;
	left: 220px;
	background-color: none;
}
.newDiv a {
    text-decoration: none;
    color: white;
    font-family: Arial;
    font-size: 20pt;
    padding-top: 12px;
    padding-right: 12px;
    padding-bottom: 12px;
    padding-left: 6px;
    display:inline-block;
}
.newDiv ul {
  display:  inline-block;;
  margin: 0;
  padding: 0;
  background-color: #555555;
}
.newDiv ul li {display: inline-block;}
.newDiv ul li:hover {background: #888;}
.newDiv ul li:hover ul {display: block;}
.newDiv ul li ul {
  position: absolute;
  min-width: 200px;
  display: none;
}
.newDiv ul li ul li { 
  background: #555; 
  display: block;
}
.newDiv ul li ul li a {
	display:block !important
} 
.newDiv ul li ul li:hover {background: #3399FF;}


.dataModelDiv {
	position:relative;
	top: 0px;
	left: 10px;
	background-color: none;
}
.dataModelDiv a {
    text-decoration: none;
    color: white;
    font-family: Arial;
    font-size: 16pt;
    padding-top: 5px;
    padding-right: 12px;
    padding-bottom: 5px;
    padding-left: 16px;
    display:inline-block;
}
.dataModelDiv ul {
  display:  inline-block;
  margin: 0;
  padding: 0;
  background-color: #555555;
  border-radius: 5px;
  border-style: solid; 
  border-width: 2px;
  border-color: #555555;
}
.dataModelDiv ul li {display: inline-block;}
.dataModelDiv ul li:hover {
	background: #888;
}
.dataModelDiv ul li:hover ul {display: block;}
.dataModelDiv ul li ul {
  position: absolute;
  align: right;
  left: 150px;
  top: 0px;
  min-width: 180px;
  display: none;
}
.dataModelDiv ul li ul li { 
  background: #555555; 
  display: block;
}
.dataModelDiv ul li ul li a {
	display:block !important
} 
.dataModelDiv ul li ul li:hover {background: #3399FF;}

table {
	width: 800px;
	table-layout:fixed;
}




table, th, td {
	font-family: Arial;
    font-size: 16pt;
	background-color: white;
    border: 2pt solid darkgrey;
    border-collapse: collapse;
	text-align: left;
	word-wrap:break-word;
}
}
th, td {
    padding-top: 6px;
    padding-right: 20px;
    padding-bottom: 6px;
    padding-left: 20px;
	min-width: 100px;
	max-width: 400px;
}

.remCircle {
	stroke: black;
	stroke-width: 2;
	fill: red;
	fill-opacity: .6
}
.remMinus {
	stroke: black;
	stroke-width: 2;
}

</style>
<head>
    <meta charset="utf-8">
    <title>VISTOMS (Visualization Tool for MDO Systems)</title>
</head>
<body>
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			function createShiftArr(step) {

				var space = '    ';
				
				if ( isNaN(parseInt(step)) ) {  // argument is string
					space = step;
				} else { // argument is integer
					switch(step) {
						case 1: space = ' '; break;
						case 2: space = '  '; break;
						case 3: space = '   '; break;
						case 4: space = '    '; break;
						case 5: space = '     '; break;
						case 6: space = '      '; break;
						case 7: space = '       '; break;
						case 8: space = '        '; break;
						case 9: space = '         '; break;
						case 10: space = '          '; break;
						case 11: space = '           '; break;
						case 12: space = '            '; break;
					}
				}

				var shift = ['\n']; // array of shifts
				for(ix=0;ix<100;ix++){
					shift.push(shift[ix]+space); 
				}
				return shift;
			}

			function vkbeautify(){
				this.step = '    '; // 4 spaces
				this.shift = createShiftArr(this.step);
			};

			vkbeautify.prototype.xml = function(text,step) {

				var ar = text.replace(/>\s{0,}</g,"><")
							 .replace(/</g,"~::~<")
							 .replace(/\s*xmlns\:/g,"~::~xmlns:")
							 .replace(/\s*xmlns\=/g,"~::~xmlns=")
							 .split('~::~'),
					len = ar.length,
					inComment = false,
					deep = 0,
					str = '',
					ix = 0,
					shift = step ? createShiftArr(step) : this.shift;

					for(ix=0;ix<len;ix++) {
						// start comment or <![CDATA[...]]> or <!DOCTYPE //
						if(ar[ix].search(/<!/) > -1) { 
							str += shift[deep]+ar[ix];
							inComment = true; 
							// end comment  or <![CDATA[...]]> //
							if(ar[ix].search(/-->/) > -1 || ar[ix].search(/\]>/) > -1 || ar[ix].search(/!DOCTYPE/) > -1 ) { 
								inComment = false; 
							}
						} else 
						// end comment  or <![CDATA[...]]> //
						if(ar[ix].search(/-->/) > -1 || ar[ix].search(/\]>/) > -1) { 
							str += ar[ix];
							inComment = false; 
						} else 
						// <elm></elm> //
						if( /^<\w/.exec(ar[ix-1]) && /^<\/\w/.exec(ar[ix]) &&
							/^<[\w:\-\.\,]+/.exec(ar[ix-1]) == /^<\/[\w:\-\.\,]+/.exec(ar[ix])[0].replace('/','')) { 
							str += ar[ix];
							if(!inComment) deep--;
						} else
						 // <elm> //
						if(ar[ix].search(/<\w/) > -1 && ar[ix].search(/<\//) == -1 && ar[ix].search(/\/>/) == -1 ) {
							str = !inComment ? str += shift[deep++]+ar[ix] : str += ar[ix];
						} else 
						 // <elm>...</elm> //
						if(ar[ix].search(/<\w/) > -1 && ar[ix].search(/<\//) > -1) {
							str = !inComment ? str += shift[deep]+ar[ix] : str += ar[ix];
						} else 
						// </elm> //
						if(ar[ix].search(/<\//) > -1) { 
							str = !inComment ? str += shift[--deep]+ar[ix] : str += ar[ix];
						} else 
						// <elm/> //
						if(ar[ix].search(/\/>/) > -1 ) { 
							str = !inComment ? str += shift[deep]+ar[ix] : str += ar[ix];
						} else 
						// <? xml ... ?> //
						if(ar[ix].search(/<\?/) > -1) { 
							str += shift[deep]+ar[ix];
						} else 
						// xmlns //
						if( ar[ix].search(/xmlns\:/) > -1  || ar[ix].search(/xmlns\=/) > -1) { 
							str += shift[deep]+ar[ix];
						} 
						
						else {
							str += ar[ix];
						}
					}
					
				return  (str[0] == '\n') ? str.slice(1) : str;
			}

			vkbeautify.prototype.json = function(text,step) {

				var step = step ? step : this.step;
				
				if (typeof JSON === 'undefined' ) return text; 
				
				if ( typeof text === "string" ) return JSON.stringify(JSON.parse(text), null, step);
				if ( typeof text === "object" ) return JSON.stringify(text, null, step);
					
				return text; // text is not string nor object
			}

			vkbeautify.prototype.css = function(text, step) {

				var ar = text.replace(/\s{1,}/g,' ')
							.replace(/\{/g,"{~::~")
							.replace(/\}/g,"~::~}~::~")
							.replace(/\;/g,";~::~")
							.replace(/\/\*/g,"~::~/*")
							.replace(/\*\//g,"*/~::~")
							.replace(/~::~\s{0,}~::~/g,"~::~")
							.split('~::~'),
					len = ar.length,
					deep = 0,
					str = '',
					ix = 0,
					shift = step ? createShiftArr(step) : this.shift;
					
					for(ix=0;ix<len;ix++) {

						if( /\{/.exec(ar[ix]))  { 
							str += shift[deep++]+ar[ix];
						} else 
						if( /\}/.exec(ar[ix]))  { 
							str += shift[--deep]+ar[ix];
						} else
						if( /\*\\/.exec(ar[ix]))  { 
							str += shift[deep]+ar[ix];
						}
						else {
							str += shift[deep]+ar[ix];
						}
					}
					return str.replace(/^\n{1,}/,'');
			}

			//----------------------------------------------------------------------------

			function isSubquery(str, parenthesisLevel) {
				return  parenthesisLevel - (str.replace(/\(/g,'').length - str.replace(/\)/g,'').length )
			}

			function split_sql(str, tab) {

				return str.replace(/\s{1,}/g," ")

							.replace(/ AND /ig,"~::~"+tab+tab+"AND ")
							.replace(/ BETWEEN /ig,"~::~"+tab+"BETWEEN ")
							.replace(/ CASE /ig,"~::~"+tab+"CASE ")
							.replace(/ ELSE /ig,"~::~"+tab+"ELSE ")
							.replace(/ END /ig,"~::~"+tab+"END ")
							.replace(/ FROM /ig,"~::~FROM ")
							.replace(/ GROUP\s{1,}BY/ig,"~::~GROUP BY ")
							.replace(/ HAVING /ig,"~::~HAVING ")
							//.replace(/ SET /ig," SET~::~")
							.replace(/ IN /ig," IN ")
							
							.replace(/ JOIN /ig,"~::~JOIN ")
							.replace(/ CROSS~::~{1,}JOIN /ig,"~::~CROSS JOIN ")
							.replace(/ INNER~::~{1,}JOIN /ig,"~::~INNER JOIN ")
							.replace(/ LEFT~::~{1,}JOIN /ig,"~::~LEFT JOIN ")
							.replace(/ RIGHT~::~{1,}JOIN /ig,"~::~RIGHT JOIN ")
							
							.replace(/ ON /ig,"~::~"+tab+"ON ")
							.replace(/ OR /ig,"~::~"+tab+tab+"OR ")
							.replace(/ ORDER\s{1,}BY/ig,"~::~ORDER BY ")
							.replace(/ OVER /ig,"~::~"+tab+"OVER ")

							.replace(/\(\s{0,}SELECT /ig,"~::~(SELECT ")
							.replace(/\)\s{0,}SELECT /ig,")~::~SELECT ")
							
							.replace(/ THEN /ig," THEN~::~"+tab+"")
							.replace(/ UNION /ig,"~::~UNION~::~")
							.replace(/ USING /ig,"~::~USING ")
							.replace(/ WHEN /ig,"~::~"+tab+"WHEN ")
							.replace(/ WHERE /ig,"~::~WHERE ")
							.replace(/ WITH /ig,"~::~WITH ")
							
							//.replace(/\,\s{0,}\(/ig,",~::~( ")
							//.replace(/\,/ig,",~::~"+tab+tab+"")

							.replace(/ ALL /ig," ALL ")
							.replace(/ AS /ig," AS ")
							.replace(/ ASC /ig," ASC ")	
							.replace(/ DESC /ig," DESC ")	
							.replace(/ DISTINCT /ig," DISTINCT ")
							.replace(/ EXISTS /ig," EXISTS ")
							.replace(/ NOT /ig," NOT ")
							.replace(/ NULL /ig," NULL ")
							.replace(/ LIKE /ig," LIKE ")
							.replace(/\s{0,}SELECT /ig,"SELECT ")
							.replace(/\s{0,}UPDATE /ig,"UPDATE ")
							.replace(/ SET /ig," SET ")
										
							.replace(/~::~{1,}/g,"~::~")
							.split('~::~');
			}

			vkbeautify.prototype.sql = function(text,step) {

				var ar_by_quote = text.replace(/\s{1,}/g," ")
										.replace(/\'/ig,"~::~\'")
										.split('~::~'),
					len = ar_by_quote.length,
					ar = [],
					deep = 0,
					tab = this.step,//+this.step,
					inComment = true,
					inQuote = false,
					parenthesisLevel = 0,
					str = '',
					ix = 0,
					shift = step ? createShiftArr(step) : this.shift;;

					for(ix=0;ix<len;ix++) {
						if(ix%2) {
							ar = ar.concat(ar_by_quote[ix]);
						} else {
							ar = ar.concat(split_sql(ar_by_quote[ix], tab) );
						}
					}
					
					len = ar.length;
					for(ix=0;ix<len;ix++) {
						
						parenthesisLevel = isSubquery(ar[ix], parenthesisLevel);
						
						if( /\s{0,}\s{0,}SELECT\s{0,}/.exec(ar[ix]))  { 
							ar[ix] = ar[ix].replace(/\,/g,",\n"+tab+tab+"")
						} 
						
						if( /\s{0,}\s{0,}SET\s{0,}/.exec(ar[ix]))  { 
							ar[ix] = ar[ix].replace(/\,/g,",\n"+tab+tab+"")
						} 
						
						if( /\s{0,}\(\s{0,}SELECT\s{0,}/.exec(ar[ix]))  { 
							deep++;
							str += shift[deep]+ar[ix];
						} else 
						if( /\'/.exec(ar[ix]) )  { 
							if(parenthesisLevel<1 && deep) {
								deep--;
							}
							str += ar[ix];
						}
						else  { 
							str += shift[deep]+ar[ix];
							if(parenthesisLevel<1 && deep) {
								deep--;
							}
						} 
						var junk = 0;
					}

					str = str.replace(/^\n{1,}/,'').replace(/\n{1,}/g,"\n");
					return str;
			}


			vkbeautify.prototype.xmlmin = function(text, preserveComments) {

				var str = preserveComments ? text
										   : text.replace(/\<![ \r\n\t]*(--([^\-]|[\r\n]|-[^\-])*--[ \r\n\t]*)\>/g,"")
												 .replace(/[ \r\n\t]{1,}xmlns/g, ' xmlns');
				return  str.replace(/>\s{0,}</g,"><"); 
			}

			vkbeautify.prototype.jsonmin = function(text) {

				if (typeof JSON === 'undefined' ) return text; 
				
				return JSON.stringify(JSON.parse(text), null, 0); 
							
			}

			vkbeautify.prototype.cssmin = function(text, preserveComments) {
				
				var str = preserveComments ? text
										   : text.replace(/\/\*([^*]|[\r\n]|(\*+([^*/]|[\r\n])))*\*+\//g,"") ;

				return str.replace(/\s{1,}/g,' ')
						  .replace(/\{\s{1,}/g,"{")
						  .replace(/\}\s{1,}/g,"}")
						  .replace(/\;\s{1,}/g,";")
						  .replace(/\/\*\s{1,}/g,"/*")
						  .replace(/\*\/\s{1,}/g,"*/");
			}

			vkbeautify.prototype.sqlmin = function(text) {
				return text.replace(/\s{1,}/g," ").replace(/\s{1,}\(/,"(").replace(/\s{1,}\)/,")");
			}

			window.vkbeautify = new vkbeautify();

			})();


			/*!
			 * Bootstrap v3.3.7 (http://getbootstrap.com)
			 * Copyright 2011-2016 Twitter, Inc.
			 * Licensed under the MIT license
			 */
			if("undefined"==typeof jQuery)throw new Error("Bootstrap's JavaScript requires jQuery");+function(a){"use strict";var b=a.fn.jquery.split(" ")[0].split(".");if(b[0]<2&&b[1]<9||1==b[0]&&9==b[1]&&b[2]<1||b[0]>3)throw new Error("Bootstrap's JavaScript requires jQuery version 1.9.1 or higher, but lower than version 4")}(jQuery),+function(a){"use strict";function b(){var a=document.createElement("bootstrap"),b={WebkitTransition:"webkitTransitionEnd",MozTransition:"transitionend",OTransition:"oTransitionEnd otransitionend",transition:"transitionend"};for(var c in b)if(void 0!==a.style[c])return{end:b[c]};return!1}a.fn.emulateTransitionEnd=function(b){var c=!1,d=this;a(this).one("bsTransitionEnd",function(){c=!0});var e=function(){c||a(d).trigger(a.support.transition.end)};return 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			this.activeTarget=b,this.clear();var c=this.selector+'[data-target="'+b+'"],'+this.selector+'[href="'+b+'"]',d=a(c).parents("li").addClass("active");d.parent(".dropdown-menu").length&&(d=d.closest("li.dropdown").addClass("active")),d.trigger("activate.bs.scrollspy")},b.prototype.clear=function(){a(this.selector).parentsUntil(this.options.target,".active").removeClass("active")};var d=a.fn.scrollspy;a.fn.scrollspy=c,a.fn.scrollspy.Constructor=b,a.fn.scrollspy.noConflict=function(){return a.fn.scrollspy=d,this},a(window).on("load.bs.scrollspy.data-api",function(){a('[data-spy="scroll"]').each(function(){var b=a(this);c.call(b,b.data())})})}(jQuery),+function(a){"use strict";function b(b){return this.each(function(){var d=a(this),e=d.data("bs.tab");e||d.data("bs.tab",e=new c(this)),"string"==typeof b&&e[b]()})}var c=function(b){this.element=a(b)};c.VERSION="3.3.7",c.TRANSITION_DURATION=150,c.prototype.show=function(){var b=this.element,c=b.closest("ul:not(.dropdown-menu)"),d=b.data("target");if(d||(d=b.attr("href"),d=d&&d.replace(/.*(?=#[^\s]*$)/,"")),!b.parent("li").hasClass("active")){var e=c.find(".active:last a"),f=a.Event("hide.bs.tab",{relatedTarget:b[0]}),g=a.Event("show.bs.tab",{relatedTarget:e[0]});if(e.trigger(f),b.trigger(g),!g.isDefaultPrevented()&&!f.isDefaultPrevented()){var h=a(d);this.activate(b.closest("li"),c),this.activate(h,h.parent(),function(){e.trigger({type:"hidden.bs.tab",relatedTarget:b[0]}),b.trigger({type:"shown.bs.tab",relatedTarget:e[0]})})}}},c.prototype.activate=function(b,d,e){function f(){g.removeClass("active").find("> .dropdown-menu > .active").removeClass("active").end().find('[data-toggle="tab"]').attr("aria-expanded",!1),b.addClass("active").find('[data-toggle="tab"]').attr("aria-expanded",!0),h?(b[0].offsetWidth,b.addClass("in")):b.removeClass("fade"),b.parent(".dropdown-menu").length&&b.closest("li.dropdown").addClass("active").end().find('[data-toggle="tab"]').attr("aria-expanded",!0),e&&e()}var g=d.find("> .active"),h=e&&a.support.transition&&(g.length&&g.hasClass("fade")||!!d.find("> .fade").length);g.length&&h?g.one("bsTransitionEnd",f).emulateTransitionEnd(c.TRANSITION_DURATION):f(),g.removeClass("in")};var d=a.fn.tab;a.fn.tab=b,a.fn.tab.Constructor=c,a.fn.tab.noConflict=function(){return a.fn.tab=d,this};var e=function(c){c.preventDefault(),b.call(a(this),"show")};a(document).on("click.bs.tab.data-api",'[data-toggle="tab"]',e).on("click.bs.tab.data-api",'[data-toggle="pill"]',e)}(jQuery),+function(a){"use strict";function b(b){return this.each(function(){var d=a(this),e=d.data("bs.affix"),f="object"==typeof b&&b;e||d.data("bs.affix",e=new c(this,f)),"string"==typeof b&&e[b]()})}var c=function(b,d){this.options=a.extend({},c.DEFAULTS,d),this.$target=a(this.options.target).on("scroll.bs.affix.data-api",a.proxy(this.checkPosition,this)).on("click.bs.affix.data-api",a.proxy(this.checkPositionWithEventLoop,this)),this.$element=a(b),this.affixed=null,this.unpin=null,this.pinnedOffset=null,this.checkPosition()};c.VERSION="3.3.7",c.RESET="affix affix-top affix-bottom",c.DEFAULTS={offset:0,target:window},c.prototype.getState=function(a,b,c,d){var e=this.$target.scrollTop(),f=this.$element.offset(),g=this.$target.height();if(null!=c&&"top"==this.affixed)return e<c&&"top";if("bottom"==this.affixed)return null!=c?!(e+this.unpin<=f.top)&&"bottom":!(e+g<=a-d)&&"bottom";var h=null==this.affixed,i=h?e:f.top,j=h?g:b;return null!=c&&e<=c?"top":null!=d&&i+j>=a-d&&"bottom"},c.prototype.getPinnedOffset=function(){if(this.pinnedOffset)return this.pinnedOffset;this.$element.removeClass(c.RESET).addClass("affix");var a=this.$target.scrollTop(),b=this.$element.offset();return this.pinnedOffset=b.top-a},c.prototype.checkPositionWithEventLoop=function(){setTimeout(a.proxy(this.checkPosition,this),1)},c.prototype.checkPosition=function(){if(this.$element.is(":visible")){var b=this.$element.height(),d=this.options.offset,e=d.top,f=d.bottom,g=Math.max(a(document).height(),a(document.body).height());"object"!=typeof d&&(f=e=d),"function"==typeof e&&(e=d.top(this.$element)),"function"==typeof f&&(f=d.bottom(this.$element));var h=this.getState(g,b,e,f);if(this.affixed!=h){null!=this.unpin&&this.$element.css("top","");var i="affix"+(h?"-"+h:""),j=a.Event(i+".bs.affix");if(this.$element.trigger(j),j.isDefaultPrevented())return;this.affixed=h,this.unpin="bottom"==h?this.getPinnedOffset():null,this.$element.removeClass(c.RESET).addClass(i).trigger(i.replace("affix","affixed")+".bs.affix")}"bottom"==h&&this.$element.offset({top:g-b-f})}};var d=a.fn.affix;a.fn.affix=b,a.fn.affix.Constructor=c,a.fn.affix.noConflict=function(){return a.fn.affix=d,this},a(window).on("load",function(){a('[data-spy="affix"]').each(function(){var c=a(this),d=c.data();d.offset=d.offset||{},null!=d.offsetBottom&&(d.offset.bottom=d.offsetBottom),null!=d.offsetTop&&(d.offset.top=d.offsetTop),b.call(c,d)})})}(jQuery);


			/**
			 * bootbox.js v4.4.0
			 *
			 * http://bootboxjs.com/license.txt
			 */
			!function(a,b){"use strict";"function"==typeof define&&define.amd?define(["jquery"],b):"object"==typeof exports?module.exports=b(require("jquery")):a.bootbox=b(a.jQuery)}(this,function a(b,c){"use strict";function d(a){var b=q[o.locale];return b?b[a]:q.en[a]}function e(a,c,d){a.stopPropagation(),a.preventDefault();var e=b.isFunction(d)&&d.call(c,a)===!1;e||c.modal("hide")}function f(a){var b,c=0;for(b in a)c++;return c}function g(a,c){var d=0;b.each(a,function(a,b){c(a,b,d++)})}function h(a){var c,d;if("object"!=typeof a)throw new Error("Please supply an object of options");if(!a.message)throw new Error("Please specify a message");return a=b.extend({},o,a),a.buttons||(a.buttons={}),c=a.buttons,d=f(c),g(c,function(a,e,f){if(b.isFunction(e)&&(e=c[a]={callback:e}),"object"!==b.type(e))throw new Error("button with key "+a+" must be an object");e.label||(e.label=a),e.className||(e.className=2>=d&&f===d-1?"btn-primary":"btn-default")}),a}function i(a,b){var c=a.length,d={};if(1>c||c>2)throw new Error("Invalid argument length");return 2===c||"string"==typeof a[0]?(d[b[0]]=a[0],d[b[1]]=a[1]):d=a[0],d}function j(a,c,d){return b.extend(!0,{},a,i(c,d))}function k(a,b,c,d){var e={className:"bootbox-"+a,buttons:l.apply(null,b)};return m(j(e,d,c),b)}function l(){for(var a={},b=0,c=arguments.length;c>b;b++){var e=arguments[b],f=e.toLowerCase(),g=e.toUpperCase();a[f]={label:d(g)}}return a}function m(a,b){var d={};return g(b,function(a,b){d[b]=!0}),g(a.buttons,function(a){if(d[a]===c)throw new Error("button key "+a+" is not allowed (options are "+b.join("\n")+")")}),a}var n={dialog:"<div class='bootbox modal' tabindex='-1' role='dialog'><div class='modal-dialog'><div class='modal-content'><div class='modal-body'><div class='bootbox-body'></div></div></div></div></div>",header:"<div class='modal-header'><h4 class='modal-title'></h4></div>",footer:"<div class='modal-footer'></div>",closeButton:"<button type='button' class='bootbox-close-button close' data-dismiss='modal' aria-hidden='true'>&times;</button>",form:"<form class='bootbox-form'></form>",inputs:{text:"<input class='bootbox-input bootbox-input-text form-control' autocomplete=off type=text />",textarea:"<textarea class='bootbox-input bootbox-input-textarea form-control'></textarea>",email:"<input class='bootbox-input bootbox-input-email form-control' autocomplete='off' type='email' />",select:"<select class='bootbox-input bootbox-input-select form-control'></select>",checkbox:"<div class='checkbox'><label><input class='bootbox-input bootbox-input-checkbox' type='checkbox' /></label></div>",date:"<input class='bootbox-input bootbox-input-date form-control' autocomplete=off type='date' />",time:"<input class='bootbox-input bootbox-input-time form-control' autocomplete=off type='time' />",number:"<input class='bootbox-input bootbox-input-number form-control' autocomplete=off type='number' />",password:"<input class='bootbox-input bootbox-input-password form-control' autocomplete='off' type='password' />"}},o={locale:"en",backdrop:"static",animate:!0,className:null,closeButton:!0,show:!0,container:"body"},p={};p.alert=function(){var a;if(a=k("alert",["ok"],["message","callback"],arguments),a.callback&&!b.isFunction(a.callback))throw new Error("alert requires callback property to be a function when provided");return a.buttons.ok.callback=a.onEscape=function(){return b.isFunction(a.callback)?a.callback.call(this):!0},p.dialog(a)},p.confirm=function(){var a;if(a=k("confirm",["cancel","confirm"],["message","callback"],arguments),a.buttons.cancel.callback=a.onEscape=function(){return a.callback.call(this,!1)},a.buttons.confirm.callback=function(){return a.callback.call(this,!0)},!b.isFunction(a.callback))throw new Error("confirm requires a callback");return p.dialog(a)},p.prompt=function(){var a,d,e,f,h,i,k;if(f=b(n.form),d={className:"bootbox-prompt",buttons:l("cancel","confirm"),value:"",inputType:"text"},a=m(j(d,arguments,["title","callback"]),["cancel","confirm"]),i=a.show===c?!0:a.show,a.message=f,a.buttons.cancel.callback=a.onEscape=function(){return a.callback.call(this,null)},a.buttons.confirm.callback=function(){var c;switch(a.inputType){case"text":case"textarea":case"email":case"select":case"date":case"time":case"number":case"password":c=h.val();break;case"checkbox":var d=h.find("input:checked");c=[],g(d,function(a,d){c.push(b(d).val())})}return a.callback.call(this,c)},a.show=!1,!a.title)throw new Error("prompt requires a title");if(!b.isFunction(a.callback))throw new Error("prompt requires a callback");if(!n.inputs[a.inputType])throw new Error("invalid prompt type");switch(h=b(n.inputs[a.inputType]),a.inputType){case"text":case"textarea":case"email":case"date":case"time":case"number":case"password":h.val(a.value);break;case"select":var o={};if(k=a.inputOptions||[],!b.isArray(k))throw new Error("Please pass an array of input options");if(!k.length)throw new Error("prompt with select requires options");g(k,function(a,d){var e=h;if(d.value===c||d.text===c)throw new Error("given options in wrong format");d.group&&(o[d.group]||(o[d.group]=b("<optgroup/>").attr("label",d.group)),e=o[d.group]),e.append("<option value='"+d.value+"'>"+d.text+"</option>")}),g(o,function(a,b){h.append(b)}),h.val(a.value);break;case"checkbox":var q=b.isArray(a.value)?a.value:[a.value];if(k=a.inputOptions||[],!k.length)throw new Error("prompt with checkbox requires options");if(!k[0].value||!k[0].text)throw new Error("given options in wrong format");h=b("<div/>"),g(k,function(c,d){var e=b(n.inputs[a.inputType]);e.find("input").attr("value",d.value),e.find("label").append(d.text),g(q,function(a,b){b===d.value&&e.find("input").prop("checked",!0)}),h.append(e)})}return a.placeholder&&h.attr("placeholder",a.placeholder),a.pattern&&h.attr("pattern",a.pattern),a.maxlength&&h.attr("maxlength",a.maxlength),f.append(h),f.on("submit",function(a){a.preventDefault(),a.stopPropagation(),e.find(".btn-primary").click()}),e=p.dialog(a),e.off("shown.bs.modal"),e.on("shown.bs.modal",function(){h.focus()}),i===!0&&e.modal("show"),e},p.dialog=function(a){a=h(a);var d=b(n.dialog),f=d.find(".modal-dialog"),i=d.find(".modal-body"),j=a.buttons,k="",l={onEscape:a.onEscape};if(b.fn.modal===c)throw new Error("$.fn.modal is not defined; please double check you have included the Bootstrap JavaScript library. See http://getbootstrap.com/javascript/ for more details.");if(g(j,function(a,b){k+="<button data-bb-handler='"+a+"' type='button' class='btn "+b.className+"'>"+b.label+"</button>",l[a]=b.callback}),i.find(".bootbox-body").html(a.message),a.animate===!0&&d.addClass("fade"),a.className&&d.addClass(a.className),"large"===a.size?f.addClass("modal-lg"):"small"===a.size&&f.addClass("modal-sm"),a.title&&i.before(n.header),a.closeButton){var m=b(n.closeButton);a.title?d.find(".modal-header").prepend(m):m.css("margin-top","-10px").prependTo(i)}return a.title&&d.find(".modal-title").html(a.title),k.length&&(i.after(n.footer),d.find(".modal-footer").html(k)),d.on("hidden.bs.modal",function(a){a.target===this&&d.remove()}),d.on("shown.bs.modal",function(){d.find(".btn-primary:first").focus()}),"static"!==a.backdrop&&d.on("click.dismiss.bs.modal",function(a){d.children(".modal-backdrop").length&&(a.currentTarget=d.children(".modal-backdrop").get(0)),a.target===a.currentTarget&&d.trigger("escape.close.bb")}),d.on("escape.close.bb",function(a){l.onEscape&&e(a,d,l.onEscape)}),d.on("click",".modal-footer button",function(a){var c=b(this).data("bb-handler");e(a,d,l[c])}),d.on("click",".bootbox-close-button",function(a){e(a,d,l.onEscape)}),d.on("keyup",function(a){27===a.which&&d.trigger("escape.close.bb")}),b(a.container).append(d),d.modal({backdrop:a.backdrop?"static":!1,keyboard:!1,show:!1}),a.show&&d.modal("show"),d},p.setDefaults=function(){var a={};2===arguments.length?a[arguments[0]]=arguments[1]:a=arguments[0],b.extend(o,a)},p.hideAll=function(){return b(".bootbox").modal("hide"),p};var q={bg_BG:{OK:"Ок",CANCEL:"Отказ",CONFIRM:"Потвърждавам"},br:{OK:"OK",CANCEL:"Cancelar",CONFIRM:"Sim"},cs:{OK:"OK",CANCEL:"Zrušit",CONFIRM:"Potvrdit"},da:{OK:"OK",CANCEL:"Annuller",CONFIRM:"Accepter"},de:{OK:"OK",CANCEL:"Abbrechen",CONFIRM:"Akzeptieren"},el:{OK:"Εντάξει",CANCEL:"Ακύρωση",CONFIRM:"Επιβεβαίωση"},en:{OK:"OK",CANCEL:"Cancel",CONFIRM:"OK"},es:{OK:"OK",CANCEL:"Cancelar",CONFIRM:"Aceptar"},et:{OK:"OK",CANCEL:"Katkesta",CONFIRM:"OK"},fa:{OK:"قبول",CANCEL:"لغو",CONFIRM:"تایید"},fi:{OK:"OK",CANCEL:"Peruuta",CONFIRM:"OK"},fr:{OK:"OK",CANCEL:"Annuler",CONFIRM:"D'accord"},he:{OK:"אישור",CANCEL:"ביטול",CONFIRM:"אישור"},hu:{OK:"OK",CANCEL:"Mégsem",CONFIRM:"Megerősít"},hr:{OK:"OK",CANCEL:"Odustani",CONFIRM:"Potvrdi"},id:{OK:"OK",CANCEL:"Batal",CONFIRM:"OK"},it:{OK:"OK",CANCEL:"Annulla",CONFIRM:"Conferma"},ja:{OK:"OK",CANCEL:"キャンセル",CONFIRM:"確認"},lt:{OK:"Gerai",CANCEL:"Atšaukti",CONFIRM:"Patvirtinti"},lv:{OK:"Labi",CANCEL:"Atcelt",CONFIRM:"Apstiprināt"},nl:{OK:"OK",CANCEL:"Annuleren",CONFIRM:"Accepteren"},no:{OK:"OK",CANCEL:"Avbryt",CONFIRM:"OK"},pl:{OK:"OK",CANCEL:"Anuluj",CONFIRM:"Potwierdź"},pt:{OK:"OK",CANCEL:"Cancelar",CONFIRM:"Confirmar"},ru:{OK:"OK",CANCEL:"Отмена",CONFIRM:"Применить"},sq:{OK:"OK",CANCEL:"Anulo",CONFIRM:"Prano"},sv:{OK:"OK",CANCEL:"Avbryt",CONFIRM:"OK"},th:{OK:"ตกลง",CANCEL:"ยกเลิก",CONFIRM:"ยืนยัน"},tr:{OK:"Tamam",CANCEL:"İptal",CONFIRM:"Onayla"},zh_CN:{OK:"OK",CANCEL:"取消",CONFIRM:"确认"},zh_TW:{OK:"OK",CANCEL:"取消",CONFIRM:"確認"}};return p.addLocale=function(a,c){return b.each(["OK","CANCEL","CONFIRM"],function(a,b){if(!c[b])throw new Error("Please supply a translation for '"+b+"'")}),q[a]={OK:c.OK,CANCEL:c.CANCEL,CONFIRM:c.CONFIRM},p},p.removeLocale=function(a){return delete q[a],p},p.setLocale=function(a){return p.setDefaults("locale",a)},p.init=function(c){return a(c||b)},p});
			
			/*!
			 * Bowser - a browser detector
			 * https://github.com/ded/bowser
			 * MIT License | (c) Dustin Diaz 2015
			 */
			//#################################################################################################
			!function (root, name, definition) {
			  if (typeof module != 'undefined' && module.exports) module.exports = definition()
			  else if (typeof define == 'function' && define.amd) define(name, definition)
			  else root[name] = definition()
			}(this, 'bowser', function () {
			  /**
				* See useragents.js for examples of navigator.userAgent
				*/

			  var t = true

			  function detect(ua) {

				function getFirstMatch(regex) {
				  var match = ua.match(regex);
				  return (match && match.length > 1 && match[1]) || '';
				}

				function getSecondMatch(regex) {
				  var match = ua.match(regex);
				  return (match && match.length > 1 && match[2]) || '';
				}

				var iosdevice = getFirstMatch(/(ipod|iphone|ipad)/i).toLowerCase()
				  , likeAndroid = /like android/i.test(ua)
				  , android = !likeAndroid && /android/i.test(ua)
				  , nexusMobile = /nexus\s*[0-6]\s*/i.test(ua)
				  , nexusTablet = !nexusMobile && /nexus\s*[0-9]+/i.test(ua)
				  , chromeos = /CrOS/.test(ua)
				  , silk = /silk/i.test(ua)
				  , sailfish = /sailfish/i.test(ua)
				  , tizen = /tizen/i.test(ua)
				  , webos = /(web|hpw)os/i.test(ua)
				  , windowsphone = /windows phone/i.test(ua)
				  , samsungBrowser = /SamsungBrowser/i.test(ua)
				  , windows = !windowsphone && /windows/i.test(ua)
				  , mac = !iosdevice && !silk && /macintosh/i.test(ua)
				  , linux = !android && !sailfish && !tizen && !webos && /linux/i.test(ua)
				  , edgeVersion = getFirstMatch(/edge\/(\d+(\.\d+)?)/i)
				  , versionIdentifier = getFirstMatch(/version\/(\d+(\.\d+)?)/i)
				  , tablet = /tablet/i.test(ua)
				  , mobile = !tablet && /[^-]mobi/i.test(ua)
				  , xbox = /xbox/i.test(ua)
				  , result

				if (/opera/i.test(ua)) {
				  //  an old Opera
				  result = {
					name: 'Opera'
				  , opera: t
				  , version: versionIdentifier || getFirstMatch(/(?:opera|opr|opios)[\s\/](\d+(\.\d+)?)/i)
				  }
				} else if (/opr|opios/i.test(ua)) {
				  // a new Opera
				  result = {
					name: 'Opera'
					, opera: t
					, version: getFirstMatch(/(?:opr|opios)[\s\/](\d+(\.\d+)?)/i) || versionIdentifier
				  }
				}
				else if (/SamsungBrowser/i.test(ua)) {
				  result = {
					name: 'Samsung Internet for Android'
					, samsungBrowser: t
					, version: versionIdentifier || getFirstMatch(/(?:SamsungBrowser)[\s\/](\d+(\.\d+)?)/i)
				  }
				}
				else if (/coast/i.test(ua)) {
				  result = {
					name: 'Opera Coast'
					, coast: t
					, version: versionIdentifier || getFirstMatch(/(?:coast)[\s\/](\d+(\.\d+)?)/i)
				  }
				}
				else if (/yabrowser/i.test(ua)) {
				  result = {
					name: 'Yandex Browser'
				  , yandexbrowser: t
				  , version: versionIdentifier || getFirstMatch(/(?:yabrowser)[\s\/](\d+(\.\d+)?)/i)
				  }
				}
				else if (/ucbrowser/i.test(ua)) {
				  result = {
					  name: 'UC Browser'
					, ucbrowser: t
					, version: getFirstMatch(/(?:ucbrowser)[\s\/](\d+(?:\.\d+)+)/i)
				  }
				}
				else if (/mxios/i.test(ua)) {
				  result = {
					name: 'Maxthon'
					, maxthon: t
					, version: getFirstMatch(/(?:mxios)[\s\/](\d+(?:\.\d+)+)/i)
				  }
				}
				else if (/epiphany/i.test(ua)) {
				  result = {
					name: 'Epiphany'
					, epiphany: t
					, version: getFirstMatch(/(?:epiphany)[\s\/](\d+(?:\.\d+)+)/i)
				  }
				}
				else if (/puffin/i.test(ua)) {
				  result = {
					name: 'Puffin'
					, puffin: t
					, version: getFirstMatch(/(?:puffin)[\s\/](\d+(?:\.\d+)?)/i)
				  }
				}
				else if (/sleipnir/i.test(ua)) {
				  result = {
					name: 'Sleipnir'
					, sleipnir: t
					, version: getFirstMatch(/(?:sleipnir)[\s\/](\d+(?:\.\d+)+)/i)
				  }
				}
				else if (/k-meleon/i.test(ua)) {
				  result = {
					name: 'K-Meleon'
					, kMeleon: t
					, version: getFirstMatch(/(?:k-meleon)[\s\/](\d+(?:\.\d+)+)/i)
				  }
				}
				else if (windowsphone) {
				  result = {
					name: 'Windows Phone'
				  , windowsphone: t
				  }
				  if (edgeVersion) {
					result.msedge = t
					result.version = edgeVersion
				  }
				  else {
					result.msie = t
					result.version = getFirstMatch(/iemobile\/(\d+(\.\d+)?)/i)
				  }
				}
				else if (/msie|trident/i.test(ua)) {
				  result = {
					name: 'Internet Explorer'
				  , msie: t
				  , version: getFirstMatch(/(?:msie |rv:)(\d+(\.\d+)?)/i)
				  }
				} else if (chromeos) {
				  result = {
					name: 'Chrome'
				  , chromeos: t
				  , chromeBook: t
				  , chrome: t
				  , version: getFirstMatch(/(?:chrome|crios|crmo)\/(\d+(\.\d+)?)/i)
				  }
				} else if (/chrome.+? edge/i.test(ua)) {
				  result = {
					name: 'Microsoft Edge'
				  , msedge: t
				  , version: edgeVersion
				  }
				}
				else if (/vivaldi/i.test(ua)) {
				  result = {
					name: 'Vivaldi'
					, vivaldi: t
					, version: getFirstMatch(/vivaldi\/(\d+(\.\d+)?)/i) || versionIdentifier
				  }
				}
				else if (sailfish) {
				  result = {
					name: 'Sailfish'
				  , sailfish: t
				  , version: getFirstMatch(/sailfish\s?browser\/(\d+(\.\d+)?)/i)
				  }
				}
				else if (/seamonkey\//i.test(ua)) {
				  result = {
					name: 'SeaMonkey'
				  , seamonkey: t
				  , version: getFirstMatch(/seamonkey\/(\d+(\.\d+)?)/i)
				  }
				}
				else if (/firefox|iceweasel|fxios/i.test(ua)) {
				  result = {
					name: 'Firefox'
				  , firefox: t
				  , version: getFirstMatch(/(?:firefox|iceweasel|fxios)[ \/](\d+(\.\d+)?)/i)
				  }
				  if (/\((mobile|tablet);[^\)]*rv:[\d\.]+\)/i.test(ua)) {
					result.firefoxos = t
				  }
				}
				else if (silk) {
				  result =  {
					name: 'Amazon Silk'
				  , silk: t
				  , version : getFirstMatch(/silk\/(\d+(\.\d+)?)/i)
				  }
				}
				else if (/phantom/i.test(ua)) {
				  result = {
					name: 'PhantomJS'
				  , phantom: t
				  , version: getFirstMatch(/phantomjs\/(\d+(\.\d+)?)/i)
				  }
				}
				else if (/slimerjs/i.test(ua)) {
				  result = {
					name: 'SlimerJS'
					, slimer: t
					, version: getFirstMatch(/slimerjs\/(\d+(\.\d+)?)/i)
				  }
				}
				else if (/blackberry|\bbb\d+/i.test(ua) || /rim\stablet/i.test(ua)) {
				  result = {
					name: 'BlackBerry'
				  , blackberry: t
				  , version: versionIdentifier || getFirstMatch(/blackberry[\d]+\/(\d+(\.\d+)?)/i)
				  }
				}
				else if (webos) {
				  result = {
					name: 'WebOS'
				  , webos: t
				  , version: versionIdentifier || getFirstMatch(/w(?:eb)?osbrowser\/(\d+(\.\d+)?)/i)
				  };
				  /touchpad\//i.test(ua) && (result.touchpad = t)
				}
				else if (/bada/i.test(ua)) {
				  result = {
					name: 'Bada'
				  , bada: t
				  , version: getFirstMatch(/dolfin\/(\d+(\.\d+)?)/i)
				  };
				}
				else if (tizen) {
				  result = {
					name: 'Tizen'
				  , tizen: t
				  , version: getFirstMatch(/(?:tizen\s?)?browser\/(\d+(\.\d+)?)/i) || versionIdentifier
				  };
				}
				else if (/qupzilla/i.test(ua)) {
				  result = {
					name: 'QupZilla'
					, qupzilla: t
					, version: getFirstMatch(/(?:qupzilla)[\s\/](\d+(?:\.\d+)+)/i) || versionIdentifier
				  }
				}
				else if (/chromium/i.test(ua)) {
				  result = {
					name: 'Chromium'
					, chromium: t
					, version: getFirstMatch(/(?:chromium)[\s\/](\d+(?:\.\d+)?)/i) || versionIdentifier
				  }
				}
				else if (/chrome|crios|crmo/i.test(ua)) {
				  result = {
					name: 'Chrome'
					, chrome: t
					, version: getFirstMatch(/(?:chrome|crios|crmo)\/(\d+(\.\d+)?)/i)
				  }
				}
				else if (android) {
				  result = {
					name: 'Android'
					, version: versionIdentifier
				  }
				}
				else if (/safari|applewebkit/i.test(ua)) {
				  result = {
					name: 'Safari'
				  , safari: t
				  }
				  if (versionIdentifier) {
					result.version = versionIdentifier
				  }
				}
				else if (iosdevice) {
				  result = {
					name : iosdevice == 'iphone' ? 'iPhone' : iosdevice == 'ipad' ? 'iPad' : 'iPod'
				  }
				  // WTF: version is not part of user agent in web apps
				  if (versionIdentifier) {
					result.version = versionIdentifier
				  }
				}
				else if(/googlebot/i.test(ua)) {
				  result = {
					name: 'Googlebot'
				  , googlebot: t
				  , version: getFirstMatch(/googlebot\/(\d+(\.\d+))/i) || versionIdentifier
				  }
				}
				else {
				  result = {
					name: getFirstMatch(/^(.*)\/(.*) /),
					version: getSecondMatch(/^(.*)\/(.*) /)
				 };
			   }

				// set webkit or gecko flag for browsers based on these engines
				if (!result.msedge && /(apple)?webkit/i.test(ua)) {
				  if (/(apple)?webkit\/537\.36/i.test(ua)) {
					result.name = result.name || "Blink"
					result.blink = t
				  } else {
					result.name = result.name || "Webkit"
					result.webkit = t
				  }
				  if (!result.version && versionIdentifier) {
					result.version = versionIdentifier
				  }
				} else if (!result.opera && /gecko\//i.test(ua)) {
				  result.name = result.name || "Gecko"
				  result.gecko = t
				  result.version = result.version || getFirstMatch(/gecko\/(\d+(\.\d+)?)/i)
				}

				// set OS flags for platforms that have multiple browsers
				if (!result.windowsphone && !result.msedge && (android || result.silk)) {
				  result.android = t
				} else if (!result.windowsphone && !result.msedge && iosdevice) {
				  result[iosdevice] = t
				  result.ios = t
				} else if (mac) {
				  result.mac = t
				} else if (xbox) {
				  result.xbox = t
				} else if (windows) {
				  result.windows = t
				} else if (linux) {
				  result.linux = t
				}

				function getWindowsVersion (s) {
				  switch (s) {
					case 'NT': return 'NT'
					case 'XP': return 'XP'
					case 'NT 5.0': return '2000'
					case 'NT 5.1': return 'XP'
					case 'NT 5.2': return '2003'
					case 'NT 6.0': return 'Vista'
					case 'NT 6.1': return '7'
					case 'NT 6.2': return '8'
					case 'NT 6.3': return '8.1'
					case 'NT 10.0': return '10'
					default: return undefined
				  }
				}
				
				// OS version extraction
				var osVersion = '';
				if (result.windows) {
				  osVersion = getWindowsVersion(getFirstMatch(/Windows ((NT|XP)( \d\d?.\d)?)/i))
				} else if (result.windowsphone) {
				  osVersion = getFirstMatch(/windows phone (?:os)?\s?(\d+(\.\d+)*)/i);
				} else if (result.mac) {
				  osVersion = getFirstMatch(/Mac OS X (\d+([_\.\s]\d+)*)/i);
				  osVersion = osVersion.replace(/[_\s]/g, '.');
				} else if (iosdevice) {
				  osVersion = getFirstMatch(/os (\d+([_\s]\d+)*) like mac os x/i);
				  osVersion = osVersion.replace(/[_\s]/g, '.');
				} else if (android) {
				  osVersion = getFirstMatch(/android[ \/-](\d+(\.\d+)*)/i);
				} else if (result.webos) {
				  osVersion = getFirstMatch(/(?:web|hpw)os\/(\d+(\.\d+)*)/i);
				} else if (result.blackberry) {
				  osVersion = getFirstMatch(/rim\stablet\sos\s(\d+(\.\d+)*)/i);
				} else if (result.bada) {
				  osVersion = getFirstMatch(/bada\/(\d+(\.\d+)*)/i);
				} else if (result.tizen) {
				  osVersion = getFirstMatch(/tizen[\/\s](\d+(\.\d+)*)/i);
				}
				if (osVersion) {
				  result.osversion = osVersion;
				}

				// device type extraction
				var osMajorVersion = !result.windows && osVersion.split('.')[0];
				if (
					 tablet
				  || nexusTablet
				  || iosdevice == 'ipad'
				  || (android && (osMajorVersion == 3 || (osMajorVersion >= 4 && !mobile)))
				  || result.silk
				) {
				  result.tablet = t
				} else if (
					 mobile
				  || iosdevice == 'iphone'
				  || iosdevice == 'ipod'
				  || android
				  || nexusMobile
				  || result.blackberry
				  || result.webos
				  || result.bada
				) {
				  result.mobile = t
				}

				// Graded Browser Support
				// http://developer.yahoo.com/yui/articles/gbs
				if (result.msedge ||
					(result.msie && result.version >= 10) ||
					(result.yandexbrowser && result.version >= 15) ||
						(result.vivaldi && result.version >= 1.0) ||
					(result.chrome && result.version >= 20) ||
					(result.samsungBrowser && result.version >= 4) ||
					(result.firefox && result.version >= 20.0) ||
					(result.safari && result.version >= 6) ||
					(result.opera && result.version >= 10.0) ||
					(result.ios && result.osversion && result.osversion.split(".")[0] >= 6) ||
					(result.blackberry && result.version >= 10.1)
					|| (result.chromium && result.version >= 20)
					) {
				  result.a = t;
				}
				else if ((result.msie && result.version < 10) ||
					(result.chrome && result.version < 20) ||
					(result.firefox && result.version < 20.0) ||
					(result.safari && result.version < 6) ||
					(result.opera && result.version < 10.0) ||
					(result.ios && result.osversion && result.osversion.split(".")[0] < 6)
					|| (result.chromium && result.version < 20)
					) {
				  result.c = t
				} else result.x = t

				return result
			  }

			  var bowser = detect(typeof navigator !== 'undefined' ? navigator.userAgent || '' : '')

			  bowser.test = function (browserList) {
				for (var i = 0; i < browserList.length; ++i) {
				  var browserItem = browserList[i];
				  if (typeof browserItem=== 'string') {
					if (browserItem in bowser) {
					  return true;
					}
				  }
				}
				return false;
			  }

			  /**
			   * Get version precisions count
			   *
			   * @example
			   *   getVersionPrecision("1.10.3") // 3
			   *
			   * @param  {string} version
			   * @return {number}
			   */
			  function getVersionPrecision(version) {
				return version.split(".").length;
			  }

			  /**
			   * Array::map polyfill
			   *
			   * @param  {Array} arr
			   * @param  {Function} iterator
			   * @return {Array}
			   */
			  function map(arr, iterator) {
				var result = [], i;
				if (Array.prototype.map) {
				  return Array.prototype.map.call(arr, iterator);
				}
				for (i = 0; i < arr.length; i++) {
				  result.push(iterator(arr[i]));
				}
				return result;
			  }

			  /**
			   * Calculate browser version weight
			   *
			   * @example
			   *   compareVersions(['1.10.2.1',  '1.8.2.1.90'])    // 1
			   *   compareVersions(['1.010.2.1', '1.09.2.1.90']);  // 1
			   *   compareVersions(['1.10.2.1',  '1.10.2.1']);     // 0
			   *   compareVersions(['1.10.2.1',  '1.0800.2']);     // -1
			   *
			   * @param  {Array<String>} versions versions to compare
			   * @return {Number} comparison result
			   */
			  function compareVersions(versions) {
				// 1) get common precision for both versions, for example for "10.0" and "9" it should be 2
				var precision = Math.max(getVersionPrecision(versions[0]), getVersionPrecision(versions[1]));
				var chunks = map(versions, function (version) {
				  var delta = precision - getVersionPrecision(version);

				  // 2) "9" -> "9.0" (for precision = 2)
				  version = version + new Array(delta + 1).join(".0");

				  // 3) "9.0" -> ["000000000"", "000000009"]
				  return map(version.split("."), function (chunk) {
					return new Array(20 - chunk.length).join("0") + chunk;
				  }).reverse();
				});

				// iterate in reverse order by reversed chunks array
				while (--precision >= 0) {
				  // 4) compare: "000000009" > "000000010" = false (but "9" > "10" = true)
				  if (chunks[0][precision] > chunks[1][precision]) {
					return 1;
				  }
				  else if (chunks[0][precision] === chunks[1][precision]) {
					if (precision === 0) {
					  // all version chunks are same
					  return 0;
					}
				  }
				  else {
					return -1;
				  }
				}
			  }

			  /**
			   * Check if browser is unsupported
			   *
			   * @example
			   *   bowser.isUnsupportedBrowser({
			   *     msie: "10",
			   *     firefox: "23",
			   *     chrome: "29",
			   *     safari: "5.1",
			   *     opera: "16",
			   *     phantom: "534"
			   *   });
			   *
			   * @param  {Object}  minVersions map of minimal version to browser
			   * @param  {Boolean} [strictMode = false] flag to return false if browser wasn't found in map
			   * @param  {String}  [ua] user agent string
			   * @return {Boolean}
			   */
			  function isUnsupportedBrowser(minVersions, strictMode, ua) {
				var _bowser = bowser;

				// make strictMode param optional with ua param usage
				if (typeof strictMode === 'string') {
				  ua = strictMode;
				  strictMode = void(0);
				}

				if (strictMode === void(0)) {
				  strictMode = false;
				}
				if (ua) {
				  _bowser = detect(ua);
				}

				var version = "" + _bowser.version;
				for (var browser in minVersions) {
				  if (minVersions.hasOwnProperty(browser)) {
					if (_bowser[browser]) {
					  if (typeof minVersions[browser] !== 'string') {
						throw new Error('Browser version in the minVersion map should be a string: ' + browser + ': ' + String(minVersions));
					  }

					  // browser version and min supported version.
					  return compareVersions([version, minVersions[browser]]) < 0;
					}
				  }
				}

				return strictMode; // not found
			  }

			  /**
			   * Check if browser is supported
			   *
			   * @param  {Object} minVersions map of minimal version to browser
			   * @param  {Boolean} [strictMode = false] flag to return false if browser wasn't found in map
			   * @param  {String}  [ua] user agent string
			   * @return {Boolean}
			   */
			  function check(minVersions, strictMode, ua) {
				return !isUnsupportedBrowser(minVersions, strictMode, ua);
			  }

			  bowser.isUnsupportedBrowser = isUnsupportedBrowser;
			  bowser.compareVersions = compareVersions;
			  bowser.check = check;

			  /*
			   * Set our detect method to the main bowser object so we can
			   * reuse it to test other user agents.
			   * This is needed to implement future tests.
			   */
			  bowser._detect = detect;

			  return bowser
			});
			//#################################################################################################

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1!=n.getDate()}],["%B",function(n){return n.getMonth()}],["%Y",zt]]),tc={range:function(n,t,e){return ao.range(Math.ceil(n/e)*e,+t,e).map(io)},floor:m,ceil:m};Ql.year=ga.year,ga.scale=function(){return ro(ao.scale.linear(),Ql,nc)};var ec=Ql.map(function(n){return[n[0].utc,n[1]]}),rc=Jl.multi([[".%L",function(n){return n.getUTCMilliseconds()}],[":%S",function(n){return n.getUTCSeconds()}],["%I:%M",function(n){return n.getUTCMinutes()}],["%I %p",function(n){return n.getUTCHours()}],["%a %d",function(n){return n.getUTCDay()&&1!=n.getUTCDate()}],["%b %d",function(n){return 1!=n.getUTCDate()}],["%B",function(n){return n.getUTCMonth()}],["%Y",zt]]);ec.year=ga.year.utc,ga.scale.utc=function(){return ro(ao.scale.linear(),ec,rc)},ao.text=An(function(n){return n.responseText}),ao.json=function(n,t){return Cn(n,"application/json",uo,t)},ao.html=function(n,t){return Cn(n,"text/html",oo,t)},ao.xml=An(function(n){return n.responseXML}),"function"==typeof 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			if (bowser.name=="Internet Explorer")
			{
			alert("OOPS! VISTOMS unfortunately does not work properly on " + bowser.name + ". Please use a different browser to see its awesome visualization features!")
			}

			function makeKadmosMenu(data)
			{
				var imageWidth = 200;
				var imageHeight = 150;
				var padding = 10;
				var rectHeight = 70;
				var imgSize = 40;
				var visPackDiv = d3.select("body").append("div").attr("class","vispackDiv");
				var visPackSvg = visPackDiv.append("svg")
					.attr("class","visPackSvg")
					.attr("width",imageWidth*5+40)
					.attr("height",imageHeight+40)
					.attr("transform", "translate("
					  + String(10) + "," + String(10) + ")")			  
				
				var visPackFrame = visPackSvg.append("rect")
					.attr("width",imageWidth*5+12)
					.attr("height",imageHeight)
					.attr("fill", "none")
				
				var imgs = visPackSvg.selectAll("image1").data([0]);
					imgs.enter()
					.append("svg:image")
					.attr("x",5)
					.attr("xlink:href", fileReference.AGILE_Logo)
					.attr("width", imageWidth)
					.attr("height", imageHeight)
					.attr("position", "relative")
					
				var imgs = visPackSvg.selectAll("image2").data([0]);
					imgs.enter()
					.append("svg:image")
					.attr("x",210)
					.attr("y",-5)
					.attr("xlink:href", fileReference.VISTOMS_Label)
					.attr("width", "180pt")
					.attr("height", "70pt")
					
					
					
				//Set general offset for Buttons, acknowledgements and so on
				var offset_tmp = 645;	
				
				
				//aigner: Make Acknowledgments, Help and Home buttons
				//##########################################################
				visPackSvg.append("rect")
				.attr("transform", "translate("+ String(offset_tmp+17) + "," + String(0) + ")")
				.attr("fill", "#555555")
				.attr("width", 140)
				.attr("height", 40)
				
				function makeButton(anId, aText,aPicFile, anOffset, aScale, picX, picY)
				{
					var buttonGroup = visPackSvg.append("a").classed("buttonGroup",true)
					buttonGroup
						.attr("class",anId)
						.append("svg:title").text(aText)
					var polygon = buttonGroup.append("polygon").classed("button",true)
						.attr("points", "30,15 22.5,28.0 7.5,28 0,15 7.5,2 22.5,2")
						.attr("transform", "translate("+ String(anOffset) + "," + String(2) + ") scale(1.2)")
					buttonGroup.append("image")
						.attr("xlink:href",aPicFile)
						.attr("height",50)
						.attr("width",50)
						.attr("transform", "translate("+ String(anOffset+picX) + "," + String(picY) + ") scale("+aScale+")")
					buttonGroup
						.on("mouseover", function()
						{
							polygon.style("fill","#3399FF")
							d3.select(this).style("cursor", "pointer")
						})
						.on("mouseleave", function()
						{
							polygon.style("fill","#555555")
						})
				}
				///Home button
				var distance = 45;
				var currentOffset = offset_tmp+25;
				makeButton("id_mainPage","Main Page",fileReference.Home, currentOffset, 0.45, 6.9,7.2);
				d3.select(".id_mainPage").on("click",function()
				{		
					mainPage();
                    dataModelScript();
				})
				//Contact button
				currentOffset+=distance;
				makeButton("id_contact","Contact the support team",fileReference.Contact, currentOffset, 0.45, 6.9, 9);
				d3.select(".id_contact").on("click",function()
				{				
					sendMail("VISTOMS support");
				})
					
				//Acknowledgements button
				currentOffset+=distance;
				makeButton("id_acknowledgements","Acknowledgements",fileReference.Acknowledgements, currentOffset, 0.45, 7, 8);
				d3.select(".id_acknowledgements").on("click",function()
				{
					acknowledgements();
                    dataModelScript();
				})
				
				//##########################################################
				
				
			
			}
			//#####################################################################//


			function getTextWidth(text, font) 
			{
				// re-use canvas object for better performance
				var canvas = getTextWidth.canvas || (getTextWidth.canvas = document.createElement("canvas"));
				var context = canvas.getContext("2d");
				context.font = font;
				var metrics = context.measureText(text);
				return metrics.width;
			}					


			//#####################################################################//
			function mainPage()
			{	
				clearView();
				var introDiv = d3.select("body").append("div")
					.attr("id","mainPage")
					.classed("wordWrap",true)
				
				var theHeading = "Welcome to <b>VISTOMS</b>, the <b>VIS</b>ualization <b>TO</b>ol for <b>M</b>DO <b>S</b>ystems!\n";
				introDiv.append("text")
				.style("font-size","16pt")
				.html(theHeading)
				
				
				introDiv.append("text")
					.style("font-size","8pt")
					.html("\n\n\nCopyright 2016-2017 by Benedikt Aigner (RWTH Aachen) & Imco van Gent (TU Delft)")
				
				var introSvg = introDiv.append("svg")
					.attr("width",500)
					.attr("height",100)
				var imgs = introSvg.selectAll("img").data([0]);
					imgs.enter()
					.append("svg:image")
					.attr("xlink:href", fileReference.RWTH_Logo)
					.attr("width", "150")
					.attr("height", "70")
					.on("mouseover", function(){d3.select(this).style("cursor", "pointer")})
					.on("click",function(){window.open("https://www.rwth-aachen.de/", '_blank');} )
				var imgs = introSvg.selectAll("img").data([0]);
					imgs.enter()
					.append("svg:image")
					.attr("xlink:href", fileReference.TUDelft_Logo)
					.attr("x", 175)
					.attr("y", 5)
					.attr("width", "105")
					.attr("height", "50")
					.on("mouseover", function(){d3.select(this).style("cursor", "pointer")})
					.on("click",function(){window.open("https://www.tudelft.nl/en/", '_blank');} )

			}
			//#####################################################################//

			//#####################################################################//
			function acknowledgements()
			{				
				clearView();
				var acknDiv = d3.select("body").append("div")
					.attr("id","acknowledgements")
					.classed("acknText", true)
					.classed("wordWrap",true)
				
				var theHeading = "Acknowledgements";
				acknDiv.append("text")
				.style("font-size","16pt")
				.html(theHeading)
				
				acknDiv.append("text")
					.style("font-size","10pt")
					.style("margin", "20px 10px")
					.html("<br><br>Created by Benedikt Aigner and Imco van Gent for the "
						+"<a href=\"http://www.agile-project.eu/\">AGILE Project</a> in 2016. This project has received funding from the European Union's Horizon 2020 research and innovation framework programme under grant agreement No 636202."
						+"<br>"
						+"<br>"
						+"<b>VISTOMS was created using the following open source packages:</b>"
						+"<br>"
						+"<a href=\"https://d3js.org/\">D3.js</a> package &copy 2015 by Mike Bostock released under the <a href=\"https://opensource.org/licenses/BSD-3-Clause\">BSD license</a>"
						+"<br>"
						+"<a href=\"https://github.com/OneraHub/XDSMjs\">XDSM.js </a> package &copy 2016 by R&eacutemi Lafage released under the <a href=\"http://www.apache.org/licenses/LICENSE-2.0\">Apache License, Version 2.0</a>"
						+"<br>"
						+"<a href=\"https://github.com/Neilos/bihisankey\">BiHiSankey.js</a> package &copy 2015 by Neil Atkinson released under the <a href=\"https://opensource.org/licenses/MIT\">MIT License</a>"
						+"<br>"
						+"<br>"
						+"<br>"
						+"<font size=\"-2\">Rev. 07/31/2017</font>")
			}
			//#####################################################################//			
			//aigner: Send mail function
			//#####################################################################//
			function sendMail(mailText) 
			{
				var link = "mailto:support@agile-project.eu"
				window.location.href = link;
			}
			//#####################################################################//
			
			//aigner: Load entire MDO data
			//###############################################################################################################################################################################################################//
			//#####################################################################//
			//#####################################################################//
			//@Imco: here the references to all files are done
			var fileReference = {
				Acknowledgements : "REP__Acknowledgements__REP",
				AGILE_Icon : "REP__AGILE_Icon__REP",
				AGILE_Logo : "REP__AGILE_Logo__REP",
				Contact : "REP__Contact__REP",
				Home: "REP__Home__REP",
				RWTH_Logo : "REP__RWTH_Logo__REP",
				TUDelft_Logo : "REP__TUDelft_Logo__REP",
				Tutorial : "REP__Tutorial__REP",
				VISTOMS_Label : "REP__VISTOMS_Label__REP",
			}
			
			//@Imco: Here is the sellar problem example data
            //the "modelName" could for instance be the name of the CPACS XML file or the modelUID in the CPACS file
            //the "schema" is just the variable categorization according to the CPACS schema that we always had. 
			theData = REP__GRAPH_DATA__REP
			function loadAllData(data)
			{
				makeKadmosMenu(data);
				mainPage();
                dataModelScript();
			}
			loadAllData(theData);
			//#####################################################################//
			//#####################################################################//
			//###############################################################################################################################################################################################################//
			
			//aigner: Clear view function
			//#####################################################################//
			function clearView()
			{
				var visualizationScript = d3.select(".visualizationScript");
				if (visualizationScript){visualizationScript.remove();}
				var mainPage = document.getElementById("mainPage");
                var xdsm = d3.select(".modelViewerDiv");							
				if (xdsm){xdsm.remove();}
				if (mainPage){mainPage.remove();}
				var ackn = document.getElementById("acknowledgements");
				if (ackn){ackn.remove();}
			}
			//#####################################################################//
		
            function dataModelScript()
            {
                (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
                // https://d3js.org Version 4.3.0. Copyright 2016 Mike Bostock.
                (function (global, factory) {
                  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
                  typeof define === 'function' && define.amd ? define(['exports'], factory) :
                  (factory((global.d3 = global.d3 || {})));
                }(this, (function (exports) { 'use strict';

                var version = "4.3.0";

                var ascending = function(a, b) {
                  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
                };

                var bisector = function(compare) {
                  if (compare.length === 1) compare = ascendingComparator(compare);
                  return {
                    left: function(a, x, lo, hi) {
                      if (lo == null) lo = 0;
                      if (hi == null) hi = a.length;
                      while (lo < hi) {
                        var mid = lo + hi >>> 1;
                        if (compare(a[mid], x) < 0) lo = mid + 1;
                        else hi = mid;
                      }
                      return lo;
                    },
                    right: function(a, x, lo, hi) {
                      if (lo == null) lo = 0;
                      if (hi == null) hi = a.length;
                      while (lo < hi) {
                        var mid = lo + hi >>> 1;
                        if (compare(a[mid], x) > 0) hi = mid;
                        else lo = mid + 1;
                      }
                      return lo;
                    }
                  };
                };

                function ascendingComparator(f) {
                  return function(d, x) {
                    return ascending(f(d), x);
                  };
                }

                var ascendingBisect = bisector(ascending);
                var bisectRight = ascendingBisect.right;
                var bisectLeft = ascendingBisect.left;

                var descending = function(a, b) {
                  return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
                };

                var number = function(x) {
                  return x === null ? NaN : +x;
                };

                var variance = function(array, f) {
                  var n = array.length,
                      m = 0,
                      a,
                      d,
                      s = 0,
                      i = -1,
                      j = 0;

                  if (f == null) {
                    while (++i < n) {
                      if (!isNaN(a = number(array[i]))) {
                        d = a - m;
                        m += d / ++j;
                        s += d * (a - m);
                      }
                    }
                  }

                  else {
                    while (++i < n) {
                      if (!isNaN(a = number(f(array[i], i, array)))) {
                        d = a - m;
                        m += d / ++j;
                        s += d * (a - m);
                      }
                    }
                  }

                  if (j > 1) return s / (j - 1);
                };

                var deviation = function(array, f) {
                  var v = variance(array, f);
                  return v ? Math.sqrt(v) : v;
                };

                var extent = function(array, f) {
                  var i = -1,
                      n = array.length,
                      a,
                      b,
                      c;

                  if (f == null) {
                    while (++i < n) if ((b = array[i]) != null && b >= b) { a = c = b; break; }
                    while (++i < n) if ((b = array[i]) != null) {
                      if (a > b) a = b;
                      if (c < b) c = b;
                    }
                  }

                  else {
                    while (++i < n) if ((b = f(array[i], i, array)) != null && b >= b) { a = c = b; break; }
                    while (++i < n) if ((b = f(array[i], i, array)) != null) {
                      if (a > b) a = b;
                      if (c < b) c = b;
                    }
                  }

                  return [a, c];
                };

                var array = Array.prototype;

                var slice = array.slice;
                var map = array.map;

                var constant$1 = function(x) {
                  return function() {
                    return x;
                  };
                };

                var identity = function(x) {
                  return x;
                };

                var range = function(start, stop, step) {
                  start = +start, stop = +stop, step = (n = arguments.length) < 2 ? (stop = start, start = 0, 1) : n < 3 ? 1 : +step;

                  var i = -1,
                      n = Math.max(0, Math.ceil((stop - start) / step)) | 0,
                      range = new Array(n);

                  while (++i < n) {
                    range[i] = start + i * step;
                  }

                  return range;
                };

                var e10 = Math.sqrt(50);
                var e5 = Math.sqrt(10);
                var e2 = Math.sqrt(2);

                var ticks = function(start, stop, count) {
                  var step = tickStep(start, stop, count);
                  return range(
                    Math.ceil(start / step) * step,
                    Math.floor(stop / step) * step + step / 2, // inclusive
                    step
                  );
                };

                function tickStep(start, stop, count) {
                  var step0 = Math.abs(stop - start) / Math.max(0, count),
                      step1 = Math.pow(10, Math.floor(Math.log(step0) / Math.LN10)),
                      error = step0 / step1;
                  if (error >= e10) step1 *= 10;
                  else if (error >= e5) step1 *= 5;
                  else if (error >= e2) step1 *= 2;
                  return stop < start ? -step1 : step1;
                }

                var sturges = function(values) {
                  return Math.ceil(Math.log(values.length) / Math.LN2) + 1;
                };

                var histogram = function() {
                  var value = identity,
                      domain = extent,
                      threshold = sturges;

                  function histogram(data) {
                    var i,
                        n = data.length,
                        x,
                        values = new Array(n);

                    for (i = 0; i < n; ++i) {
                      values[i] = value(data[i], i, data);
                    }

                    var xz = domain(values),
                        x0 = xz[0],
                        x1 = xz[1],
                        tz = threshold(values, x0, x1);

                    // Convert number of thresholds into uniform thresholds.
                    if (!Array.isArray(tz)) tz = ticks(x0, x1, tz);

                    // Remove any thresholds outside the domain.
                    var m = tz.length;
                    while (tz[0] <= x0) tz.shift(), --m;
                    while (tz[m - 1] >= x1) tz.pop(), --m;

                    var bins = new Array(m + 1),
                        bin;

                    // Initialize bins.
                    for (i = 0; i <= m; ++i) {
                      bin = bins[i] = [];
                      bin.x0 = i > 0 ? tz[i - 1] : x0;
                      bin.x1 = i < m ? tz[i] : x1;
                    }

                    // Assign data to bins by value, ignoring any outside the domain.
                    for (i = 0; i < n; ++i) {
                      x = values[i];
                      if (x0 <= x && x <= x1) {
                        bins[bisectRight(tz, x, 0, m)].push(data[i]);
                      }
                    }

                    return bins;
                  }

                  histogram.value = function(_) {
                    return arguments.length ? (value = typeof _ === "function" ? _ : constant$1(_), histogram) : value;
                  };

                  histogram.domain = function(_) {
                    return arguments.length ? (domain = typeof _ === "function" ? _ : constant$1([_[0], _[1]]), histogram) : domain;
                  };

                  histogram.thresholds = function(_) {
                    return arguments.length ? (threshold = typeof _ === "function" ? _ : Array.isArray(_) ? constant$1(slice.call(_)) : constant$1(_), histogram) : threshold;
                  };

                  return histogram;
                };

                var threshold = function(array, p, f) {
                  if (f == null) f = number;
                  if (!(n = array.length)) return;
                  if ((p = +p) <= 0 || n < 2) return +f(array[0], 0, array);
                  if (p >= 1) return +f(array[n - 1], n - 1, array);
                  var n,
                      h = (n - 1) * p,
                      i = Math.floor(h),
                      a = +f(array[i], i, array),
                      b = +f(array[i + 1], i + 1, array);
                  return a + (b - a) * (h - i);
                };

                var freedmanDiaconis = function(values, min, max) {
                  values = map.call(values, number).sort(ascending);
                  return Math.ceil((max - min) / (2 * (threshold(values, 0.75) - threshold(values, 0.25)) * Math.pow(values.length, -1 / 3)));
                };

                var scott = function(values, min, max) {
                  return Math.ceil((max - min) / (3.5 * deviation(values) * Math.pow(values.length, -1 / 3)));
                };

                var max = function(array, f) {
                  var i = -1,
                      n = array.length,
                      a,
                      b;

                  if (f == null) {
                    while (++i < n) if ((b = array[i]) != null && b >= b) { a = b; break; }
                    while (++i < n) if ((b = array[i]) != null && b > a) a = b;
                  }

                  else {
                    while (++i < n) if ((b = f(array[i], i, array)) != null && b >= b) { a = b; break; }
                    while (++i < n) if ((b = f(array[i], i, array)) != null && b > a) a = b;
                  }

                  return a;
                };

                var mean = function(array, f) {
                  var s = 0,
                      n = array.length,
                      a,
                      i = -1,
                      j = n;

                  if (f == null) {
                    while (++i < n) if (!isNaN(a = number(array[i]))) s += a; else --j;
                  }

                  else {
                    while (++i < n) if (!isNaN(a = number(f(array[i], i, array)))) s += a; else --j;
                  }

                  if (j) return s / j;
                };

                var median = function(array, f) {
                  var numbers = [],
                      n = array.length,
                      a,
                      i = -1;

                  if (f == null) {
                    while (++i < n) if (!isNaN(a = number(array[i]))) numbers.push(a);
                  }

                  else {
                    while (++i < n) if (!isNaN(a = number(f(array[i], i, array)))) numbers.push(a);
                  }

                  return threshold(numbers.sort(ascending), 0.5);
                };

                var merge = function(arrays) {
                  var n = arrays.length,
                      m,
                      i = -1,
                      j = 0,
                      merged,
                      array;

                  while (++i < n) j += arrays[i].length;
                  merged = new Array(j);

                  while (--n >= 0) {
                    array = arrays[n];
                    m = array.length;
                    while (--m >= 0) {
                      merged[--j] = array[m];
                    }
                  }

                  return merged;
                };

                var min = function(array, f) {
                  var i = -1,
                      n = array.length,
                      a,
                      b;

                  if (f == null) {
                    while (++i < n) if ((b = array[i]) != null && b >= b) { a = b; break; }
                    while (++i < n) if ((b = array[i]) != null && a > b) a = b;
                  }

                  else {
                    while (++i < n) if ((b = f(array[i], i, array)) != null && b >= b) { a = b; break; }
                    while (++i < n) if ((b = f(array[i], i, array)) != null && a > b) a = b;
                  }

                  return a;
                };

                var pairs = function(array) {
                  var i = 0, n = array.length - 1, p = array[0], pairs = new Array(n < 0 ? 0 : n);
                  while (i < n) pairs[i] = [p, p = array[++i]];
                  return pairs;
                };

                var permute = function(array, indexes) {
                  var i = indexes.length, permutes = new Array(i);
                  while (i--) permutes[i] = array[indexes[i]];
                  return permutes;
                };

                var scan = function(array, compare) {
                  if (!(n = array.length)) return;
                  var i = 0,
                      n,
                      j = 0,
                      xi,
                      xj = array[j];

                  if (!compare) compare = ascending;

                  while (++i < n) if (compare(xi = array[i], xj) < 0 || compare(xj, xj) !== 0) xj = xi, j = i;

                  if (compare(xj, xj) === 0) return j;
                };

                var shuffle = function(array, i0, i1) {
                  var m = (i1 == null ? array.length : i1) - (i0 = i0 == null ? 0 : +i0),
                      t,
                      i;

                  while (m) {
                    i = Math.random() * m-- | 0;
                    t = array[m + i0];
                    array[m + i0] = array[i + i0];
                    array[i + i0] = t;
                  }

                  return array;
                };

                var sum = function(array, f) {
                  var s = 0,
                      n = array.length,
                      a,
                      i = -1;

                  if (f == null) {
                    while (++i < n) if (a = +array[i]) s += a; // Note: zero and null are equivalent.
                  }

                  else {
                    while (++i < n) if (a = +f(array[i], i, array)) s += a;
                  }

                  return s;
                };

                var transpose = function(matrix) {
                  if (!(n = matrix.length)) return [];
                  for (var i = -1, m = min(matrix, length), transpose = new Array(m); ++i < m;) {
                    for (var j = -1, n, row = transpose[i] = new Array(n); ++j < n;) {
                      row[j] = matrix[j][i];
                    }
                  }
                  return transpose;
                };

                function length(d) {
                  return d.length;
                }

                var zip = function() {
                  return transpose(arguments);
                };

                var prefix = "$";

                function Map() {}

                Map.prototype = map$1.prototype = {
                  constructor: Map,
                  has: function(key) {
                    return (prefix + key) in this;
                  },
                  get: function(key) {
                    return this[prefix + key];
                  },
                  set: function(key, value) {
                    this[prefix + key] = value;
                    return this;
                  },
                  remove: function(key) {
                    var property = prefix + key;
                    return property in this && delete this[property];
                  },
                  clear: function() {
                    for (var property in this) if (property[0] === prefix) delete this[property];
                  },
                  keys: function() {
                    var keys = [];
                    for (var property in this) if (property[0] === prefix) keys.push(property.slice(1));
                    return keys;
                  },
                  values: function() {
                    var values = [];
                    for (var property in this) if (property[0] === prefix) values.push(this[property]);
                    return values;
                  },
                  entries: function() {
                    var entries = [];
                    for (var property in this) if (property[0] === prefix) entries.push({key: property.slice(1), value: this[property]});
                    return entries;
                  },
                  size: function() {
                    var size = 0;
                    for (var property in this) if (property[0] === prefix) ++size;
                    return size;
                  },
                  empty: function() {
                    for (var property in this) if (property[0] === prefix) return false;
                    return true;
                  },
                  each: function(f) {
                    for (var property in this) if (property[0] === prefix) f(this[property], property.slice(1), this);
                  }
                };

                function map$1(object, f) {
                  var map = new Map;

                  // Copy constructor.
                  if (object instanceof Map) object.each(function(value, key) { map.set(key, value); });

                  // Index array by numeric index or specified key function.
                  else if (Array.isArray(object)) {
                    var i = -1,
                        n = object.length,
                        o;

                    if (f == null) while (++i < n) map.set(i, object[i]);
                    else while (++i < n) map.set(f(o = object[i], i, object), o);
                  }

                  // Convert object to map.
                  else if (object) for (var key in object) map.set(key, object[key]);

                  return map;
                }

                var nest = function() {
                  var keys = [],
                      sortKeys = [],
                      sortValues,
                      rollup,
                      nest;

                  function apply(array, depth, createResult, setResult) {
                    if (depth >= keys.length) return rollup != null
                        ? rollup(array) : (sortValues != null
                        ? array.sort(sortValues)
                        : array);

                    var i = -1,
                        n = array.length,
                        key = keys[depth++],
                        keyValue,
                        value,
                        valuesByKey = map$1(),
                        values,
                        result = createResult();

                    while (++i < n) {
                      if (values = valuesByKey.get(keyValue = key(value = array[i]) + "")) {
                        values.push(value);
                      } else {
                        valuesByKey.set(keyValue, [value]);
                      }
                    }

                    valuesByKey.each(function(values, key) {
                      setResult(result, key, apply(values, depth, createResult, setResult));
                    });

                    return result;
                  }

                  function entries(map, depth) {
                    if (++depth > keys.length) return map;
                    var array, sortKey = sortKeys[depth - 1];
                    if (rollup != null && depth >= keys.length) array = map.entries();
                    else array = [], map.each(function(v, k) { array.push({key: k, values: entries(v, depth)}); });
                    return sortKey != null ? array.sort(function(a, b) { return sortKey(a.key, b.key); }) : array;
                  }

                  return nest = {
                    object: function(array) { return apply(array, 0, createObject, setObject); },
                    map: function(array) { return apply(array, 0, createMap, setMap); },
                    entries: function(array) { return entries(apply(array, 0, createMap, setMap), 0); },
                    key: function(d) { keys.push(d); return nest; },
                    sortKeys: function(order) { sortKeys[keys.length - 1] = order; return nest; },
                    sortValues: function(order) { sortValues = order; return nest; },
                    rollup: function(f) { rollup = f; return nest; }
                  };
                };

                function createObject() {
                  return {};
                }

                function setObject(object, key, value) {
                  object[key] = value;
                }

                function createMap() {
                  return map$1();
                }

                function setMap(map, key, value) {
                  map.set(key, value);
                }

                function Set() {}

                var proto = map$1.prototype;

                Set.prototype = set.prototype = {
                  constructor: Set,
                  has: proto.has,
                  add: function(value) {
                    value += "";
                    this[prefix + value] = value;
                    return this;
                  },
                  remove: proto.remove,
                  clear: proto.clear,
                  values: proto.keys,
                  size: proto.size,
                  empty: proto.empty,
                  each: proto.each
                };

                function set(object, f) {
                  var set = new Set;

                  // Copy constructor.
                  if (object instanceof Set) object.each(function(value) { set.add(value); });

                  // Otherwise, assume it’s an array.
                  else if (object) {
                    var i = -1, n = object.length;
                    if (f == null) while (++i < n) set.add(object[i]);
                    else while (++i < n) set.add(f(object[i], i, object));
                  }

                  return set;
                }

                var keys = function(map) {
                  var keys = [];
                  for (var key in map) keys.push(key);
                  return keys;
                };

                var values = function(map) {
                  var values = [];
                  for (var key in map) values.push(map[key]);
                  return values;
                };

                var entries = function(map) {
                  var entries = [];
                  for (var key in map) entries.push({key: key, value: map[key]});
                  return entries;
                };

                var uniform = function(min, max) {
                  min = min == null ? 0 : +min;
                  max = max == null ? 1 : +max;
                  if (arguments.length === 1) max = min, min = 0;
                  else max -= min;
                  return function() {
                    return Math.random() * max + min;
                  };
                };

                var normal = function(mu, sigma) {
                  var x, r;
                  mu = mu == null ? 0 : +mu;
                  sigma = sigma == null ? 1 : +sigma;
                  return function() {
                    var y;

                    // If available, use the second previously-generated uniform random.
                    if (x != null) y = x, x = null;

                    // Otherwise, generate a new x and y.
                    else do {
                      x = Math.random() * 2 - 1;
                      y = Math.random() * 2 - 1;
                      r = x * x + y * y;
                    } while (!r || r > 1);

                    return mu + sigma * y * Math.sqrt(-2 * Math.log(r) / r);
                  };
                };

                var logNormal = function() {
                  var randomNormal = normal.apply(this, arguments);
                  return function() {
                    return Math.exp(randomNormal());
                  };
                };

                var irwinHall = function(n) {
                  return function() {
                    for (var sum = 0, i = 0; i < n; ++i) sum += Math.random();
                    return sum;
                  };
                };

                var bates = function(n) {
                  var randomIrwinHall = irwinHall(n);
                  return function() {
                    return randomIrwinHall() / n;
                  };
                };

                var exponential = function(lambda) {
                  return function() {
                    return -Math.log(1 - Math.random()) / lambda;
                  };
                };

                function linear(t) {
                  return +t;
                }

                function quadIn(t) {
                  return t * t;
                }

                function quadOut(t) {
                  return t * (2 - t);
                }

                function quadInOut(t) {
                  return ((t *= 2) <= 1 ? t * t : --t * (2 - t) + 1) / 2;
                }

                function cubicIn(t) {
                  return t * t * t;
                }

                function cubicOut(t) {
                  return --t * t * t + 1;
                }

                function cubicInOut(t) {
                  return ((t *= 2) <= 1 ? t * t * t : (t -= 2) * t * t + 2) / 2;
                }

                var exponent = 3;

                var polyIn = (function custom(e) {
                  e = +e;

                  function polyIn(t) {
                    return Math.pow(t, e);
                  }

                  polyIn.exponent = custom;

                  return polyIn;
                })(exponent);

                var polyOut = (function custom(e) {
                  e = +e;

                  function polyOut(t) {
                    return 1 - Math.pow(1 - t, e);
                  }

                  polyOut.exponent = custom;

                  return polyOut;
                })(exponent);

                var polyInOut = (function custom(e) {
                  e = +e;

                  function polyInOut(t) {
                    return ((t *= 2) <= 1 ? Math.pow(t, e) : 2 - Math.pow(2 - t, e)) / 2;
                  }

                  polyInOut.exponent = custom;

                  return polyInOut;
                })(exponent);

                var pi = Math.PI;
                var halfPi = pi / 2;

                function sinIn(t) {
                  return 1 - Math.cos(t * halfPi);
                }

                function sinOut(t) {
                  return Math.sin(t * halfPi);
                }

                function sinInOut(t) {
                  return (1 - Math.cos(pi * t)) / 2;
                }

                function expIn(t) {
                  return Math.pow(2, 10 * t - 10);
                }

                function expOut(t) {
                  return 1 - Math.pow(2, -10 * t);
                }

                function expInOut(t) {
                  return ((t *= 2) <= 1 ? Math.pow(2, 10 * t - 10) : 2 - Math.pow(2, 10 - 10 * t)) / 2;
                }

                function circleIn(t) {
                  return 1 - Math.sqrt(1 - t * t);
                }

                function circleOut(t) {
                  return Math.sqrt(1 - --t * t);
                }

                function circleInOut(t) {
                  return ((t *= 2) <= 1 ? 1 - Math.sqrt(1 - t * t) : Math.sqrt(1 - (t -= 2) * t) + 1) / 2;
                }

                var b1 = 4 / 11;
                var b2 = 6 / 11;
                var b3 = 8 / 11;
                var b4 = 3 / 4;
                var b5 = 9 / 11;
                var b6 = 10 / 11;
                var b7 = 15 / 16;
                var b8 = 21 / 22;
                var b9 = 63 / 64;
                var b0 = 1 / b1 / b1;

                function bounceIn(t) {
                  return 1 - bounceOut(1 - t);
                }

                function bounceOut(t) {
                  return (t = +t) < b1 ? b0 * t * t : t < b3 ? b0 * (t -= b2) * t + b4 : t < b6 ? b0 * (t -= b5) * t + b7 : b0 * (t -= b8) * t + b9;
                }

                function bounceInOut(t) {
                  return ((t *= 2) <= 1 ? 1 - bounceOut(1 - t) : bounceOut(t - 1) + 1) / 2;
                }

                var overshoot = 1.70158;

                var backIn = (function custom(s) {
                  s = +s;

                  function backIn(t) {
                    return t * t * ((s + 1) * t - s);
                  }

                  backIn.overshoot = custom;

                  return backIn;
                })(overshoot);

                var backOut = (function custom(s) {
                  s = +s;

                  function backOut(t) {
                    return --t * t * ((s + 1) * t + s) + 1;
                  }

                  backOut.overshoot = custom;

                  return backOut;
                })(overshoot);

                var backInOut = (function custom(s) {
                  s = +s;

                  function backInOut(t) {
                    return ((t *= 2) < 1 ? t * t * ((s + 1) * t - s) : (t -= 2) * t * ((s + 1) * t + s) + 2) / 2;
                  }

                  backInOut.overshoot = custom;

                  return backInOut;
                })(overshoot);

                var tau = 2 * Math.PI;
                var amplitude = 1;
                var period = 0.3;

                var elasticIn = (function custom(a, p) {
                  var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);

                  function elasticIn(t) {
                    return a * Math.pow(2, 10 * --t) * Math.sin((s - t) / p);
                  }

                  elasticIn.amplitude = function(a) { return custom(a, p * tau); };
                  elasticIn.period = function(p) { return custom(a, p); };

                  return elasticIn;
                })(amplitude, period);

                var elasticOut = (function custom(a, p) {
                  var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);

                  function elasticOut(t) {
                    return 1 - a * Math.pow(2, -10 * (t = +t)) * Math.sin((t + s) / p);
                  }

                  elasticOut.amplitude = function(a) { return custom(a, p * tau); };
                  elasticOut.period = function(p) { return custom(a, p); };

                  return elasticOut;
                })(amplitude, period);

                var elasticInOut = (function custom(a, p) {
                  var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);

                  function elasticInOut(t) {
                    return ((t = t * 2 - 1) < 0
                        ? a * Math.pow(2, 10 * t) * Math.sin((s - t) / p)
                        : 2 - a * Math.pow(2, -10 * t) * Math.sin((s + t) / p)) / 2;
                  }

                  elasticInOut.amplitude = function(a) { return custom(a, p * tau); };
                  elasticInOut.period = function(p) { return custom(a, p); };

                  return elasticInOut;
                })(amplitude, period);

                var area = function(polygon) {
                  var i = -1,
                      n = polygon.length,
                      a,
                      b = polygon[n - 1],
                      area = 0;

                  while (++i < n) {
                    a = b;
                    b = polygon[i];
                    area += a[1] * b[0] - a[0] * b[1];
                  }

                  return area / 2;
                };

                var centroid = function(polygon) {
                  var i = -1,
                      n = polygon.length,
                      x = 0,
                      y = 0,
                      a,
                      b = polygon[n - 1],
                      c,
                      k = 0;

                  while (++i < n) {
                    a = b;
                    b = polygon[i];
                    k += c = a[0] * b[1] - b[0] * a[1];
                    x += (a[0] + b[0]) * c;
                    y += (a[1] + b[1]) * c;
                  }

                  return k *= 3, [x / k, y / k];
                };

                // Returns the 2D cross product of AB and AC vectors, i.e., the z-component of
                // the 3D cross product in a quadrant I Cartesian coordinate system (+x is
                // right, +y is up). Returns a positive value if ABC is counter-clockwise,
                // negative if clockwise, and zero if the points are collinear.
                var cross = function(a, b, c) {
                  return (b[0] - a[0]) * (c[1] - a[1]) - (b[1] - a[1]) * (c[0] - a[0]);
                };

                function lexicographicOrder(a, b) {
                  return a[0] - b[0] || a[1] - b[1];
                }

                // Computes the upper convex hull per the monotone chain algorithm.
                // Assumes points.length >= 3, is sorted by x, unique in y.
                // Returns an array of indices into points in left-to-right order.
                function computeUpperHullIndexes(points) {
                  var n = points.length,
                      indexes = [0, 1],
                      size = 2;

                  for (var i = 2; i < n; ++i) {
                    while (size > 1 && cross(points[indexes[size - 2]], points[indexes[size - 1]], points[i]) <= 0) --size;
                    indexes[size++] = i;
                  }

                  return indexes.slice(0, size); // remove popped points
                }

                var hull = function(points) {
                  if ((n = points.length) < 3) return null;

                  var i,
                      n,
                      sortedPoints = new Array(n),
                      flippedPoints = new Array(n);

                  for (i = 0; i < n; ++i) sortedPoints[i] = [+points[i][0], +points[i][1], i];
                  sortedPoints.sort(lexicographicOrder);
                  for (i = 0; i < n; ++i) flippedPoints[i] = [sortedPoints[i][0], -sortedPoints[i][1]];

                  var upperIndexes = computeUpperHullIndexes(sortedPoints),
                      lowerIndexes = computeUpperHullIndexes(flippedPoints);

                  // Construct the hull polygon, removing possible duplicate endpoints.
                  var skipLeft = lowerIndexes[0] === upperIndexes[0],
                      skipRight = lowerIndexes[lowerIndexes.length - 1] === upperIndexes[upperIndexes.length - 1],
                      hull = [];

                  // Add upper hull in right-to-l order.
                  // Then add lower hull in left-to-right order.
                  for (i = upperIndexes.length - 1; i >= 0; --i) hull.push(points[sortedPoints[upperIndexes[i]][2]]);
                  for (i = +skipLeft; i < lowerIndexes.length - skipRight; ++i) hull.push(points[sortedPoints[lowerIndexes[i]][2]]);

                  return hull;
                };

                var contains = function(polygon, point) {
                  var n = polygon.length,
                      p = polygon[n - 1],
                      x = point[0], y = point[1],
                      x0 = p[0], y0 = p[1],
                      x1, y1,
                      inside = false;

                  for (var i = 0; i < n; ++i) {
                    p = polygon[i], x1 = p[0], y1 = p[1];
                    if (((y1 > y) !== (y0 > y)) && (x < (x0 - x1) * (y - y1) / (y0 - y1) + x1)) inside = !inside;
                    x0 = x1, y0 = y1;
                  }

                  return inside;
                };

                var length$1 = function(polygon) {
                  var i = -1,
                      n = polygon.length,
                      b = polygon[n - 1],
                      xa,
                      ya,
                      xb = b[0],
                      yb = b[1],
                      perimeter = 0;

                  while (++i < n) {
                    xa = xb;
                    ya = yb;
                    b = polygon[i];
                    xb = b[0];
                    yb = b[1];
                    xa -= xb;
                    ya -= yb;
                    perimeter += Math.sqrt(xa * xa + ya * ya);
                  }

                  return perimeter;
                };

                var pi$1 = Math.PI;
                var tau$1 = 2 * pi$1;
                var epsilon = 1e-6;
                var tauEpsilon = tau$1 - epsilon;

                function Path() {
                  this._x0 = this._y0 = // start of current subpath
                  this._x1 = this._y1 = null; // end of current subpath
                  this._ = [];
                }

                function path() {
                  return new Path;
                }

                Path.prototype = path.prototype = {
                  constructor: Path,
                  moveTo: function(x, y) {
                    this._.push("M", this._x0 = this._x1 = +x, ",", this._y0 = this._y1 = +y);
                  },
                  closePath: function() {
                    if (this._x1 !== null) {
                      this._x1 = this._x0, this._y1 = this._y0;
                      this._.push("Z");
                    }
                  },
                  lineTo: function(x, y) {
                    this._.push("L", this._x1 = +x, ",", this._y1 = +y);
                  },
                  quadraticCurveTo: function(x1, y1, x, y) {
                    this._.push("Q", +x1, ",", +y1, ",", this._x1 = +x, ",", this._y1 = +y);
                  },
                  bezierCurveTo: function(x1, y1, x2, y2, x, y) {
                    this._.push("C", +x1, ",", +y1, ",", +x2, ",", +y2, ",", this._x1 = +x, ",", this._y1 = +y);
                  },
                  arcTo: function(x1, y1, x2, y2, r) {
                    x1 = +x1, y1 = +y1, x2 = +x2, y2 = +y2, r = +r;
                    var x0 = this._x1,
                        y0 = this._y1,
                        x21 = x2 - x1,
                        y21 = y2 - y1,
                        x01 = x0 - x1,
                        y01 = y0 - y1,
                        l01_2 = x01 * x01 + y01 * y01;

                    // Is the radius negative? Error.
                    if (r < 0) throw new Error("negative radius: " + r);

                    // Is this path empty? Move to (x1,y1).
                    if (this._x1 === null) {
                      this._.push(
                        "M", this._x1 = x1, ",", this._y1 = y1
                      );
                    }

                    // Or, is (x1,y1) coincident with (x0,y0)? Do nothing.
                    else if (!(l01_2 > epsilon)) {}

                    // Or, are (x0,y0), (x1,y1) and (x2,y2) collinear?
                    // Equivalently, is (x1,y1) coincident with (x2,y2)?
                    // Or, is the radius zero? Line to (x1,y1).
                    else if (!(Math.abs(y01 * x21 - y21 * x01) > epsilon) || !r) {
                      this._.push(
                        "L", this._x1 = x1, ",", this._y1 = y1
                      );
                    }

                    // Otherwise, draw an arc!
                    else {
                      var x20 = x2 - x0,
                          y20 = y2 - y0,
                          l21_2 = x21 * x21 + y21 * y21,
                          l20_2 = x20 * x20 + y20 * y20,
                          l21 = Math.sqrt(l21_2),
                          l01 = Math.sqrt(l01_2),
                          l = r * Math.tan((pi$1 - Math.acos((l21_2 + l01_2 - l20_2) / (2 * l21 * l01))) / 2),
                          t01 = l / l01,
                          t21 = l / l21;

                      // If the start tangent is not coincident with (x0,y0), line to.
                      if (Math.abs(t01 - 1) > epsilon) {
                        this._.push(
                          "L", x1 + t01 * x01, ",", y1 + t01 * y01
                        );
                      }

                      this._.push(
                        "A", r, ",", r, ",0,0,", +(y01 * x20 > x01 * y20), ",", this._x1 = x1 + t21 * x21, ",", this._y1 = y1 + t21 * y21
                      );
                    }
                  },
                  arc: function(x, y, r, a0, a1, ccw) {
                    x = +x, y = +y, r = +r;
                    var dx = r * Math.cos(a0),
                        dy = r * Math.sin(a0),
                        x0 = x + dx,
                        y0 = y + dy,
                        cw = 1 ^ ccw,
                        da = ccw ? a0 - a1 : a1 - a0;

                    // Is the radius negative? Error.
                    if (r < 0) throw new Error("negative radius: " + r);

                    // Is this path empty? Move to (x0,y0).
                    if (this._x1 === null) {
                      this._.push(
                        "M", x0, ",", y0
                      );
                    }

                    // Or, is (x0,y0) not coincident with the previous point? Line to (x0,y0).
                    else if (Math.abs(this._x1 - x0) > epsilon || Math.abs(this._y1 - y0) > epsilon) {
                      this._.push(
                        "L", x0, ",", y0
                      );
                    }

                    // Is this arc empty? We’re done.
                    if (!r) return;

                    // Is this a complete circle? Draw two arcs to complete the circle.
                    if (da > tauEpsilon) {
                      this._.push(
                        "A", r, ",", r, ",0,1,", cw, ",", x - dx, ",", y - dy,
                        "A", r, ",", r, ",0,1,", cw, ",", this._x1 = x0, ",", this._y1 = y0
                      );
                    }

                    // Otherwise, draw an arc!
                    else {
                      if (da < 0) da = da % tau$1 + tau$1;
                      this._.push(
                        "A", r, ",", r, ",0,", +(da >= pi$1), ",", cw, ",", this._x1 = x + r * Math.cos(a1), ",", this._y1 = y + r * Math.sin(a1)
                      );
                    }
                  },
                  rect: function(x, y, w, h) {
                    this._.push("M", this._x0 = this._x1 = +x, ",", this._y0 = this._y1 = +y, "h", +w, "v", +h, "h", -w, "Z");
                  },
                  toString: function() {
                    return this._.join("");
                  }
                };

                var tree_add = function(d) {
                  var x = +this._x.call(null, d),
                      y = +this._y.call(null, d);
                  return add(this.cover(x, y), x, y, d);
                };

                function add(tree, x, y, d) {
                  if (isNaN(x) || isNaN(y)) return tree; // ignore invalid points

                  var parent,
                      node = tree._root,
                      leaf = {data: d},
                      x0 = tree._x0,
                      y0 = tree._y0,
                      x1 = tree._x1,
                      y1 = tree._y1,
                      xm,
                      ym,
                      xp,
                      yp,
                      right,
                      bottom,
                      i,
                      j;

                  // If the tree is empty, initialize the root as a leaf.
                  if (!node) return tree._root = leaf, tree;

                  // Find the existing leaf for the new point, or add it.
                  while (node.length) {
                    if (right = x >= (xm = (x0 + x1) / 2)) x0 = xm; else x1 = xm;
                    if (bottom = y >= (ym = (y0 + y1) / 2)) y0 = ym; else y1 = ym;
                    if (parent = node, !(node = node[i = bottom << 1 | right])) return parent[i] = leaf, tree;
                  }

                  // Is the new point is exactly coincident with the existing point?
                  xp = +tree._x.call(null, node.data);
                  yp = +tree._y.call(null, node.data);
                  if (x === xp && y === yp) return leaf.next = node, parent ? parent[i] = leaf : tree._root = leaf, tree;

                  // Otherwise, split the leaf node until the old and new point are separated.
                  do {
                    parent = parent ? parent[i] = new Array(4) : tree._root = new Array(4);
                    if (right = x >= (xm = (x0 + x1) / 2)) x0 = xm; else x1 = xm;
                    if (bottom = y >= (ym = (y0 + y1) / 2)) y0 = ym; else y1 = ym;
                  } while ((i = bottom << 1 | right) === (j = (yp >= ym) << 1 | (xp >= xm)));
                  return parent[j] = node, parent[i] = leaf, tree;
                }

                function addAll(data) {
                  var d, i, n = data.length,
                      x,
                      y,
                      xz = new Array(n),
                      yz = new Array(n),
                      x0 = Infinity,
                      y0 = Infinity,
                      x1 = -Infinity,
                      y1 = -Infinity;

                  // Compute the points and their extent.
                  for (i = 0; i < n; ++i) {
                    if (isNaN(x = +this._x.call(null, d = data[i])) || isNaN(y = +this._y.call(null, d))) continue;
                    xz[i] = x;
                    yz[i] = y;
                    if (x < x0) x0 = x;
                    if (x > x1) x1 = x;
                    if (y < y0) y0 = y;
                    if (y > y1) y1 = y;
                  }

                  // If there were no (valid) points, inherit the existing extent.
                  if (x1 < x0) x0 = this._x0, x1 = this._x1;
                  if (y1 < y0) y0 = this._y0, y1 = this._y1;

                  // Expand the tree to cover the new points.
                  this.cover(x0, y0).cover(x1, y1);

                  // Add the new points.
                  for (i = 0; i < n; ++i) {
                    add(this, xz[i], yz[i], data[i]);
                  }

                  return this;
                }

                var tree_cover = function(x, y) {
                  if (isNaN(x = +x) || isNaN(y = +y)) return this; // ignore invalid points

                  var x0 = this._x0,
                      y0 = this._y0,
                      x1 = this._x1,
                      y1 = this._y1;

                  // If the quadtree has no extent, initialize them.
                  // Integer extent are necessary so that if we later double the extent,
                  // the existing quadrant boundaries don’t change due to floating point error!
                  if (isNaN(x0)) {
                    x1 = (x0 = Math.floor(x)) + 1;
                    y1 = (y0 = Math.floor(y)) + 1;
                  }

                  // Otherwise, double repeatedly to cover.
                  else if (x0 > x || x > x1 || y0 > y || y > y1) {
                    var z = x1 - x0,
                        node = this._root,
                        parent,
                        i;

                    switch (i = (y < (y0 + y1) / 2) << 1 | (x < (x0 + x1) / 2)) {
                      case 0: {
                        do parent = new Array(4), parent[i] = node, node = parent;
                        while (z *= 2, x1 = x0 + z, y1 = y0 + z, x > x1 || y > y1);
                        break;
                      }
                      case 1: {
                        do parent = new Array(4), parent[i] = node, node = parent;
                        while (z *= 2, x0 = x1 - z, y1 = y0 + z, x0 > x || y > y1);
                        break;
                      }
                      case 2: {
                        do parent = new Array(4), parent[i] = node, node = parent;
                        while (z *= 2, x1 = x0 + z, y0 = y1 - z, x > x1 || y0 > y);
                        break;
                      }
                      case 3: {
                        do parent = new Array(4), parent[i] = node, node = parent;
                        while (z *= 2, x0 = x1 - z, y0 = y1 - z, x0 > x || y0 > y);
                        break;
                      }
                    }

                    if (this._root && this._root.length) this._root = node;
                  }

                  // If the quadtree covers the point already, just return.
                  else return this;

                  this._x0 = x0;
                  this._y0 = y0;
                  this._x1 = x1;
                  this._y1 = y1;
                  return this;
                };

                var tree_data = function() {
                  var data = [];
                  this.visit(function(node) {
                    if (!node.length) do data.push(node.data); while (node = node.next)
                  });
                  return data;
                };

                var tree_extent = function(_) {
                  return arguments.length
                      ? this.cover(+_[0][0], +_[0][1]).cover(+_[1][0], +_[1][1])
                      : isNaN(this._x0) ? undefined : [[this._x0, this._y0], [this._x1, this._y1]];
                };

                var Quad = function(node, x0, y0, x1, y1) {
                  this.node = node;
                  this.x0 = x0;
                  this.y0 = y0;
                  this.x1 = x1;
                  this.y1 = y1;
                };

                var tree_find = function(x, y, radius) {
                  var data,
                      x0 = this._x0,
                      y0 = this._y0,
                      x1,
                      y1,
                      x2,
                      y2,
                      x3 = this._x1,
                      y3 = this._y1,
                      quads = [],
                      node = this._root,
                      q,
                      i;

                  if (node) quads.push(new Quad(node, x0, y0, x3, y3));
                  if (radius == null) radius = Infinity;
                  else {
                    x0 = x - radius, y0 = y - radius;
                    x3 = x + radius, y3 = y + radius;
                    radius *= radius;
                  }

                  while (q = quads.pop()) {

                    // Stop searching if this quadrant can’t contain a closer node.
                    if (!(node = q.node)
                        || (x1 = q.x0) > x3
                        || (y1 = q.y0) > y3
                        || (x2 = q.x1) < x0
                        || (y2 = q.y1) < y0) continue;

                    // Bisect the current quadrant.
                    if (node.length) {
                      var xm = (x1 + x2) / 2,
                          ym = (y1 + y2) / 2;

                      quads.push(
                        new Quad(node[3], xm, ym, x2, y2),
                        new Quad(node[2], x1, ym, xm, y2),
                        new Quad(node[1], xm, y1, x2, ym),
                        new Quad(node[0], x1, y1, xm, ym)
                      );

                      // Visit the closest quadrant first.
                      if (i = (y >= ym) << 1 | (x >= xm)) {
                        q = quads[quads.length - 1];
                        quads[quads.length - 1] = quads[quads.length - 1 - i];
                        quads[quads.length - 1 - i] = q;
                      }
                    }

                    // Visit this point. (Visiting coincident points isn’t necessary!)
                    else {
                      var dx = x - +this._x.call(null, node.data),
                          dy = y - +this._y.call(null, node.data),
                          d2 = dx * dx + dy * dy;
                      if (d2 < radius) {
                        var d = Math.sqrt(radius = d2);
                        x0 = x - d, y0 = y - d;
                        x3 = x + d, y3 = y + d;
                        data = node.data;
                      }
                    }
                  }

                  return data;
                };

                var tree_remove = function(d) {
                  if (isNaN(x = +this._x.call(null, d)) || isNaN(y = +this._y.call(null, d))) return this; // ignore invalid points

                  var parent,
                      node = this._root,
                      retainer,
                      previous,
                      next,
                      x0 = this._x0,
                      y0 = this._y0,
                      x1 = this._x1,
                      y1 = this._y1,
                      x,
                      y,
                      xm,
                      ym,
                      right,
                      bottom,
                      i,
                      j;

                  // If the tree is empty, initialize the root as a leaf.
                  if (!node) return this;

                  // Find the leaf node for the point.
                  // While descending, also retain the deepest parent with a non-removed sibling.
                  if (node.length) while (true) {
                    if (right = x >= (xm = (x0 + x1) / 2)) x0 = xm; else x1 = xm;
                    if (bottom = y >= (ym = (y0 + y1) / 2)) y0 = ym; else y1 = ym;
                    if (!(parent = node, node = node[i = bottom << 1 | right])) return this;
                    if (!node.length) break;
                    if (parent[(i + 1) & 3] || parent[(i + 2) & 3] || parent[(i + 3) & 3]) retainer = parent, j = i;
                  }

                  // Find the point to remove.
                  while (node.data !== d) if (!(previous = node, node = node.next)) return this;
                  if (next = node.next) delete node.next;

                  // If there are multiple coincident points, remove just the point.
                  if (previous) return (next ? previous.next = next : delete previous.next), this;

                  // If this is the root point, remove it.
                  if (!parent) return this._root = next, this;

                  // Remove this leaf.
                  next ? parent[i] = next : delete parent[i];

                  // If the parent now contains exactly one leaf, collapse superfluous parents.
                  if ((node = parent[0] || parent[1] || parent[2] || parent[3])
                      && node === (parent[3] || parent[2] || parent[1] || parent[0])
                      && !node.length) {
                    if (retainer) retainer[j] = node;
                    else this._root = node;
                  }

                  return this;
                };

                function removeAll(data) {
                  for (var i = 0, n = data.length; i < n; ++i) this.remove(data[i]);
                  return this;
                }

                var tree_root = function() {
                  return this._root;
                };

                var tree_size = function() {
                  var size = 0;
                  this.visit(function(node) {
                    if (!node.length) do ++size; while (node = node.next)
                  });
                  return size;
                };

                var tree_visit = function(callback) {
                  var quads = [], q, node = this._root, child, x0, y0, x1, y1;
                  if (node) quads.push(new Quad(node, this._x0, this._y0, this._x1, this._y1));
                  while (q = quads.pop()) {
                    if (!callback(node = q.node, x0 = q.x0, y0 = q.y0, x1 = q.x1, y1 = q.y1) && node.length) {
                      var xm = (x0 + x1) / 2, ym = (y0 + y1) / 2;
                      if (child = node[3]) quads.push(new Quad(child, xm, ym, x1, y1));
                      if (child = node[2]) quads.push(new Quad(child, x0, ym, xm, y1));
                      if (child = node[1]) quads.push(new Quad(child, xm, y0, x1, ym));
                      if (child = node[0]) quads.push(new Quad(child, x0, y0, xm, ym));
                    }
                  }
                  return this;
                };

                var tree_visitAfter = function(callback) {
                  var quads = [], next = [], q;
                  if (this._root) quads.push(new Quad(this._root, this._x0, this._y0, this._x1, this._y1));
                  while (q = quads.pop()) {
                    var node = q.node;
                    if (node.length) {
                      var child, x0 = q.x0, y0 = q.y0, x1 = q.x1, y1 = q.y1, xm = (x0 + x1) / 2, ym = (y0 + y1) / 2;
                      if (child = node[0]) quads.push(new Quad(child, x0, y0, xm, ym));
                      if (child = node[1]) quads.push(new Quad(child, xm, y0, x1, ym));
                      if (child = node[2]) quads.push(new Quad(child, x0, ym, xm, y1));
                      if (child = node[3]) quads.push(new Quad(child, xm, ym, x1, y1));
                    }
                    next.push(q);
                  }
                  while (q = next.pop()) {
                    callback(q.node, q.x0, q.y0, q.x1, q.y1);
                  }
                  return this;
                };

                function defaultX(d) {
                  return d[0];
                }

                var tree_x = function(_) {
                  return arguments.length ? (this._x = _, this) : this._x;
                };

                function defaultY(d) {
                  return d[1];
                }

                var tree_y = function(_) {
                  return arguments.length ? (this._y = _, this) : this._y;
                };

                function quadtree(nodes, x, y) {
                  var tree = new Quadtree(x == null ? defaultX : x, y == null ? defaultY : y, NaN, NaN, NaN, NaN);
                  return nodes == null ? tree : tree.addAll(nodes);
                }

                function Quadtree(x, y, x0, y0, x1, y1) {
                  this._x = x;
                  this._y = y;
                  this._x0 = x0;
                  this._y0 = y0;
                  this._x1 = x1;
                  this._y1 = y1;
                  this._root = undefined;
                }

                function leaf_copy(leaf) {
                  var copy = {data: leaf.data}, next = copy;
                  while (leaf = leaf.next) next = next.next = {data: leaf.data};
                  return copy;
                }

                var treeProto = quadtree.prototype = Quadtree.prototype;

                treeProto.copy = function() {
                  var copy = new Quadtree(this._x, this._y, this._x0, this._y0, this._x1, this._y1),
                      node = this._root,
                      nodes,
                      child;

                  if (!node) return copy;

                  if (!node.length) return copy._root = leaf_copy(node), copy;

                  nodes = [{source: node, target: copy._root = new Array(4)}];
                  while (node = nodes.pop()) {
                    for (var i = 0; i < 4; ++i) {
                      if (child = node.source[i]) {
                        if (child.length) nodes.push({source: child, target: node.target[i] = new Array(4)});
                        else node.target[i] = leaf_copy(child);
                      }
                    }
                  }

                  return copy;
                };

                treeProto.add = tree_add;
                treeProto.addAll = addAll;
                treeProto.cover = tree_cover;
                treeProto.data = tree_data;
                treeProto.extent = tree_extent;
                treeProto.find = tree_find;
                treeProto.remove = tree_remove;
                treeProto.removeAll = removeAll;
                treeProto.root = tree_root;
                treeProto.size = tree_size;
                treeProto.visit = tree_visit;
                treeProto.visitAfter = tree_visitAfter;
                treeProto.x = tree_x;
                treeProto.y = tree_y;

                var slice$1 = [].slice;

                var noabort = {};

                function Queue(size) {
                  if (!(size >= 1)) throw new Error;
                  this._size = size;
                  this._call =
                  this._error = null;
                  this._tasks = [];
                  this._data = [];
                  this._waiting =
                  this._active =
                  this._ended =
                  this._start = 0; // inside a synchronous task callback?
                }

                Queue.prototype = queue.prototype = {
                  constructor: Queue,
                  defer: function(callback) {
                    if (typeof callback !== "function" || this._call) throw new Error;
                    if (this._error != null) return this;
                    var t = slice$1.call(arguments, 1);
                    t.push(callback);
                    ++this._waiting, this._tasks.push(t);
                    poke(this);
                    return this;
                  },
                  abort: function() {
                    if (this._error == null) abort(this, new Error("abort"));
                    return this;
                  },
                  await: function(callback) {
                    if (typeof callback !== "function" || this._call) throw new Error;
                    this._call = function(error, results) { callback.apply(null, [error].concat(results)); };
                    maybeNotify(this);
                    return this;
                  },
                  awaitAll: function(callback) {
                    if (typeof callback !== "function" || this._call) throw new Error;
                    this._call = callback;
                    maybeNotify(this);
                    return this;
                  }
                };

                function poke(q) {
                  if (!q._start) {
                    try { start(q); } // let the current task complete
                    catch (e) {
                      if (q._tasks[q._ended + q._active - 1]) abort(q, e); // task errored synchronously
                      else if (!q._data) throw e; // await callback errored synchronously
                    }
                  }
                }

                function start(q) {
                  while (q._start = q._waiting && q._active < q._size) {
                    var i = q._ended + q._active,
                        t = q._tasks[i],
                        j = t.length - 1,
                        c = t[j];
                    t[j] = end(q, i);
                    --q._waiting, ++q._active;
                    t = c.apply(null, t);
                    if (!q._tasks[i]) continue; // task finished synchronously
                    q._tasks[i] = t || noabort;
                  }
                }

                function end(q, i) {
                  return function(e, r) {
                    if (!q._tasks[i]) return; // ignore multiple callbacks
                    --q._active, ++q._ended;
                    q._tasks[i] = null;
                    if (q._error != null) return; // ignore secondary errors
                    if (e != null) {
                      abort(q, e);
                    } else {
                      q._data[i] = r;
                      if (q._waiting) poke(q);
                      else maybeNotify(q);
                    }
                  };
                }

                function abort(q, e) {
                  var i = q._tasks.length, t;
                  q._error = e; // ignore active callbacks
                  q._data = undefined; // allow gc
                  q._waiting = NaN; // prevent starting

                  while (--i >= 0) {
                    if (t = q._tasks[i]) {
                      q._tasks[i] = null;
                      if (t.abort) {
                        try { t.abort(); }
                        catch (e) { /* ignore */ }
                      }
                    }
                  }

                  q._active = NaN; // allow notification
                  maybeNotify(q);
                }

                function maybeNotify(q) {
                  if (!q._active && q._call) {
                    var d = q._data;
                    q._data = undefined; // allow gc
                    q._call(q._error, d);
                  }
                }

                function queue(concurrency) {
                  return new Queue(arguments.length ? +concurrency : Infinity);
                }

                var constant$2 = function(x) {
                  return function constant() {
                    return x;
                  };
                };

                var epsilon$1 = 1e-12;
                var pi$2 = Math.PI;
                var halfPi$1 = pi$2 / 2;
                var tau$2 = 2 * pi$2;

                function arcInnerRadius(d) {
                  return d.innerRadius;
                }

                function arcOuterRadius(d) {
                  return d.outerRadius;
                }

                function arcStartAngle(d) {
                  return d.startAngle;
                }

                function arcEndAngle(d) {
                  return d.endAngle;
                }

                function arcPadAngle(d) {
                  return d && d.padAngle; // Note: optional!
                }

                function asin(x) {
                  return x >= 1 ? halfPi$1 : x <= -1 ? -halfPi$1 : Math.asin(x);
                }

                function intersect(x0, y0, x1, y1, x2, y2, x3, y3) {
                  var x10 = x1 - x0, y10 = y1 - y0,
                      x32 = x3 - x2, y32 = y3 - y2,
                      t = (x32 * (y0 - y2) - y32 * (x0 - x2)) / (y32 * x10 - x32 * y10);
                  return [x0 + t * x10, y0 + t * y10];
                }

                // Compute perpendicular offset line of length rc.
                // http://mathworld.wolfram.com/Circle-LineIntersection.html
                function cornerTangents(x0, y0, x1, y1, r1, rc, cw) {
                  var x01 = x0 - x1,
                      y01 = y0 - y1,
                      lo = (cw ? rc : -rc) / Math.sqrt(x01 * x01 + y01 * y01),
                      ox = lo * y01,
                      oy = -lo * x01,
                      x11 = x0 + ox,
                      y11 = y0 + oy,
                      x10 = x1 + ox,
                      y10 = y1 + oy,
                      x00 = (x11 + x10) / 2,
                      y00 = (y11 + y10) / 2,
                      dx = x10 - x11,
                      dy = y10 - y11,
                      d2 = dx * dx + dy * dy,
                      r = r1 - rc,
                      D = x11 * y10 - x10 * y11,
                      d = (dy < 0 ? -1 : 1) * Math.sqrt(Math.max(0, r * r * d2 - D * D)),
                      cx0 = (D * dy - dx * d) / d2,
                      cy0 = (-D * dx - dy * d) / d2,
                      cx1 = (D * dy + dx * d) / d2,
                      cy1 = (-D * dx + dy * d) / d2,
                      dx0 = cx0 - x00,
                      dy0 = cy0 - y00,
                      dx1 = cx1 - x00,
                      dy1 = cy1 - y00;

                  // Pick the closer of the two intersection points.
                  // TODO Is there a faster way to determine which intersection to use?
                  if (dx0 * dx0 + dy0 * dy0 > dx1 * dx1 + dy1 * dy1) cx0 = cx1, cy0 = cy1;

                  return {
                    cx: cx0,
                    cy: cy0,
                    x01: -ox,
                    y01: -oy,
                    x11: cx0 * (r1 / r - 1),
                    y11: cy0 * (r1 / r - 1)
                  };
                }

                var arc = function() {
                  var innerRadius = arcInnerRadius,
                      outerRadius = arcOuterRadius,
                      cornerRadius = constant$2(0),
                      padRadius = null,
                      startAngle = arcStartAngle,
                      endAngle = arcEndAngle,
                      padAngle = arcPadAngle,
                      context = null;

                  function arc() {
                    var buffer,
                        r,
                        r0 = +innerRadius.apply(this, arguments),
                        r1 = +outerRadius.apply(this, arguments),
                        a0 = startAngle.apply(this, arguments) - halfPi$1,
                        a1 = endAngle.apply(this, arguments) - halfPi$1,
                        da = Math.abs(a1 - a0),
                        cw = a1 > a0;

                    if (!context) context = buffer = path();

                    // Ensure that the outer radius is always larger than the inner radius.
                    if (r1 < r0) r = r1, r1 = r0, r0 = r;

                    // Is it a point?
                    if (!(r1 > epsilon$1)) context.moveTo(0, 0);

                    // Or is it a circle or annulus?
                    else if (da > tau$2 - epsilon$1) {
                      context.moveTo(r1 * Math.cos(a0), r1 * Math.sin(a0));
                      context.arc(0, 0, r1, a0, a1, !cw);
                      if (r0 > epsilon$1) {
                        context.moveTo(r0 * Math.cos(a1), r0 * Math.sin(a1));
                        context.arc(0, 0, r0, a1, a0, cw);
                      }
                    }

                    // Or is it a circular or annular sector?
                    else {
                      var a01 = a0,
                          a11 = a1,
                          a00 = a0,
                          a10 = a1,
                          da0 = da,
                          da1 = da,
                          ap = padAngle.apply(this, arguments) / 2,
                          rp = (ap > epsilon$1) && (padRadius ? +padRadius.apply(this, arguments) : Math.sqrt(r0 * r0 + r1 * r1)),
                          rc = Math.min(Math.abs(r1 - r0) / 2, +cornerRadius.apply(this, arguments)),
                          rc0 = rc,
                          rc1 = rc,
                          t0,
                          t1;

                      // Apply padding? Note that since r1 ≥ r0, da1 ≥ da0.
                      if (rp > epsilon$1) {
                        var p0 = asin(rp / r0 * Math.sin(ap)),
                            p1 = asin(rp / r1 * Math.sin(ap));
                        if ((da0 -= p0 * 2) > epsilon$1) p0 *= (cw ? 1 : -1), a00 += p0, a10 -= p0;
                        else da0 = 0, a00 = a10 = (a0 + a1) / 2;
                        if ((da1 -= p1 * 2) > epsilon$1) p1 *= (cw ? 1 : -1), a01 += p1, a11 -= p1;
                        else da1 = 0, a01 = a11 = (a0 + a1) / 2;
                      }

                      var x01 = r1 * Math.cos(a01),
                          y01 = r1 * Math.sin(a01),
                          x10 = r0 * Math.cos(a10),
                          y10 = r0 * Math.sin(a10);

                      // Apply rounded corners?
                      if (rc > epsilon$1) {
                        var x11 = r1 * Math.cos(a11),
                            y11 = r1 * Math.sin(a11),
                            x00 = r0 * Math.cos(a00),
                            y00 = r0 * Math.sin(a00);

                        // Restrict the corner radius according to the sector angle.
                        if (da < pi$2) {
                          var oc = da0 > epsilon$1 ? intersect(x01, y01, x00, y00, x11, y11, x10, y10) : [x10, y10],
                              ax = x01 - oc[0],
                              ay = y01 - oc[1],
                              bx = x11 - oc[0],
                              by = y11 - oc[1],
                              kc = 1 / Math.sin(Math.acos((ax * bx + ay * by) / (Math.sqrt(ax * ax + ay * ay) * Math.sqrt(bx * bx + by * by))) / 2),
                              lc = Math.sqrt(oc[0] * oc[0] + oc[1] * oc[1]);
                          rc0 = Math.min(rc, (r0 - lc) / (kc - 1));
                          rc1 = Math.min(rc, (r1 - lc) / (kc + 1));
                        }
                      }

                      // Is the sector collapsed to a line?
                      if (!(da1 > epsilon$1)) context.moveTo(x01, y01);

                      // Does the sector’s outer ring have rounded corners?
                      else if (rc1 > epsilon$1) {
                        t0 = cornerTangents(x00, y00, x01, y01, r1, rc1, cw);
                        t1 = cornerTangents(x11, y11, x10, y10, r1, rc1, cw);

                        context.moveTo(t0.cx + t0.x01, t0.cy + t0.y01);

                        // Have the corners merged?
                        if (rc1 < rc) context.arc(t0.cx, t0.cy, rc1, Math.atan2(t0.y01, t0.x01), Math.atan2(t1.y01, t1.x01), !cw);

                        // Otherwise, draw the two corners and the ring.
                        else {
                          context.arc(t0.cx, t0.cy, rc1, Math.atan2(t0.y01, t0.x01), Math.atan2(t0.y11, t0.x11), !cw);
                          context.arc(0, 0, r1, Math.atan2(t0.cy + t0.y11, t0.cx + t0.x11), Math.atan2(t1.cy + t1.y11, t1.cx + t1.x11), !cw);
                          context.arc(t1.cx, t1.cy, rc1, Math.atan2(t1.y11, t1.x11), Math.atan2(t1.y01, t1.x01), !cw);
                        }
                      }

                      // Or is the outer ring just a circular arc?
                      else context.moveTo(x01, y01), context.arc(0, 0, r1, a01, a11, !cw);

                      // Is there no inner ring, and it’s a circular sector?
                      // Or perhaps it’s an annular sector collapsed due to padding?
                      if (!(r0 > epsilon$1) || !(da0 > epsilon$1)) context.lineTo(x10, y10);

                      // Does the sector’s inner ring (or point) have rounded corners?
                      else if (rc0 > epsilon$1) {
                        t0 = cornerTangents(x10, y10, x11, y11, r0, -rc0, cw);
                        t1 = cornerTangents(x01, y01, x00, y00, r0, -rc0, cw);

                        context.lineTo(t0.cx + t0.x01, t0.cy + t0.y01);

                        // Have the corners merged?
                        if (rc0 < rc) context.arc(t0.cx, t0.cy, rc0, Math.atan2(t0.y01, t0.x01), Math.atan2(t1.y01, t1.x01), !cw);

                        // Otherwise, draw the two corners and the ring.
                        else {
                          context.arc(t0.cx, t0.cy, rc0, Math.atan2(t0.y01, t0.x01), Math.atan2(t0.y11, t0.x11), !cw);
                          context.arc(0, 0, r0, Math.atan2(t0.cy + t0.y11, t0.cx + t0.x11), Math.atan2(t1.cy + t1.y11, t1.cx + t1.x11), cw);
                          context.arc(t1.cx, t1.cy, rc0, Math.atan2(t1.y11, t1.x11), Math.atan2(t1.y01, t1.x01), !cw);
                        }
                      }

                      // Or is the inner ring just a circular arc?
                      else context.arc(0, 0, r0, a10, a00, cw);
                    }

                    context.closePath();

                    if (buffer) return context = null, buffer + "" || null;
                  }

                  arc.centroid = function() {
                    var r = (+innerRadius.apply(this, arguments) + +outerRadius.apply(this, arguments)) / 2,
                        a = (+startAngle.apply(this, arguments) + +endAngle.apply(this, arguments)) / 2 - pi$2 / 2;
                    return [Math.cos(a) * r, Math.sin(a) * r];
                  };

                  arc.innerRadius = function(_) {
                    return arguments.length ? (innerRadius = typeof _ === "function" ? _ : constant$2(+_), arc) : innerRadius;
                  };

                  arc.outerRadius = function(_) {
                    return arguments.length ? (outerRadius = typeof _ === "function" ? _ : constant$2(+_), arc) : outerRadius;
                  };

                  arc.cornerRadius = function(_) {
                    return arguments.length ? (cornerRadius = typeof _ === "function" ? _ : constant$2(+_), arc) : cornerRadius;
                  };

                  arc.padRadius = function(_) {
                    return arguments.length ? (padRadius = _ == null ? null : typeof _ === "function" ? _ : constant$2(+_), arc) : padRadius;
                  };

                  arc.startAngle = function(_) {
                    return arguments.length ? (startAngle = typeof _ === "function" ? _ : constant$2(+_), arc) : startAngle;
                  };

                  arc.endAngle = function(_) {
                    return arguments.length ? (endAngle = typeof _ === "function" ? _ : constant$2(+_), arc) : endAngle;
                  };

                  arc.padAngle = function(_) {
                    return arguments.length ? (padAngle = typeof _ === "function" ? _ : constant$2(+_), arc) : padAngle;
                  };

                  arc.context = function(_) {
                    return arguments.length ? ((context = _ == null ? null : _), arc) : context;
                  };

                  return arc;
                };

                function Linear(context) {
                  this._context = context;
                }

                Linear.prototype = {
                  areaStart: function() {
                    this._line = 0;
                  },
                  areaEnd: function() {
                    this._line = NaN;
                  },
                  lineStart: function() {
                    this._point = 0;
                  },
                  lineEnd: function() {
                    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
                    this._line = 1 - this._line;
                  },
                  point: function(x, y) {
                    x = +x, y = +y;
                    switch (this._point) {
                      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
                      case 1: this._point = 2; // proceed
                      default: this._context.lineTo(x, y); break;
                    }
                  }
                };

                var curveLinear = function(context) {
                  return new Linear(context);
                };

                function x(p) {
                  return p[0];
                }

                function y(p) {
                  return p[1];
                }

                var line = function() {
                  var x$$1 = x,
                      y$$1 = y,
                      defined = constant$2(true),
                      context = null,
                      curve = curveLinear,
                      output = null;

                  function line(data) {
                    var i,
                        n = data.length,
                        d,
                        defined0 = false,
                        buffer;

                    if (context == null) output = curve(buffer = path());

                    for (i = 0; i <= n; ++i) {
                      if (!(i < n && defined(d = data[i], i, data)) === defined0) {
                        if (defined0 = !defined0) output.lineStart();
                        else output.lineEnd();
                      }
                      if (defined0) output.point(+x$$1(d, i, data), +y$$1(d, i, data));
                    }

                    if (buffer) return output = null, buffer + "" || null;
                  }

                  line.x = function(_) {
                    return arguments.length ? (x$$1 = typeof _ === "function" ? _ : constant$2(+_), line) : x$$1;
                  };

                  line.y = function(_) {
                    return arguments.length ? (y$$1 = typeof _ === "function" ? _ : constant$2(+_), line) : y$$1;
                  };

                  line.defined = function(_) {
                    return arguments.length ? (defined = typeof _ === "function" ? _ : constant$2(!!_), line) : defined;
                  };

                  line.curve = function(_) {
                    return arguments.length ? (curve = _, context != null && (output = curve(context)), line) : curve;
                  };

                  line.context = function(_) {
                    return arguments.length ? (_ == null ? context = output = null : output = curve(context = _), line) : context;
                  };

                  return line;
                };

                var area$1 = function() {
                  var x0 = x,
                      x1 = null,
                      y0 = constant$2(0),
                      y1 = y,
                      defined = constant$2(true),
                      context = null,
                      curve = curveLinear,
                      output = null;

                  function area(data) {
                    var i,
                        j,
                        k,
                        n = data.length,
                        d,
                        defined0 = false,
                        buffer,
                        x0z = new Array(n),
                        y0z = new Array(n);

                    if (context == null) output = curve(buffer = path());

                    for (i = 0; i <= n; ++i) {
                      if (!(i < n && defined(d = data[i], i, data)) === defined0) {
                        if (defined0 = !defined0) {
                          j = i;
                          output.areaStart();
                          output.lineStart();
                        } else {
                          output.lineEnd();
                          output.lineStart();
                          for (k = i - 1; k >= j; --k) {
                            output.point(x0z[k], y0z[k]);
                          }
                          output.lineEnd();
                          output.areaEnd();
                        }
                      }
                      if (defined0) {
                        x0z[i] = +x0(d, i, data), y0z[i] = +y0(d, i, data);
                        output.point(x1 ? +x1(d, i, data) : x0z[i], y1 ? +y1(d, i, data) : y0z[i]);
                      }
                    }

                    if (buffer) return output = null, buffer + "" || null;
                  }

                  function arealine() {
                    return line().defined(defined).curve(curve).context(context);
                  }

                  area.x = function(_) {
                    return arguments.length ? (x0 = typeof _ === "function" ? _ : constant$2(+_), x1 = null, area) : x0;
                  };

                  area.x0 = function(_) {
                    return arguments.length ? (x0 = typeof _ === "function" ? _ : constant$2(+_), area) : x0;
                  };

                  area.x1 = function(_) {
                    return arguments.length ? (x1 = _ == null ? null : typeof _ === "function" ? _ : constant$2(+_), area) : x1;
                  };

                  area.y = function(_) {
                    return arguments.length ? (y0 = typeof _ === "function" ? _ : constant$2(+_), y1 = null, area) : y0;
                  };

                  area.y0 = function(_) {
                    return arguments.length ? (y0 = typeof _ === "function" ? _ : constant$2(+_), area) : y0;
                  };

                  area.y1 = function(_) {
                    return arguments.length ? (y1 = _ == null ? null : typeof _ === "function" ? _ : constant$2(+_), area) : y1;
                  };

                  area.lineX0 =
                  area.lineY0 = function() {
                    return arealine().x(x0).y(y0);
                  };

                  area.lineY1 = function() {
                    return arealine().x(x0).y(y1);
                  };

                  area.lineX1 = function() {
                    return arealine().x(x1).y(y0);
                  };

                  area.defined = function(_) {
                    return arguments.length ? (defined = typeof _ === "function" ? _ : constant$2(!!_), area) : defined;
                  };

                  area.curve = function(_) {
                    return arguments.length ? (curve = _, context != null && (output = curve(context)), area) : curve;
                  };

                  area.context = function(_) {
                    return arguments.length ? (_ == null ? context = output = null : output = curve(context = _), area) : context;
                  };

                  return area;
                };

                var descending$1 = function(a, b) {
                  return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
                };

                var identity$1 = function(d) {
                  return d;
                };

                var pie = function() {
                  var value = identity$1,
                      sortValues = descending$1,
                      sort = null,
                      startAngle = constant$2(0),
                      endAngle = constant$2(tau$2),
                      padAngle = constant$2(0);

                  function pie(data) {
                    var i,
                        n = data.length,
                        j,
                        k,
                        sum = 0,
                        index = new Array(n),
                        arcs = new Array(n),
                        a0 = +startAngle.apply(this, arguments),
                        da = Math.min(tau$2, Math.max(-tau$2, endAngle.apply(this, arguments) - a0)),
                        a1,
                        p = Math.min(Math.abs(da) / n, padAngle.apply(this, arguments)),
                        pa = p * (da < 0 ? -1 : 1),
                        v;

                    for (i = 0; i < n; ++i) {
                      if ((v = arcs[index[i] = i] = +value(data[i], i, data)) > 0) {
                        sum += v;
                      }
                    }

                    // Optionally sort the arcs by previously-computed values or by data.
                    if (sortValues != null) index.sort(function(i, j) { return sortValues(arcs[i], arcs[j]); });
                    else if (sort != null) index.sort(function(i, j) { return sort(data[i], data[j]); });

                    // Compute the arcs! They are stored in the original data's order.
                    for (i = 0, k = sum ? (da - n * pa) / sum : 0; i < n; ++i, a0 = a1) {
                      j = index[i], v = arcs[j], a1 = a0 + (v > 0 ? v * k : 0) + pa, arcs[j] = {
                        data: data[j],
                        index: i,
                        value: v,
                        startAngle: a0,
                        endAngle: a1,
                        padAngle: p
                      };
                    }

                    return arcs;
                  }

                  pie.value = function(_) {
                    return arguments.length ? (value = typeof _ === "function" ? _ : constant$2(+_), pie) : value;
                  };

                  pie.sortValues = function(_) {
                    return arguments.length ? (sortValues = _, sort = null, pie) : sortValues;
                  };

                  pie.sort = function(_) {
                    return arguments.length ? (sort = _, sortValues = null, pie) : sort;
                  };

                  pie.startAngle = function(_) {
                    return arguments.length ? (startAngle = typeof _ === "function" ? _ : constant$2(+_), pie) : startAngle;
                  };

                  pie.endAngle = function(_) {
                    return arguments.length ? (endAngle = typeof _ === "function" ? _ : constant$2(+_), pie) : endAngle;
                  };

                  pie.padAngle = function(_) {
                    return arguments.length ? (padAngle = typeof _ === "function" ? _ : constant$2(+_), pie) : padAngle;
                  };

                  return pie;
                };

                var curveRadialLinear = curveRadial(curveLinear);

                function Radial(curve) {
                  this._curve = curve;
                }

                Radial.prototype = {
                  areaStart: function() {
                    this._curve.areaStart();
                  },
                  areaEnd: function() {
                    this._curve.areaEnd();
                  },
                  lineStart: function() {
                    this._curve.lineStart();
                  },
                  lineEnd: function() {
                    this._curve.lineEnd();
                  },
                  point: function(a, r) {
                    this._curve.point(r * Math.sin(a), r * -Math.cos(a));
                  }
                };

                function curveRadial(curve) {

                  function radial(context) {
                    return new Radial(curve(context));
                  }

                  radial._curve = curve;

                  return radial;
                }

                function radialLine(l) {
                  var c = l.curve;

                  l.angle = l.x, delete l.x;
                  l.radius = l.y, delete l.y;

                  l.curve = function(_) {
                    return arguments.length ? c(curveRadial(_)) : c()._curve;
                  };

                  return l;
                }

                var radialLine$1 = function() {
                  return radialLine(line().curve(curveRadialLinear));
                };

                var radialArea = function() {
                  var a = area$1().curve(curveRadialLinear),
                      c = a.curve,
                      x0 = a.lineX0,
                      x1 = a.lineX1,
                      y0 = a.lineY0,
                      y1 = a.lineY1;

                  a.angle = a.x, delete a.x;
                  a.startAngle = a.x0, delete a.x0;
                  a.endAngle = a.x1, delete a.x1;
                  a.radius = a.y, delete a.y;
                  a.innerRadius = a.y0, delete a.y0;
                  a.outerRadius = a.y1, delete a.y1;
                  a.lineStartAngle = function() { return radialLine(x0()); }, delete a.lineX0;
                  a.lineEndAngle = function() { return radialLine(x1()); }, delete a.lineX1;
                  a.lineInnerRadius = function() { return radialLine(y0()); }, delete a.lineY0;
                  a.lineOuterRadius = function() { return radialLine(y1()); }, delete a.lineY1;

                  a.curve = function(_) {
                    return arguments.length ? c(curveRadial(_)) : c()._curve;
                  };

                  return a;
                };

                var circle = {
                  draw: function(context, size) {
                    var r = Math.sqrt(size / pi$2);
                    context.moveTo(r, 0);
                    context.arc(0, 0, r, 0, tau$2);
                  }
                };

                var cross$1 = {
                  draw: function(context, size) {
                    var r = Math.sqrt(size / 5) / 2;
                    context.moveTo(-3 * r, -r);
                    context.lineTo(-r, -r);
                    context.lineTo(-r, -3 * r);
                    context.lineTo(r, -3 * r);
                    context.lineTo(r, -r);
                    context.lineTo(3 * r, -r);
                    context.lineTo(3 * r, r);
                    context.lineTo(r, r);
                    context.lineTo(r, 3 * r);
                    context.lineTo(-r, 3 * r);
                    context.lineTo(-r, r);
                    context.lineTo(-3 * r, r);
                    context.closePath();
                  }
                };

                var tan30 = Math.sqrt(1 / 3);
                var tan30_2 = tan30 * 2;

                var diamond = {
                  draw: function(context, size) {
                    var y = Math.sqrt(size / tan30_2),
                        x = y * tan30;
                    context.moveTo(0, -y);
                    context.lineTo(x, 0);
                    context.lineTo(0, y);
                    context.lineTo(-x, 0);
                    context.closePath();
                  }
                };

                var ka = 0.89081309152928522810;
                var kr = Math.sin(pi$2 / 10) / Math.sin(7 * pi$2 / 10);
                var kx = Math.sin(tau$2 / 10) * kr;
                var ky = -Math.cos(tau$2 / 10) * kr;

                var star = {
                  draw: function(context, size) {
                    var r = Math.sqrt(size * ka),
                        x = kx * r,
                        y = ky * r;
                    context.moveTo(0, -r);
                    context.lineTo(x, y);
                    for (var i = 1; i < 5; ++i) {
                      var a = tau$2 * i / 5,
                          c = Math.cos(a),
                          s = Math.sin(a);
                      context.lineTo(s * r, -c * r);
                      context.lineTo(c * x - s * y, s * x + c * y);
                    }
                    context.closePath();
                  }
                };

                var square = {
                  draw: function(context, size) {
                    var w = Math.sqrt(size),
                        x = -w / 2;
                    context.rect(x, x, w, w);
                  }
                };

                var sqrt3 = Math.sqrt(3);

                var triangle = {
                  draw: function(context, size) {
                    var y = -Math.sqrt(size / (sqrt3 * 3));
                    context.moveTo(0, y * 2);
                    context.lineTo(-sqrt3 * y, -y);
                    context.lineTo(sqrt3 * y, -y);
                    context.closePath();
                  }
                };

                var c = -0.5;
                var s = Math.sqrt(3) / 2;
                var k = 1 / Math.sqrt(12);
                var a = (k / 2 + 1) * 3;

                var wye = {
                  draw: function(context, size) {
                    var r = Math.sqrt(size / a),
                        x0 = r / 2,
                        y0 = r * k,
                        x1 = x0,
                        y1 = r * k + r,
                        x2 = -x1,
                        y2 = y1;
                    context.moveTo(x0, y0);
                    context.lineTo(x1, y1);
                    context.lineTo(x2, y2);
                    context.lineTo(c * x0 - s * y0, s * x0 + c * y0);
                    context.lineTo(c * x1 - s * y1, s * x1 + c * y1);
                    context.lineTo(c * x2 - s * y2, s * x2 + c * y2);
                    context.lineTo(c * x0 + s * y0, c * y0 - s * x0);
                    context.lineTo(c * x1 + s * y1, c * y1 - s * x1);
                    context.lineTo(c * x2 + s * y2, c * y2 - s * x2);
                    context.closePath();
                  }
                };

                var symbols = [
                  circle,
                  cross$1,
                  diamond,
                  square,
                  star,
                  triangle,
                  wye
                ];

                var symbol = function() {
                  var type = constant$2(circle),
                      size = constant$2(64),
                      context = null;

                  function symbol() {
                    var buffer;
                    if (!context) context = buffer = path();
                    type.apply(this, arguments).draw(context, +size.apply(this, arguments));
                    if (buffer) return context = null, buffer + "" || null;
                  }

                  symbol.type = function(_) {
                    return arguments.length ? (type = typeof _ === "function" ? _ : constant$2(_), symbol) : type;
                  };

                  symbol.size = function(_) {
                    return arguments.length ? (size = typeof _ === "function" ? _ : constant$2(+_), symbol) : size;
                  };

                  symbol.context = function(_) {
                    return arguments.length ? (context = _ == null ? null : _, symbol) : context;
                  };

                  return symbol;
                };

                var noop = function() {};

                function point(that, x, y) {
                  that._context.bezierCurveTo(
                    (2 * that._x0 + that._x1) / 3,
                    (2 * that._y0 + that._y1) / 3,
                    (that._x0 + 2 * that._x1) / 3,
                    (that._y0 + 2 * that._y1) / 3,
                    (that._x0 + 4 * that._x1 + x) / 6,
                    (that._y0 + 4 * that._y1 + y) / 6
                  );
                }

                function Basis(context) {
                  this._context = context;
                }

                Basis.prototype = {
                  areaStart: function() {
                    this._line = 0;
                  },
                  areaEnd: function() {
                    this._line = NaN;
                  },
                  lineStart: function() {
                    this._x0 = this._x1 =
                    this._y0 = this._y1 = NaN;
                    this._point = 0;
                  },
                  lineEnd: function() {
                    switch (this._point) {
                      case 3: point(this, this._x1, this._y1); // proceed
                      case 2: this._context.lineTo(this._x1, this._y1); break;
                    }
                    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
                    this._line = 1 - this._line;
                  },
                  point: function(x, y) {
                    x = +x, y = +y;
                    switch (this._point) {
                      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
                      case 1: this._point = 2; break;
                      case 2: this._point = 3; this._context.lineTo((5 * this._x0 + this._x1) / 6, (5 * this._y0 + this._y1) / 6); // proceed
                      default: point(this, x, y); break;
                    }
                    this._x0 = this._x1, this._x1 = x;
                    this._y0 = this._y1, this._y1 = y;
                  }
                };

                var basis = function(context) {
                  return new Basis(context);
                };

                function BasisClosed(context) {
                  this._context = context;
                }

                BasisClosed.prototype = {
                  areaStart: noop,
                  areaEnd: noop,
                  lineStart: function() {
                    this._x0 = this._x1 = this._x2 = this._x3 = this._x4 =
                    this._y0 = this._y1 = this._y2 = this._y3 = this._y4 = NaN;
                    this._point = 0;
                  },
                  lineEnd: function() {
                    switch (this._point) {
                      case 1: {
                        this._context.moveTo(this._x2, this._y2);
                        this._context.closePath();
                        break;
                      }
                      case 2: {
                        this._context.moveTo((this._x2 + 2 * this._x3) / 3, (this._y2 + 2 * this._y3) / 3);
                        this._context.lineTo((this._x3 + 2 * this._x2) / 3, (this._y3 + 2 * this._y2) / 3);
                        this._context.closePath();
                        break;
                      }
                      case 3: {
                        this.point(this._x2, this._y2);
                        this.point(this._x3, this._y3);
                        this.point(this._x4, this._y4);
                        break;
                      }
                    }
                  },
                  point: function(x, y) {
                    x = +x, y = +y;
                    switch (this._point) {
                      case 0: this._point = 1; this._x2 = x, this._y2 = y; break;
                      case 1: this._point = 2; this._x3 = x, this._y3 = y; break;
                      case 2: this._point = 3; this._x4 = x, this._y4 = y; this._context.moveTo((this._x0 + 4 * this._x1 + x) / 6, (this._y0 + 4 * this._y1 + y) / 6); break;
                      default: point(this, x, y); break;
                    }
                    this._x0 = this._x1, this._x1 = x;
                    this._y0 = this._y1, this._y1 = y;
                  }
                };

                var basisClosed = function(context) {
                  return new BasisClosed(context);
                };

                function BasisOpen(context) {
                  this._context = context;
                }

                BasisOpen.prototype = {
                  areaStart: function() {
                    this._line = 0;
                  },
                  areaEnd: function() {
                    this._line = NaN;
                  },
                  lineStart: function() {
                    this._x0 = this._x1 =
                    this._y0 = this._y1 = NaN;
                    this._point = 0;
                  },
                  lineEnd: function() {
                    if (this._line || (this._line !== 0 && this._point === 3)) this._context.closePath();
                    this._line = 1 - this._line;
                  },
                  point: function(x, y) {
                    x = +x, y = +y;
                    switch (this._point) {
                      case 0: this._point = 1; break;
                      case 1: this._point = 2; break;
                      case 2: this._point = 3; var x0 = (this._x0 + 4 * this._x1 + x) / 6, y0 = (this._y0 + 4 * this._y1 + y) / 6; this._line ? this._context.lineTo(x0, y0) : this._context.moveTo(x0, y0); break;
                      case 3: this._point = 4; // proceed
                      default: point(this, x, y); break;
                    }
                    this._x0 = this._x1, this._x1 = x;
                    this._y0 = this._y1, this._y1 = y;
                  }
                };

                var basisOpen = function(context) {
                  return new BasisOpen(context);
                };

                function Bundle(context, beta) {
                  this._basis = new Basis(context);
                  this._beta = beta;
                }

                Bundle.prototype = {
                  lineStart: function() {
                    this._x = [];
                    this._y = [];
                    this._basis.lineStart();
                  },
                  lineEnd: function() {
                    var x = this._x,
                        y = this._y,
                        j = x.length - 1;

                    if (j > 0) {
                      var x0 = x[0],
                          y0 = y[0],
                          dx = x[j] - x0,
                          dy = y[j] - y0,
                          i = -1,
                          t;

                      while (++i <= j) {
                        t = i / j;
                        this._basis.point(
                          this._beta * x[i] + (1 - this._beta) * (x0 + t * dx),
                          this._beta * y[i] + (1 - this._beta) * (y0 + t * dy)
                        );
                      }
                    }

                    this._x = this._y = null;
                    this._basis.lineEnd();
                  },
                  point: function(x, y) {
                    this._x.push(+x);
                    this._y.push(+y);
                  }
                };

                var bundle = (function custom(beta) {

                  function bundle(context) {
                    return beta === 1 ? new Basis(context) : new Bundle(context, beta);
                  }

                  bundle.beta = function(beta) {
                    return custom(+beta);
                  };

                  return bundle;
                })(0.85);

                function point$1(that, x, y) {
                  that._context.bezierCurveTo(
                    that._x1 + that._k * (that._x2 - that._x0),
                    that._y1 + that._k * (that._y2 - that._y0),
                    that._x2 + that._k * (that._x1 - x),
                    that._y2 + that._k * (that._y1 - y),
                    that._x2,
                    that._y2
                  );
                }

                function Cardinal(context, tension) {
                  this._context = context;
                  this._k = (1 - tension) / 6;
                }

                Cardinal.prototype = {
                  areaStart: function() {
                    this._line = 0;
                  },
                  areaEnd: function() {
                    this._line = NaN;
                  },
                  lineStart: function() {
                    this._x0 = this._x1 = this._x2 =
                    this._y0 = this._y1 = this._y2 = NaN;
                    this._point = 0;
                  },
                  lineEnd: function() {
                    switch (this._point) {
                      case 2: this._context.lineTo(this._x2, this._y2); break;
                      case 3: point$1(this, this._x1, this._y1); break;
                    }
                    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
                    this._line = 1 - this._line;
                  },
                  point: function(x, y) {
                    x = +x, y = +y;
                    switch (this._point) {
                      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
                      case 1: this._point = 2; this._x1 = x, this._y1 = y; break;
                      case 2: this._point = 3; // proceed
                      default: point$1(this, x, y); break;
                    }
                    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
                    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
                  }
                };

                var cardinal = (function custom(tension) {

                  function cardinal(context) {
                    return new Cardinal(context, tension);
                  }

                  cardinal.tension = function(tension) {
                    return custom(+tension);
                  };

                  return cardinal;
                })(0);

                function CardinalClosed(context, tension) {
                  this._context = context;
                  this._k = (1 - tension) / 6;
                }

                CardinalClosed.prototype = {
                  areaStart: noop,
                  areaEnd: noop,
                  lineStart: function() {
                    this._x0 = this._x1 = this._x2 = this._x3 = this._x4 = this._x5 =
                    this._y0 = this._y1 = this._y2 = this._y3 = this._y4 = this._y5 = NaN;
                    this._point = 0;
                  },
                  lineEnd: function() {
                    switch (this._point) {
                      case 1: {
                        this._context.moveTo(this._x3, this._y3);
                        this._context.closePath();
                        break;
                      }
                      case 2: {
                        this._context.lineTo(this._x3, this._y3);
                        this._context.closePath();
                        break;
                      }
                      case 3: {
                        this.point(this._x3, this._y3);
                        this.point(this._x4, this._y4);
                        this.point(this._x5, this._y5);
                        break;
                      }
                    }
                  },
                  point: function(x, y) {
                    x = +x, y = +y;
                    switch (this._point) {
                      case 0: this._point = 1; this._x3 = x, this._y3 = y; break;
                      case 1: this._point = 2; this._context.moveTo(this._x4 = x, this._y4 = y); break;
                      case 2: this._point = 3; this._x5 = x, this._y5 = y; break;
                      default: point$1(this, x, y); break;
                    }
                    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
                    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
                  }
                };

                var cardinalClosed = (function custom(tension) {

                  function cardinal(context) {
                    return new CardinalClosed(context, tension);
                  }

                  cardinal.tension = function(tension) {
                    return custom(+tension);
                  };

                  return cardinal;
                })(0);

                function CardinalOpen(context, tension) {
                  this._context = context;
                  this._k = (1 - tension) / 6;
                }

                CardinalOpen.prototype = {
                  areaStart: function() {
                    this._line = 0;
                  },
                  areaEnd: function() {
                    this._line = NaN;
                  },
                  lineStart: function() {
                    this._x0 = this._x1 = this._x2 =
                    this._y0 = this._y1 = this._y2 = NaN;
                    this._point = 0;
                  },
                  lineEnd: function() {
                    if (this._line || (this._line !== 0 && this._point === 3)) this._context.closePath();
                    this._line = 1 - this._line;
                  },
                  point: function(x, y) {
                    x = +x, y = +y;
                    switch (this._point) {
                      case 0: this._point = 1; break;
                      case 1: this._point = 2; break;
                      case 2: this._point = 3; this._line ? this._context.lineTo(this._x2, this._y2) : this._context.moveTo(this._x2, this._y2); break;
                      case 3: this._point = 4; // proceed
                      default: point$1(this, x, y); break;
                    }
                    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
                    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
                  }
                };

                var cardinalOpen = (function custom(tension) {

                  function cardinal(context) {
                    return new CardinalOpen(context, tension);
                  }

                  cardinal.tension = function(tension) {
                    return custom(+tension);
                  };

                  return cardinal;
                })(0);

                function point$2(that, x, y) {
                  var x1 = that._x1,
                      y1 = that._y1,
                      x2 = that._x2,
                      y2 = that._y2;

                  if (that._l01_a > epsilon$1) {
                    var a = 2 * that._l01_2a + 3 * that._l01_a * that._l12_a + that._l12_2a,
                        n = 3 * that._l01_a * (that._l01_a + that._l12_a);
                    x1 = (x1 * a - that._x0 * that._l12_2a + that._x2 * that._l01_2a) / n;
                    y1 = (y1 * a - that._y0 * that._l12_2a + that._y2 * that._l01_2a) / n;
                  }

                  if (that._l23_a > epsilon$1) {
                    var b = 2 * that._l23_2a + 3 * that._l23_a * that._l12_a + that._l12_2a,
                        m = 3 * that._l23_a * (that._l23_a + that._l12_a);
                    x2 = (x2 * b + that._x1 * that._l23_2a - x * that._l12_2a) / m;
                    y2 = (y2 * b + that._y1 * that._l23_2a - y * that._l12_2a) / m;
                  }

                  that._context.bezierCurveTo(x1, y1, x2, y2, that._x2, that._y2);
                }

                function CatmullRom(context, alpha) {
                  this._context = context;
                  this._alpha = alpha;
                }

                CatmullRom.prototype = {
                  areaStart: function() {
                    this._line = 0;
                  },
                  areaEnd: function() {
                    this._line = NaN;
                  },
                  lineStart: function() {
                    this._x0 = this._x1 = this._x2 =
                    this._y0 = this._y1 = this._y2 = NaN;
                    this._l01_a = this._l12_a = this._l23_a =
                    this._l01_2a = this._l12_2a = this._l23_2a =
                    this._point = 0;
                  },
                  lineEnd: function() {
                    switch (this._point) {
                      case 2: this._context.lineTo(this._x2, this._y2); break;
                      case 3: this.point(this._x2, this._y2); break;
                    }
                    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
                    this._line = 1 - this._line;
                  },
                  point: function(x, y) {
                    x = +x, y = +y;

                    if (this._point) {
                      var x23 = this._x2 - x,
                          y23 = this._y2 - y;
                      this._l23_a = Math.sqrt(this._l23_2a = Math.pow(x23 * x23 + y23 * y23, this._alpha));
                    }

                    switch (this._point) {
                      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
                      case 1: this._point = 2; break;
                      case 2: this._point = 3; // proceed
                      default: point$2(this, x, y); break;
                    }

                    this._l01_a = this._l12_a, this._l12_a = this._l23_a;
                    this._l01_2a = this._l12_2a, this._l12_2a = this._l23_2a;
                    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
                    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
                  }
                };

                var catmullRom = (function custom(alpha) {

                  function catmullRom(context) {
                    return alpha ? new CatmullRom(context, alpha) : new Cardinal(context, 0);
                  }

                  catmullRom.alpha = function(alpha) {
                    return custom(+alpha);
                  };

                  return catmullRom;
                })(0.5);

                function CatmullRomClosed(context, alpha) {
                  this._context = context;
                  this._alpha = alpha;
                }

                CatmullRomClosed.prototype = {
                  areaStart: noop,
                  areaEnd: noop,
                  lineStart: function() {
                    this._x0 = this._x1 = this._x2 = this._x3 = this._x4 = this._x5 =
                    this._y0 = this._y1 = this._y2 = this._y3 = this._y4 = this._y5 = NaN;
                    this._l01_a = this._l12_a = this._l23_a =
                    this._l01_2a = this._l12_2a = this._l23_2a =
                    this._point = 0;
                  },
                  lineEnd: function() {
                    switch (this._point) {
                      case 1: {
                        this._context.moveTo(this._x3, this._y3);
                        this._context.closePath();
                        break;
                      }
                      case 2: {
                        this._context.lineTo(this._x3, this._y3);
                        this._context.closePath();
                        break;
                      }
                      case 3: {
                        this.point(this._x3, this._y3);
                        this.point(this._x4, this._y4);
                        this.point(this._x5, this._y5);
                        break;
                      }
                    }
                  },
                  point: function(x, y) {
                    x = +x, y = +y;

                    if (this._point) {
                      var x23 = this._x2 - x,
                          y23 = this._y2 - y;
                      this._l23_a = Math.sqrt(this._l23_2a = Math.pow(x23 * x23 + y23 * y23, this._alpha));
                    }

                    switch (this._point) {
                      case 0: this._point = 1; this._x3 = x, this._y3 = y; break;
                      case 1: this._point = 2; this._context.moveTo(this._x4 = x, this._y4 = y); break;
                      case 2: this._point = 3; this._x5 = x, this._y5 = y; break;
                      default: point$2(this, x, y); break;
                    }

                    this._l01_a = this._l12_a, this._l12_a = this._l23_a;
                    this._l01_2a = this._l12_2a, this._l12_2a = this._l23_2a;
                    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
                    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
                  }
                };

                var catmullRomClosed = (function custom(alpha) {

                  function catmullRom(context) {
                    return alpha ? new CatmullRomClosed(context, alpha) : new CardinalClosed(context, 0);
                  }

                  catmullRom.alpha = function(alpha) {
                    return custom(+alpha);
                  };

                  return catmullRom;
                })(0.5);

                function CatmullRomOpen(context, alpha) {
                  this._context = context;
                  this._alpha = alpha;
                }

                CatmullRomOpen.prototype = {
                  areaStart: function() {
                    this._line = 0;
                  },
                  areaEnd: function() {
                    this._line = NaN;
                  },
                  lineStart: function() {
                    this._x0 = this._x1 = this._x2 =
                    this._y0 = this._y1 = this._y2 = NaN;
                    this._l01_a = this._l12_a = this._l23_a =
                    this._l01_2a = this._l12_2a = this._l23_2a =
                    this._point = 0;
                  },
                  lineEnd: function() {
                    if (this._line || (this._line !== 0 && this._point === 3)) this._context.closePath();
                    this._line = 1 - this._line;
                  },
                  point: function(x, y) {
                    x = +x, y = +y;

                    if (this._point) {
                      var x23 = this._x2 - x,
                          y23 = this._y2 - y;
                      this._l23_a = Math.sqrt(this._l23_2a = Math.pow(x23 * x23 + y23 * y23, this._alpha));
                    }

                    switch (this._point) {
                      case 0: this._point = 1; break;
                      case 1: this._point = 2; break;
                      case 2: this._point = 3; this._line ? this._context.lineTo(this._x2, this._y2) : this._context.moveTo(this._x2, this._y2); break;
                      case 3: this._point = 4; // proceed
                      default: point$2(this, x, y); break;
                    }

                    this._l01_a = this._l12_a, this._l12_a = this._l23_a;
                    this._l01_2a = this._l12_2a, this._l12_2a = this._l23_2a;
                    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
                    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
                  }
                };

                var catmullRomOpen = (function custom(alpha) {

                  function catmullRom(context) {
                    return alpha ? new CatmullRomOpen(context, alpha) : new CardinalOpen(context, 0);
                  }

                  catmullRom.alpha = function(alpha) {
                    return custom(+alpha);
                  };

                  return catmullRom;
                })(0.5);

                function LinearClosed(context) {
                  this._context = context;
                }

                LinearClosed.prototype = {
                  areaStart: noop,
                  areaEnd: noop,
                  lineStart: function() {
                    this._point = 0;
                  },
                  lineEnd: function() {
                    if (this._point) this._context.closePath();
                  },
                  point: function(x, y) {
                    x = +x, y = +y;
                    if (this._point) this._context.lineTo(x, y);
                    else this._point = 1, this._context.moveTo(x, y);
                  }
                };

                var linearClosed = function(context) {
                  return new LinearClosed(context);
                };

                function sign(x) {
                  return x < 0 ? -1 : 1;
                }

                // Calculate the slopes of the tangents (Hermite-type interpolation) based on
                // the following paper: Steffen, M. 1990. A Simple Method for Monotonic
                // Interpolation in One Dimension. Astronomy and Astrophysics, Vol. 239, NO.
                // NOV(II), P. 443, 1990.
                function slope3(that, x2, y2) {
                  var h0 = that._x1 - that._x0,
                      h1 = x2 - that._x1,
                      s0 = (that._y1 - that._y0) / (h0 || h1 < 0 && -0),
                      s1 = (y2 - that._y1) / (h1 || h0 < 0 && -0),
                      p = (s0 * h1 + s1 * h0) / (h0 + h1);
                  return (sign(s0) + sign(s1)) * Math.min(Math.abs(s0), Math.abs(s1), 0.5 * Math.abs(p)) || 0;
                }

                // Calculate a one-sided slope.
                function slope2(that, t) {
                  var h = that._x1 - that._x0;
                  return h ? (3 * (that._y1 - that._y0) / h - t) / 2 : t;
                }

                // According to https://en.wikipedia.org/wiki/Cubic_Hermite_spline#Representations
                // "you can express cubic Hermite interpolation in terms of cubic Bézier curves
                // with respect to the four values p0, p0 + m0 / 3, p1 - m1 / 3, p1".
                function point$3(that, t0, t1) {
                  var x0 = that._x0,
                      y0 = that._y0,
                      x1 = that._x1,
                      y1 = that._y1,
                      dx = (x1 - x0) / 3;
                  that._context.bezierCurveTo(x0 + dx, y0 + dx * t0, x1 - dx, y1 - dx * t1, x1, y1);
                }

                function MonotoneX(context) {
                  this._context = context;
                }

                MonotoneX.prototype = {
                  areaStart: function() {
                    this._line = 0;
                  },
                  areaEnd: function() {
                    this._line = NaN;
                  },
                  lineStart: function() {
                    this._x0 = this._x1 =
                    this._y0 = this._y1 =
                    this._t0 = NaN;
                    this._point = 0;
                  },
                  lineEnd: function() {
                    switch (this._point) {
                      case 2: this._context.lineTo(this._x1, this._y1); break;
                      case 3: point$3(this, this._t0, slope2(this, this._t0)); break;
                    }
                    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
                    this._line = 1 - this._line;
                  },
                  point: function(x, y) {
                    var t1 = NaN;

                    x = +x, y = +y;
                    if (x === this._x1 && y === this._y1) return; // Ignore coincident points.
                    switch (this._point) {
                      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
                      case 1: this._point = 2; break;
                      case 2: this._point = 3; point$3(this, slope2(this, t1 = slope3(this, x, y)), t1); break;
                      default: point$3(this, this._t0, t1 = slope3(this, x, y)); break;
                    }

                    this._x0 = this._x1, this._x1 = x;
                    this._y0 = this._y1, this._y1 = y;
                    this._t0 = t1;
                  }
                };

                function MonotoneY(context) {
                  this._context = new ReflectContext(context);
                }

                (MonotoneY.prototype = Object.create(MonotoneX.prototype)).point = function(x, y) {
                  MonotoneX.prototype.point.call(this, y, x);
                };

                function ReflectContext(context) {
                  this._context = context;
                }

                ReflectContext.prototype = {
                  moveTo: function(x, y) { this._context.moveTo(y, x); },
                  closePath: function() { this._context.closePath(); },
                  lineTo: function(x, y) { this._context.lineTo(y, x); },
                  bezierCurveTo: function(x1, y1, x2, y2, x, y) { this._context.bezierCurveTo(y1, x1, y2, x2, y, x); }
                };

                function monotoneX(context) {
                  return new MonotoneX(context);
                }

                function monotoneY(context) {
                  return new MonotoneY(context);
                }

                function Natural(context) {
                  this._context = context;
                }

                Natural.prototype = {
                  areaStart: function() {
                    this._line = 0;
                  },
                  areaEnd: function() {
                    this._line = NaN;
                  },
                  lineStart: function() {
                    this._x = [];
                    this._y = [];
                  },
                  lineEnd: function() {
                    var x = this._x,
                        y = this._y,
                        n = x.length;

                    if (n) {
                      this._line ? this._context.lineTo(x[0], y[0]) : this._context.moveTo(x[0], y[0]);
                      if (n === 2) {
                        this._context.lineTo(x[1], y[1]);
                      } else {
                        var px = controlPoints(x),
                            py = controlPoints(y);
                        for (var i0 = 0, i1 = 1; i1 < n; ++i0, ++i1) {
                          this._context.bezierCurveTo(px[0][i0], py[0][i0], px[1][i0], py[1][i0], x[i1], y[i1]);
                        }
                      }
                    }

                    if (this._line || (this._line !== 0 && n === 1)) this._context.closePath();
                    this._line = 1 - this._line;
                    this._x = this._y = null;
                  },
                  point: function(x, y) {
                    this._x.push(+x);
                    this._y.push(+y);
                  }
                };

                // See https://www.particleincell.com/2012/bezier-splines/ for derivation.
                function controlPoints(x) {
                  var i,
                      n = x.length - 1,
                      m,
                      a = new Array(n),
                      b = new Array(n),
                      r = new Array(n);
                  a[0] = 0, b[0] = 2, r[0] = x[0] + 2 * x[1];
                  for (i = 1; i < n - 1; ++i) a[i] = 1, b[i] = 4, r[i] = 4 * x[i] + 2 * x[i + 1];
                  a[n - 1] = 2, b[n - 1] = 7, r[n - 1] = 8 * x[n - 1] + x[n];
                  for (i = 1; i < n; ++i) m = a[i] / b[i - 1], b[i] -= m, r[i] -= m * r[i - 1];
                  a[n - 1] = r[n - 1] / b[n - 1];
                  for (i = n - 2; i >= 0; --i) a[i] = (r[i] - a[i + 1]) / b[i];
                  b[n - 1] = (x[n] + a[n - 1]) / 2;
                  for (i = 0; i < n - 1; ++i) b[i] = 2 * x[i + 1] - a[i + 1];
                  return [a, b];
                }

                var natural = function(context) {
                  return new Natural(context);
                };

                function Step(context, t) {
                  this._context = context;
                  this._t = t;
                }

                Step.prototype = {
                  areaStart: function() {
                    this._line = 0;
                  },
                  areaEnd: function() {
                    this._line = NaN;
                  },
                  lineStart: function() {
                    this._x = this._y = NaN;
                    this._point = 0;
                  },
                  lineEnd: function() {
                    if (0 < this._t && this._t < 1 && this._point === 2) this._context.lineTo(this._x, this._y);
                    if (this._line || (this._line !== 0 && this._point === 1)) this._context.closePath();
                    if (this._line >= 0) this._t = 1 - this._t, this._line = 1 - this._line;
                  },
                  point: function(x, y) {
                    x = +x, y = +y;
                    switch (this._point) {
                      case 0: this._point = 1; this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y); break;
                      case 1: this._point = 2; // proceed
                      default: {
                        if (this._t <= 0) {
                          this._context.lineTo(this._x, y);
                          this._context.lineTo(x, y);
                        } else {
                          var x1 = this._x * (1 - this._t) + x * this._t;
                          this._context.lineTo(x1, this._y);
                          this._context.lineTo(x1, y);
                        }
                        break;
                      }
                    }
                    this._x = x, this._y = y;
                  }
                };

                var step = function(context) {
                  return new Step(context, 0.5);
                };

                function stepBefore(context) {
                  return new Step(context, 0);
                }

                function stepAfter(context) {
                  return new Step(context, 1);
                }

                var slice$2 = Array.prototype.slice;

                var none = function(series, order) {
                  if (!((n = series.length) > 1)) return;
                  for (var i = 1, s0, s1 = series[order[0]], n, m = s1.length; i < n; ++i) {
                    s0 = s1, s1 = series[order[i]];
                    for (var j = 0; j < m; ++j) {
                      s1[j][1] += s1[j][0] = isNaN(s0[j][1]) ? s0[j][0] : s0[j][1];
                    }
                  }
                };

                var none$1 = function(series) {
                  var n = series.length, o = new Array(n);
                  while (--n >= 0) o[n] = n;
                  return o;
                };

                function stackValue(d, key) {
                  return d[key];
                }

                var stack = function() {
                  var keys = constant$2([]),
                      order = none$1,
                      offset = none,
                      value = stackValue;

                  function stack(data) {
                    var kz = keys.apply(this, arguments),
                        i,
                        m = data.length,
                        n = kz.length,
                        sz = new Array(n),
                        oz;

                    for (i = 0; i < n; ++i) {
                      for (var ki = kz[i], si = sz[i] = new Array(m), j = 0, sij; j < m; ++j) {
                        si[j] = sij = [0, +value(data[j], ki, j, data)];
                        sij.data = data[j];
                      }
                      si.key = ki;
                    }

                    for (i = 0, oz = order(sz); i < n; ++i) {
                      sz[oz[i]].index = i;
                    }

                    offset(sz, oz);
                    return sz;
                  }

                  stack.keys = function(_) {
                    return arguments.length ? (keys = typeof _ === "function" ? _ : constant$2(slice$2.call(_)), stack) : keys;
                  };

                  stack.value = function(_) {
                    return arguments.length ? (value = typeof _ === "function" ? _ : constant$2(+_), stack) : value;
                  };

                  stack.order = function(_) {
                    return arguments.length ? (order = _ == null ? none$1 : typeof _ === "function" ? _ : constant$2(slice$2.call(_)), stack) : order;
                  };

                  stack.offset = function(_) {
                    return arguments.length ? (offset = _ == null ? none : _, stack) : offset;
                  };

                  return stack;
                };

                var expand = function(series, order) {
                  if (!((n = series.length) > 0)) return;
                  for (var i, n, j = 0, m = series[0].length, y; j < m; ++j) {
                    for (y = i = 0; i < n; ++i) y += series[i][j][1] || 0;
                    if (y) for (i = 0; i < n; ++i) series[i][j][1] /= y;
                  }
                  none(series, order);
                };

                var silhouette = function(series, order) {
                  if (!((n = series.length) > 0)) return;
                  for (var j = 0, s0 = series[order[0]], n, m = s0.length; j < m; ++j) {
                    for (var i = 0, y = 0; i < n; ++i) y += series[i][j][1] || 0;
                    s0[j][1] += s0[j][0] = -y / 2;
                  }
                  none(series, order);
                };

                var wiggle = function(series, order) {
                  if (!((n = series.length) > 0) || !((m = (s0 = series[order[0]]).length) > 0)) return;
                  for (var y = 0, j = 1, s0, m, n; j < m; ++j) {
                    for (var i = 0, s1 = 0, s2 = 0; i < n; ++i) {
                      var si = series[order[i]],
                          sij0 = si[j][1] || 0,
                          sij1 = si[j - 1][1] || 0,
                          s3 = (sij0 - sij1) / 2;
                      for (var k = 0; k < i; ++k) {
                        var sk = series[order[k]],
                            skj0 = sk[j][1] || 0,
                            skj1 = sk[j - 1][1] || 0;
                        s3 += skj0 - skj1;
                      }
                      s1 += sij0, s2 += s3 * sij0;
                    }
                    s0[j - 1][1] += s0[j - 1][0] = y;
                    if (s1) y -= s2 / s1;
                  }
                  s0[j - 1][1] += s0[j - 1][0] = y;
                  none(series, order);
                };

                var ascending$1 = function(series) {
                  var sums = series.map(sum$1);
                  return none$1(series).sort(function(a, b) { return sums[a] - sums[b]; });
                };

                function sum$1(series) {
                  var s = 0, i = -1, n = series.length, v;
                  while (++i < n) if (v = +series[i][1]) s += v;
                  return s;
                }

                var descending$2 = function(series) {
                  return ascending$1(series).reverse();
                };

                var insideOut = function(series) {
                  var n = series.length,
                      i,
                      j,
                      sums = series.map(sum$1),
                      order = none$1(series).sort(function(a, b) { return sums[b] - sums[a]; }),
                      top = 0,
                      bottom = 0,
                      tops = [],
                      bottoms = [];

                  for (i = 0; i < n; ++i) {
                    j = order[i];
                    if (top < bottom) {
                      top += sums[j];
                      tops.push(j);
                    } else {
                      bottom += sums[j];
                      bottoms.push(j);
                    }
                  }

                  return bottoms.reverse().concat(tops);
                };

                var reverse = function(series) {
                  return none$1(series).reverse();
                };

                var define = function(constructor, factory, prototype) {
                  constructor.prototype = factory.prototype = prototype;
                  prototype.constructor = constructor;
                };

                function extend(parent, definition) {
                  var prototype = Object.create(parent.prototype);
                  for (var key in definition) prototype[key] = definition[key];
                  return prototype;
                }

                function Color() {}

                var darker = 0.7;
                var brighter = 1 / darker;

                var reHex3 = /^#([0-9a-f]{3})$/;
                var reHex6 = /^#([0-9a-f]{6})$/;
                var reRgbInteger = /^rgb\(\s*([-+]?\d+)\s*,\s*([-+]?\d+)\s*,\s*([-+]?\d+)\s*\)$/;
                var reRgbPercent = /^rgb\(\s*([-+]?\d+(?:\.\d+)?)%\s*,\s*([-+]?\d+(?:\.\d+)?)%\s*,\s*([-+]?\d+(?:\.\d+)?)%\s*\)$/;
                var reRgbaInteger = /^rgba\(\s*([-+]?\d+)\s*,\s*([-+]?\d+)\s*,\s*([-+]?\d+)\s*,\s*([-+]?\d+(?:\.\d+)?)\s*\)$/;
                var reRgbaPercent = /^rgba\(\s*([-+]?\d+(?:\.\d+)?)%\s*,\s*([-+]?\d+(?:\.\d+)?)%\s*,\s*([-+]?\d+(?:\.\d+)?)%\s*,\s*([-+]?\d+(?:\.\d+)?)\s*\)$/;
                var reHslPercent = /^hsl\(\s*([-+]?\d+(?:\.\d+)?)\s*,\s*([-+]?\d+(?:\.\d+)?)%\s*,\s*([-+]?\d+(?:\.\d+)?)%\s*\)$/;
                var reHslaPercent = /^hsla\(\s*([-+]?\d+(?:\.\d+)?)\s*,\s*([-+]?\d+(?:\.\d+)?)%\s*,\s*([-+]?\d+(?:\.\d+)?)%\s*,\s*([-+]?\d+(?:\.\d+)?)\s*\)$/;

                var named = {
                  aliceblue: 0xf0f8ff,
                  antiquewhite: 0xfaebd7,
                  aqua: 0x00ffff,
                  aquamarine: 0x7fffd4,
                  azure: 0xf0ffff,
                  beige: 0xf5f5dc,
                  bisque: 0xffe4c4,
                  black: 0x000000,
                  blanchedalmond: 0xffebcd,
                  blue: 0x0000ff,
                  blueviolet: 0x8a2be2,
                  brown: 0xa52a2a,
                  burlywood: 0xdeb887,
                  cadetblue: 0x5f9ea0,
                  chartreuse: 0x7fff00,
                  chocolate: 0xd2691e,
                  coral: 0xff7f50,
                  cornflowerblue: 0x6495ed,
                  cornsilk: 0xfff8dc,
                  crimson: 0xdc143c,
                  cyan: 0x00ffff,
                  darkblue: 0x00008b,
                  darkcyan: 0x008b8b,
                  darkgoldenrod: 0xb8860b,
                  darkgray: 0xa9a9a9,
                  darkgreen: 0x006400,
                  darkgrey: 0xa9a9a9,
                  darkkhaki: 0xbdb76b,
                  darkmagenta: 0x8b008b,
                  darkolivegreen: 0x556b2f,
                  darkorange: 0xff8c00,
                  darkorchid: 0x9932cc,
                  darkred: 0x8b0000,
                  darksalmon: 0xe9967a,
                  darkseagreen: 0x8fbc8f,
                  darkslateblue: 0x483d8b,
                  darkslategray: 0x2f4f4f,
                  darkslategrey: 0x2f4f4f,
                  darkturquoise: 0x00ced1,
                  darkviolet: 0x9400d3,
                  deeppink: 0xff1493,
                  deepskyblue: 0x00bfff,
                  dimgray: 0x696969,
                  dimgrey: 0x696969,
                  dodgerblue: 0x1e90ff,
                  firebrick: 0xb22222,
                  floralwhite: 0xfffaf0,
                  forestgreen: 0x228b22,
                  fuchsia: 0xff00ff,
                  gainsboro: 0xdcdcdc,
                  ghostwhite: 0xf8f8ff,
                  gold: 0xffd700,
                  goldenrod: 0xdaa520,
                  gray: 0x808080,
                  green: 0x008000,
                  greenyellow: 0xadff2f,
                  grey: 0x808080,
                  honeydew: 0xf0fff0,
                  hotpink: 0xff69b4,
                  indianred: 0xcd5c5c,
                  indigo: 0x4b0082,
                  ivory: 0xfffff0,
                  khaki: 0xf0e68c,
                  lavender: 0xe6e6fa,
                  lavenderblush: 0xfff0f5,
                  lawngreen: 0x7cfc00,
                  lemonchiffon: 0xfffacd,
                  lightblue: 0xadd8e6,
                  lightcoral: 0xf08080,
                  lightcyan: 0xe0ffff,
                  lightgoldenrodyellow: 0xfafad2,
                  lightgray: 0xd3d3d3,
                  lightgreen: 0x90ee90,
                  lightgrey: 0xd3d3d3,
                  lightpink: 0xffb6c1,
                  lightsalmon: 0xffa07a,
                  lightseagreen: 0x20b2aa,
                  lightskyblue: 0x87cefa,
                  lightslategray: 0x778899,
                  lightslategrey: 0x778899,
                  lightsteelblue: 0xb0c4de,
                  lightyellow: 0xffffe0,
                  lime: 0x00ff00,
                  limegreen: 0x32cd32,
                  linen: 0xfaf0e6,
                  magenta: 0xff00ff,
                  maroon: 0x800000,
                  mediumaquamarine: 0x66cdaa,
                  mediumblue: 0x0000cd,
                  mediumorchid: 0xba55d3,
                  mediumpurple: 0x9370db,
                  mediumseagreen: 0x3cb371,
                  mediumslateblue: 0x7b68ee,
                  mediumspringgreen: 0x00fa9a,
                  mediumturquoise: 0x48d1cc,
                  mediumvioletred: 0xc71585,
                  midnightblue: 0x191970,
                  mintcream: 0xf5fffa,
                  mistyrose: 0xffe4e1,
                  moccasin: 0xffe4b5,
                  navajowhite: 0xffdead,
                  navy: 0x000080,
                  oldlace: 0xfdf5e6,
                  olive: 0x808000,
                  olivedrab: 0x6b8e23,
                  orange: 0xffa500,
                  orangered: 0xff4500,
                  orchid: 0xda70d6,
                  palegoldenrod: 0xeee8aa,
                  palegreen: 0x98fb98,
                  paleturquoise: 0xafeeee,
                  palevioletred: 0xdb7093,
                  papayawhip: 0xffefd5,
                  peachpuff: 0xffdab9,
                  peru: 0xcd853f,
                  pink: 0xffc0cb,
                  plum: 0xdda0dd,
                  powderblue: 0xb0e0e6,
                  purple: 0x800080,
                  rebeccapurple: 0x663399,
                  red: 0xff0000,
                  rosybrown: 0xbc8f8f,
                  royalblue: 0x4169e1,
                  saddlebrown: 0x8b4513,
                  salmon: 0xfa8072,
                  sandybrown: 0xf4a460,
                  seagreen: 0x2e8b57,
                  seashell: 0xfff5ee,
                  sienna: 0xa0522d,
                  silver: 0xc0c0c0,
                  skyblue: 0x87ceeb,
                  slateblue: 0x6a5acd,
                  slategray: 0x708090,
                  slategrey: 0x708090,
                  snow: 0xfffafa,
                  springgreen: 0x00ff7f,
                  steelblue: 0x4682b4,
                  tan: 0xd2b48c,
                  teal: 0x008080,
                  thistle: 0xd8bfd8,
                  tomato: 0xff6347,
                  turquoise: 0x40e0d0,
                  violet: 0xee82ee,
                  wheat: 0xf5deb3,
                  white: 0xffffff,
                  whitesmoke: 0xf5f5f5,
                  yellow: 0xffff00,
                  yellowgreen: 0x9acd32
                };

                define(Color, color, {
                  displayable: function() {
                    return this.rgb().displayable();
                  },
                  toString: function() {
                    return this.rgb() + "";
                  }
                });

                function color(format) {
                  var m;
                  format = (format + "").trim().toLowerCase();
                  return (m = reHex3.exec(format)) ? (m = parseInt(m[1], 16), new Rgb((m >> 8 & 0xf) | (m >> 4 & 0x0f0), (m >> 4 & 0xf) | (m & 0xf0), ((m & 0xf) << 4) | (m & 0xf), 1)) // #f00
                      : (m = reHex6.exec(format)) ? rgbn(parseInt(m[1], 16)) // #ff0000
                      : (m = reRgbInteger.exec(format)) ? new Rgb(m[1], m[2], m[3], 1) // rgb(255, 0, 0)
                      : (m = reRgbPercent.exec(format)) ? new Rgb(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, 1) // rgb(100%, 0%, 0%)
                      : (m = reRgbaInteger.exec(format)) ? rgba(m[1], m[2], m[3], m[4]) // rgba(255, 0, 0, 1)
                      : (m = reRgbaPercent.exec(format)) ? rgba(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, m[4]) // rgb(100%, 0%, 0%, 1)
                      : (m = reHslPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, 1) // hsl(120, 50%, 50%)
                      : (m = reHslaPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, m[4]) // hsla(120, 50%, 50%, 1)
                      : named.hasOwnProperty(format) ? rgbn(named[format])
                      : format === "transparent" ? new Rgb(NaN, NaN, NaN, 0)
                      : null;
                }

                function rgbn(n) {
                  return new Rgb(n >> 16 & 0xff, n >> 8 & 0xff, n & 0xff, 1);
                }

                function rgba(r, g, b, a) {
                  if (a <= 0) r = g = b = NaN;
                  return new Rgb(r, g, b, a);
                }

                function rgbConvert(o) {
                  if (!(o instanceof Color)) o = color(o);
                  if (!o) return new Rgb;
                  o = o.rgb();
                  return new Rgb(o.r, o.g, o.b, o.opacity);
                }

                function rgb(r, g, b, opacity) {
                  return arguments.length === 1 ? rgbConvert(r) : new Rgb(r, g, b, opacity == null ? 1 : opacity);
                }

                function Rgb(r, g, b, opacity) {
                  this.r = +r;
                  this.g = +g;
                  this.b = +b;
                  this.opacity = +opacity;
                }

                define(Rgb, rgb, extend(Color, {
                  brighter: function(k) {
                    k = k == null ? brighter : Math.pow(brighter, k);
                    return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
                  },
                  darker: function(k) {
                    k = k == null ? darker : Math.pow(darker, k);
                    return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
                  },
                  rgb: function() {
                    return this;
                  },
                  displayable: function() {
                    return (0 <= this.r && this.r <= 255)
                        && (0 <= this.g && this.g <= 255)
                        && (0 <= this.b && this.b <= 255)
                        && (0 <= this.opacity && this.opacity <= 1);
                  },
                  toString: function() {
                    var a = this.opacity; a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));
                    return (a === 1 ? "rgb(" : "rgba(")
                        + Math.max(0, Math.min(255, Math.round(this.r) || 0)) + ", "
                        + Math.max(0, Math.min(255, Math.round(this.g) || 0)) + ", "
                        + Math.max(0, Math.min(255, Math.round(this.b) || 0))
                        + (a === 1 ? ")" : ", " + a + ")");
                  }
                }));

                function hsla(h, s, l, a) {
                  if (a <= 0) h = s = l = NaN;
                  else if (l <= 0 || l >= 1) h = s = NaN;
                  else if (s <= 0) h = NaN;
                  return new Hsl(h, s, l, a);
                }

                function hslConvert(o) {
                  if (o instanceof Hsl) return new Hsl(o.h, o.s, o.l, o.opacity);
                  if (!(o instanceof Color)) o = color(o);
                  if (!o) return new Hsl;
                  if (o instanceof Hsl) return o;
                  o = o.rgb();
                  var r = o.r / 255,
                      g = o.g / 255,
                      b = o.b / 255,
                      min = Math.min(r, g, b),
                      max = Math.max(r, g, b),
                      h = NaN,
                      s = max - min,
                      l = (max + min) / 2;
                  if (s) {
                    if (r === max) h = (g - b) / s + (g < b) * 6;
                    else if (g === max) h = (b - r) / s + 2;
                    else h = (r - g) / s + 4;
                    s /= l < 0.5 ? max + min : 2 - max - min;
                    h *= 60;
                  } else {
                    s = l > 0 && l < 1 ? 0 : h;
                  }
                  return new Hsl(h, s, l, o.opacity);
                }

                function hsl(h, s, l, opacity) {
                  return arguments.length === 1 ? hslConvert(h) : new Hsl(h, s, l, opacity == null ? 1 : opacity);
                }

                function Hsl(h, s, l, opacity) {
                  this.h = +h;
                  this.s = +s;
                  this.l = +l;
                  this.opacity = +opacity;
                }

                define(Hsl, hsl, extend(Color, {
                  brighter: function(k) {
                    k = k == null ? brighter : Math.pow(brighter, k);
                    return new Hsl(this.h, this.s, this.l * k, this.opacity);
                  },
                  darker: function(k) {
                    k = k == null ? darker : Math.pow(darker, k);
                    return new Hsl(this.h, this.s, this.l * k, this.opacity);
                  },
                  rgb: function() {
                    var h = this.h % 360 + (this.h < 0) * 360,
                        s = isNaN(h) || isNaN(this.s) ? 0 : this.s,
                        l = this.l,
                        m2 = l + (l < 0.5 ? l : 1 - l) * s,
                        m1 = 2 * l - m2;
                    return new Rgb(
                      hsl2rgb(h >= 240 ? h - 240 : h + 120, m1, m2),
                      hsl2rgb(h, m1, m2),
                      hsl2rgb(h < 120 ? h + 240 : h - 120, m1, m2),
                      this.opacity
                    );
                  },
                  displayable: function() {
                    return (0 <= this.s && this.s <= 1 || isNaN(this.s))
                        && (0 <= this.l && this.l <= 1)
                        && (0 <= this.opacity && this.opacity <= 1);
                  }
                }));

                /* From FvD 13.37, CSS Color Module Level 3 */
                function hsl2rgb(h, m1, m2) {
                  return (h < 60 ? m1 + (m2 - m1) * h / 60
                      : h < 180 ? m2
                      : h < 240 ? m1 + (m2 - m1) * (240 - h) / 60
                      : m1) * 255;
                }

                var deg2rad = Math.PI / 180;
                var rad2deg = 180 / Math.PI;

                var Kn = 18;
                var Xn = 0.950470;
                var Yn = 1;
                var Zn = 1.088830;
                var t0 = 4 / 29;
                var t1 = 6 / 29;
                var t2 = 3 * t1 * t1;
                var t3 = t1 * t1 * t1;

                function labConvert(o) {
                  if (o instanceof Lab) return new Lab(o.l, o.a, o.b, o.opacity);
                  if (o instanceof Hcl) {
                    var h = o.h * deg2rad;
                    return new Lab(o.l, Math.cos(h) * o.c, Math.sin(h) * o.c, o.opacity);
                  }
                  if (!(o instanceof Rgb)) o = rgbConvert(o);
                  var b = rgb2xyz(o.r),
                      a = rgb2xyz(o.g),
                      l = rgb2xyz(o.b),
                      x = xyz2lab((0.4124564 * b + 0.3575761 * a + 0.1804375 * l) / Xn),
                      y = xyz2lab((0.2126729 * b + 0.7151522 * a + 0.0721750 * l) / Yn),
                      z = xyz2lab((0.0193339 * b + 0.1191920 * a + 0.9503041 * l) / Zn);
                  return new Lab(116 * y - 16, 500 * (x - y), 200 * (y - z), o.opacity);
                }

                function lab(l, a, b, opacity) {
                  return arguments.length === 1 ? labConvert(l) : new Lab(l, a, b, opacity == null ? 1 : opacity);
                }

                function Lab(l, a, b, opacity) {
                  this.l = +l;
                  this.a = +a;
                  this.b = +b;
                  this.opacity = +opacity;
                }

                define(Lab, lab, extend(Color, {
                  brighter: function(k) {
                    return new Lab(this.l + Kn * (k == null ? 1 : k), this.a, this.b, this.opacity);
                  },
                  darker: function(k) {
                    return new Lab(this.l - Kn * (k == null ? 1 : k), this.a, this.b, this.opacity);
                  },
                  rgb: function() {
                    var y = (this.l + 16) / 116,
                        x = isNaN(this.a) ? y : y + this.a / 500,
                        z = isNaN(this.b) ? y : y - this.b / 200;
                    y = Yn * lab2xyz(y);
                    x = Xn * lab2xyz(x);
                    z = Zn * lab2xyz(z);
                    return new Rgb(
                      xyz2rgb( 3.2404542 * x - 1.5371385 * y - 0.4985314 * z), // D65 -> sRGB
                      xyz2rgb(-0.9692660 * x + 1.8760108 * y + 0.0415560 * z),
                      xyz2rgb( 0.0556434 * x - 0.2040259 * y + 1.0572252 * z),
                      this.opacity
                    );
                  }
                }));

                function xyz2lab(t) {
                  return t > t3 ? Math.pow(t, 1 / 3) : t / t2 + t0;
                }

                function lab2xyz(t) {
                  return t > t1 ? t * t * t : t2 * (t - t0);
                }

                function xyz2rgb(x) {
                  return 255 * (x <= 0.0031308 ? 12.92 * x : 1.055 * Math.pow(x, 1 / 2.4) - 0.055);
                }

                function rgb2xyz(x) {
                  return (x /= 255) <= 0.04045 ? x / 12.92 : Math.pow((x + 0.055) / 1.055, 2.4);
                }

                function hclConvert(o) {
                  if (o instanceof Hcl) return new Hcl(o.h, o.c, o.l, o.opacity);
                  if (!(o instanceof Lab)) o = labConvert(o);
                  var h = Math.atan2(o.b, o.a) * rad2deg;
                  return new Hcl(h < 0 ? h + 360 : h, Math.sqrt(o.a * o.a + o.b * o.b), o.l, o.opacity);
                }

                function hcl(h, c, l, opacity) {
                  return arguments.length === 1 ? hclConvert(h) : new Hcl(h, c, l, opacity == null ? 1 : opacity);
                }

                function Hcl(h, c, l, opacity) {
                  this.h = +h;
                  this.c = +c;
                  this.l = +l;
                  this.opacity = +opacity;
                }

                define(Hcl, hcl, extend(Color, {
                  brighter: function(k) {
                    return new Hcl(this.h, this.c, this.l + Kn * (k == null ? 1 : k), this.opacity);
                  },
                  darker: function(k) {
                    return new Hcl(this.h, this.c, this.l - Kn * (k == null ? 1 : k), this.opacity);
                  },
                  rgb: function() {
                    return labConvert(this).rgb();
                  }
                }));

                var A = -0.14861;
                var B = +1.78277;
                var C = -0.29227;
                var D = -0.90649;
                var E = +1.97294;
                var ED = E * D;
                var EB = E * B;
                var BC_DA = B * C - D * A;

                function cubehelixConvert(o) {
                  if (o instanceof Cubehelix) return new Cubehelix(o.h, o.s, o.l, o.opacity);
                  if (!(o instanceof Rgb)) o = rgbConvert(o);
                  var r = o.r / 255,
                      g = o.g / 255,
                      b = o.b / 255,
                      l = (BC_DA * b + ED * r - EB * g) / (BC_DA + ED - EB),
                      bl = b - l,
                      k = (E * (g - l) - C * bl) / D,
                      s = Math.sqrt(k * k + bl * bl) / (E * l * (1 - l)), // NaN if l=0 or l=1
                      h = s ? Math.atan2(k, bl) * rad2deg - 120 : NaN;
                  return new Cubehelix(h < 0 ? h + 360 : h, s, l, o.opacity);
                }

                function cubehelix(h, s, l, opacity) {
                  return arguments.length === 1 ? cubehelixConvert(h) : new Cubehelix(h, s, l, opacity == null ? 1 : opacity);
                }

                function Cubehelix(h, s, l, opacity) {
                  this.h = +h;
                  this.s = +s;
                  this.l = +l;
                  this.opacity = +opacity;
                }

                define(Cubehelix, cubehelix, extend(Color, {
                  brighter: function(k) {
                    k = k == null ? brighter : Math.pow(brighter, k);
                    return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
                  },
                  darker: function(k) {
                    k = k == null ? darker : Math.pow(darker, k);
                    return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
                  },
                  rgb: function() {
                    var h = isNaN(this.h) ? 0 : (this.h + 120) * deg2rad,
                        l = +this.l,
                        a = isNaN(this.s) ? 0 : this.s * l * (1 - l),
                        cosh = Math.cos(h),
                        sinh = Math.sin(h);
                    return new Rgb(
                      255 * (l + a * (A * cosh + B * sinh)),
                      255 * (l + a * (C * cosh + D * sinh)),
                      255 * (l + a * (E * cosh)),
                      this.opacity
                    );
                  }
                }));

                function basis$1(t1, v0, v1, v2, v3) {
                  var t2 = t1 * t1, t3 = t2 * t1;
                  return ((1 - 3 * t1 + 3 * t2 - t3) * v0
                      + (4 - 6 * t2 + 3 * t3) * v1
                      + (1 + 3 * t1 + 3 * t2 - 3 * t3) * v2
                      + t3 * v3) / 6;
                }

                var basis$2 = function(values) {
                  var n = values.length - 1;
                  return function(t) {
                    var i = t <= 0 ? (t = 0) : t >= 1 ? (t = 1, n - 1) : Math.floor(t * n),
                        v1 = values[i],
                        v2 = values[i + 1],
                        v0 = i > 0 ? values[i - 1] : 2 * v1 - v2,
                        v3 = i < n - 1 ? values[i + 2] : 2 * v2 - v1;
                    return basis$1((t - i / n) * n, v0, v1, v2, v3);
                  };
                };

                var basisClosed$1 = function(values) {
                  var n = values.length;
                  return function(t) {
                    var i = Math.floor(((t %= 1) < 0 ? ++t : t) * n),
                        v0 = values[(i + n - 1) % n],
                        v1 = values[i % n],
                        v2 = values[(i + 1) % n],
                        v3 = values[(i + 2) % n];
                    return basis$1((t - i / n) * n, v0, v1, v2, v3);
                  };
                };

                var constant$3 = function(x) {
                  return function() {
                    return x;
                  };
                };

                function linear$1(a, d) {
                  return function(t) {
                    return a + t * d;
                  };
                }

                function exponential$1(a, b, y) {
                  return a = Math.pow(a, y), b = Math.pow(b, y) - a, y = 1 / y, function(t) {
                    return Math.pow(a + t * b, y);
                  };
                }

                function hue(a, b) {
                  var d = b - a;
                  return d ? linear$1(a, d > 180 || d < -180 ? d - 360 * Math.round(d / 360) : d) : constant$3(isNaN(a) ? b : a);
                }

                function gamma(y) {
                  return (y = +y) === 1 ? nogamma : function(a, b) {
                    return b - a ? exponential$1(a, b, y) : constant$3(isNaN(a) ? b : a);
                  };
                }

                function nogamma(a, b) {
                  var d = b - a;
                  return d ? linear$1(a, d) : constant$3(isNaN(a) ? b : a);
                }

                var interpolateRgb = (function rgbGamma(y) {
                  var color$$1 = gamma(y);

                  function rgb$$1(start, end) {
                    var r = color$$1((start = rgb(start)).r, (end = rgb(end)).r),
                        g = color$$1(start.g, end.g),
                        b = color$$1(start.b, end.b),
                        opacity = color$$1(start.opacity, end.opacity);
                    return function(t) {
                      start.r = r(t);
                      start.g = g(t);
                      start.b = b(t);
                      start.opacity = opacity(t);
                      return start + "";
                    };
                  }

                  rgb$$1.gamma = rgbGamma;

                  return rgb$$1;
                })(1);

                function rgbSpline(spline) {
                  return function(colors) {
                    var n = colors.length,
                        r = new Array(n),
                        g = new Array(n),
                        b = new Array(n),
                        i, color$$1;
                    for (i = 0; i < n; ++i) {
                      color$$1 = rgb(colors[i]);
                      r[i] = color$$1.r || 0;
                      g[i] = color$$1.g || 0;
                      b[i] = color$$1.b || 0;
                    }
                    r = spline(r);
                    g = spline(g);
                    b = spline(b);
                    color$$1.opacity = 1;
                    return function(t) {
                      color$$1.r = r(t);
                      color$$1.g = g(t);
                      color$$1.b = b(t);
                      return color$$1 + "";
                    };
                  };
                }

                var rgbBasis = rgbSpline(basis$2);
                var rgbBasisClosed = rgbSpline(basisClosed$1);

                var array$1 = function(a, b) {
                  var nb = b ? b.length : 0,
                      na = a ? Math.min(nb, a.length) : 0,
                      x = new Array(nb),
                      c = new Array(nb),
                      i;

                  for (i = 0; i < na; ++i) x[i] = interpolate(a[i], b[i]);
                  for (; i < nb; ++i) c[i] = b[i];

                  return function(t) {
                    for (i = 0; i < na; ++i) c[i] = x[i](t);
                    return c;
                  };
                };

                var date = function(a, b) {
                  var d = new Date;
                  return a = +a, b -= a, function(t) {
                    return d.setTime(a + b * t), d;
                  };
                };

                var interpolateNumber = function(a, b) {
                  return a = +a, b -= a, function(t) {
                    return a + b * t;
                  };
                };

                var object = function(a, b) {
                  var i = {},
                      c = {},
                      k;

                  if (a === null || typeof a !== "object") a = {};
                  if (b === null || typeof b !== "object") b = {};

                  for (k in b) {
                    if (k in a) {
                      i[k] = interpolate(a[k], b[k]);
                    } else {
                      c[k] = b[k];
                    }
                  }

                  return function(t) {
                    for (k in i) c[k] = i[k](t);
                    return c;
                  };
                };

                var reA = /[-+]?(?:\d+\.?\d*|\.?\d+)(?:[eE][-+]?\d+)?/g;
                var reB = new RegExp(reA.source, "g");

                function zero(b) {
                  return function() {
                    return b;
                  };
                }

                function one(b) {
                  return function(t) {
                    return b(t) + "";
                  };
                }

                var interpolateString = function(a, b) {
                  var bi = reA.lastIndex = reB.lastIndex = 0, // scan index for next number in b
                      am, // current match in a
                      bm, // current match in b
                      bs, // string preceding current number in b, if any
                      i = -1, // index in s
                      s = [], // string constants and placeholders
                      q = []; // number interpolators

                  // Coerce inputs to strings.
                  a = a + "", b = b + "";

                  // Interpolate pairs of numbers in a & b.
                  while ((am = reA.exec(a))
                      && (bm = reB.exec(b))) {
                    if ((bs = bm.index) > bi) { // a string precedes the next number in b
                      bs = b.slice(bi, bs);
                      if (s[i]) s[i] += bs; // coalesce with previous string
                      else s[++i] = bs;
                    }
                    if ((am = am[0]) === (bm = bm[0])) { // numbers in a & b match
                      if (s[i]) s[i] += bm; // coalesce with previous string
                      else s[++i] = bm;
                    } else { // interpolate non-matching numbers
                      s[++i] = null;
                      q.push({i: i, x: interpolateNumber(am, bm)});
                    }
                    bi = reB.lastIndex;
                  }

                  // Add remains of b.
                  if (bi < b.length) {
                    bs = b.slice(bi);
                    if (s[i]) s[i] += bs; // coalesce with previous string
                    else s[++i] = bs;
                  }

                  // Special optimization for only a single match.
                  // Otherwise, interpolate each of the numbers and rejoin the string.
                  return s.length < 2 ? (q[0]
                      ? one(q[0].x)
                      : zero(b))
                      : (b = q.length, function(t) {
                          for (var i = 0, o; i < b; ++i) s[(o = q[i]).i] = o.x(t);
                          return s.join("");
                        });
                };

                var interpolate = function(a, b) {
                  var t = typeof b, c;
                  return b == null || t === "boolean" ? constant$3(b)
                      : (t === "number" ? interpolateNumber
                      : t === "string" ? ((c = color(b)) ? (b = c, interpolateRgb) : interpolateString)
                      : b instanceof color ? interpolateRgb
                      : b instanceof Date ? date
                      : Array.isArray(b) ? array$1
                      : isNaN(b) ? object
                      : interpolateNumber)(a, b);
                };

                var interpolateRound = function(a, b) {
                  return a = +a, b -= a, function(t) {
                    return Math.round(a + b * t);
                  };
                };

                var degrees = 180 / Math.PI;

                var identity$2 = {
                  translateX: 0,
                  translateY: 0,
                  rotate: 0,
                  skewX: 0,
                  scaleX: 1,
                  scaleY: 1
                };

                var decompose = function(a, b, c, d, e, f) {
                  var scaleX, scaleY, skewX;
                  if (scaleX = Math.sqrt(a * a + b * b)) a /= scaleX, b /= scaleX;
                  if (skewX = a * c + b * d) c -= a * skewX, d -= b * skewX;
                  if (scaleY = Math.sqrt(c * c + d * d)) c /= scaleY, d /= scaleY, skewX /= scaleY;
                  if (a * d < b * c) a = -a, b = -b, skewX = -skewX, scaleX = -scaleX;
                  return {
                    translateX: e,
                    translateY: f,
                    rotate: Math.atan2(b, a) * degrees,
                    skewX: Math.atan(skewX) * degrees,
                    scaleX: scaleX,
                    scaleY: scaleY
                  };
                };

                var cssNode;
                var cssRoot;
                var cssView;
                var svgNode;

                function parseCss(value) {
                  if (value === "none") return identity$2;
                  if (!cssNode) cssNode = document.createElement("DIV"), cssRoot = document.documentElement, cssView = document.defaultView;
                  cssNode.style.transform = value;
                  value = cssView.getComputedStyle(cssRoot.appendChild(cssNode), null).getPropertyValue("transform");
                  cssRoot.removeChild(cssNode);
                  value = value.slice(7, -1).split(",");
                  return decompose(+value[0], +value[1], +value[2], +value[3], +value[4], +value[5]);
                }

                function parseSvg(value) {
                  if (value == null) return identity$2;
                  if (!svgNode) svgNode = document.createElementNS("http://www.w3.org/2000/svg", "g");
                  svgNode.setAttribute("transform", value);
                  if (!(value = svgNode.transform.baseVal.consolidate())) return identity$2;
                  value = value.matrix;
                  return decompose(value.a, value.b, value.c, value.d, value.e, value.f);
                }

                function interpolateTransform(parse, pxComma, pxParen, degParen) {

                  function pop(s) {
                    return s.length ? s.pop() + " " : "";
                  }

                  function translate(xa, ya, xb, yb, s, q) {
                    if (xa !== xb || ya !== yb) {
                      var i = s.push("translate(", null, pxComma, null, pxParen);
                      q.push({i: i - 4, x: interpolateNumber(xa, xb)}, {i: i - 2, x: interpolateNumber(ya, yb)});
                    } else if (xb || yb) {
                      s.push("translate(" + xb + pxComma + yb + pxParen);
                    }
                  }

                  function rotate(a, b, s, q) {
                    if (a !== b) {
                      if (a - b > 180) b += 360; else if (b - a > 180) a += 360; // shortest path
                      q.push({i: s.push(pop(s) + "rotate(", null, degParen) - 2, x: interpolateNumber(a, b)});
                    } else if (b) {
                      s.push(pop(s) + "rotate(" + b + degParen);
                    }
                  }

                  function skewX(a, b, s, q) {
                    if (a !== b) {
                      q.push({i: s.push(pop(s) + "skewX(", null, degParen) - 2, x: interpolateNumber(a, b)});
                    } else if (b) {
                      s.push(pop(s) + "skewX(" + b + degParen);
                    }
                  }

                  function scale(xa, ya, xb, yb, s, q) {
                    if (xa !== xb || ya !== yb) {
                      var i = s.push(pop(s) + "scale(", null, ",", null, ")");
                      q.push({i: i - 4, x: interpolateNumber(xa, xb)}, {i: i - 2, x: interpolateNumber(ya, yb)});
                    } else if (xb !== 1 || yb !== 1) {
                      s.push(pop(s) + "scale(" + xb + "," + yb + ")");
                    }
                  }

                  return function(a, b) {
                    var s = [], // string constants and placeholders
                        q = []; // number interpolators
                    a = parse(a), b = parse(b);
                    translate(a.translateX, a.translateY, b.translateX, b.translateY, s, q);
                    rotate(a.rotate, b.rotate, s, q);
                    skewX(a.skewX, b.skewX, s, q);
                    scale(a.scaleX, a.scaleY, b.scaleX, b.scaleY, s, q);
                    a = b = null; // gc
                    return function(t) {
                      var i = -1, n = q.length, o;
                      while (++i < n) s[(o = q[i]).i] = o.x(t);
                      return s.join("");
                    };
                  };
                }

                var interpolateTransformCss = interpolateTransform(parseCss, "px, ", "px)", "deg)");
                var interpolateTransformSvg = interpolateTransform(parseSvg, ", ", ")", ")");

                var rho = Math.SQRT2;
                var rho2 = 2;
                var rho4 = 4;
                var epsilon2 = 1e-12;

                function cosh(x) {
                  return ((x = Math.exp(x)) + 1 / x) / 2;
                }

                function sinh(x) {
                  return ((x = Math.exp(x)) - 1 / x) / 2;
                }

                function tanh(x) {
                  return ((x = Math.exp(2 * x)) - 1) / (x + 1);
                }

                // p0 = [ux0, uy0, w0]
                // p1 = [ux1, uy1, w1]
                var interpolateZoom = function(p0, p1) {
                  var ux0 = p0[0], uy0 = p0[1], w0 = p0[2],
                      ux1 = p1[0], uy1 = p1[1], w1 = p1[2],
                      dx = ux1 - ux0,
                      dy = uy1 - uy0,
                      d2 = dx * dx + dy * dy,
                      i,
                      S;

                  // Special case for u0 ≅ u1.
                  if (d2 < epsilon2) {
                    S = Math.log(w1 / w0) / rho;
                    i = function(t) {
                      return [
                        ux0 + t * dx,
                        uy0 + t * dy,
                        w0 * Math.exp(rho * t * S)
                      ];
                    };
                  }

                  // General case.
                  else {
                    var d1 = Math.sqrt(d2),
                        b0 = (w1 * w1 - w0 * w0 + rho4 * d2) / (2 * w0 * rho2 * d1),
                        b1 = (w1 * w1 - w0 * w0 - rho4 * d2) / (2 * w1 * rho2 * d1),
                        r0 = Math.log(Math.sqrt(b0 * b0 + 1) - b0),
                        r1 = Math.log(Math.sqrt(b1 * b1 + 1) - b1);
                    S = (r1 - r0) / rho;
                    i = function(t) {
                      var s = t * S,
                          coshr0 = cosh(r0),
                          u = w0 / (rho2 * d1) * (coshr0 * tanh(rho * s + r0) - sinh(r0));
                      return [
                        ux0 + u * dx,
                        uy0 + u * dy,
                        w0 * coshr0 / cosh(rho * s + r0)
                      ];
                    };
                  }

                  i.duration = S * 1000;

                  return i;
                };

                function hsl$1(hue$$1) {
                  return function(start, end) {
                    var h = hue$$1((start = hsl(start)).h, (end = hsl(end)).h),
                        s = nogamma(start.s, end.s),
                        l = nogamma(start.l, end.l),
                        opacity = nogamma(start.opacity, end.opacity);
                    return function(t) {
                      start.h = h(t);
                      start.s = s(t);
                      start.l = l(t);
                      start.opacity = opacity(t);
                      return start + "";
                    };
                  }
                }

                var hsl$2 = hsl$1(hue);
                var hslLong = hsl$1(nogamma);

                function lab$1(start, end) {
                  var l = nogamma((start = lab(start)).l, (end = lab(end)).l),
                      a = nogamma(start.a, end.a),
                      b = nogamma(start.b, end.b),
                      opacity = nogamma(start.opacity, end.opacity);
                  return function(t) {
                    start.l = l(t);
                    start.a = a(t);
                    start.b = b(t);
                    start.opacity = opacity(t);
                    return start + "";
                  };
                }

                function hcl$1(hue$$1) {
                  return function(start, end) {
                    var h = hue$$1((start = hcl(start)).h, (end = hcl(end)).h),
                        c = nogamma(start.c, end.c),
                        l = nogamma(start.l, end.l),
                        opacity = nogamma(start.opacity, end.opacity);
                    return function(t) {
                      start.h = h(t);
                      start.c = c(t);
                      start.l = l(t);
                      start.opacity = opacity(t);
                      return start + "";
                    };
                  }
                }

                var hcl$2 = hcl$1(hue);
                var hclLong = hcl$1(nogamma);

                function cubehelix$1(hue$$1) {
                  return (function cubehelixGamma(y) {
                    y = +y;

                    function cubehelix$$1(start, end) {
                      var h = hue$$1((start = cubehelix(start)).h, (end = cubehelix(end)).h),
                          s = nogamma(start.s, end.s),
                          l = nogamma(start.l, end.l),
                          opacity = nogamma(start.opacity, end.opacity);
                      return function(t) {
                        start.h = h(t);
                        start.s = s(t);
                        start.l = l(Math.pow(t, y));
                        start.opacity = opacity(t);
                        return start + "";
                      };
                    }

                    cubehelix$$1.gamma = cubehelixGamma;

                    return cubehelix$$1;
                  })(1);
                }

                var cubehelix$2 = cubehelix$1(hue);
                var cubehelixLong = cubehelix$1(nogamma);

                var quantize = function(interpolator, n) {
                  var samples = new Array(n);
                  for (var i = 0; i < n; ++i) samples[i] = interpolator(i / (n - 1));
                  return samples;
                };

                var noop$1 = {value: function() {}};

                function dispatch() {
                  for (var i = 0, n = arguments.length, _ = {}, t; i < n; ++i) {
                    if (!(t = arguments[i] + "") || (t in _)) throw new Error("illegal type: " + t);
                    _[t] = [];
                  }
                  return new Dispatch(_);
                }

                function Dispatch(_) {
                  this._ = _;
                }

                function parseTypenames(typenames, types) {
                  return typenames.trim().split(/^|\s+/).map(function(t) {
                    var name = "", i = t.indexOf(".");
                    if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);
                    if (t && !types.hasOwnProperty(t)) throw new Error("unknown type: " + t);
                    return {type: t, name: name};
                  });
                }

                Dispatch.prototype = dispatch.prototype = {
                  constructor: Dispatch,
                  on: function(typename, callback) {
                    var _ = this._,
                        T = parseTypenames(typename + "", _),
                        t,
                        i = -1,
                        n = T.length;

                    // If no callback was specified, return the callback of the given type and name.
                    if (arguments.length < 2) {
                      while (++i < n) if ((t = (typename = T[i]).type) && (t = get(_[t], typename.name))) return t;
                      return;
                    }

                    // If a type was specified, set the callback for the given type and name.
                    // Otherwise, if a null callback was specified, remove callbacks of the given name.
                    if (callback != null && typeof callback !== "function") throw new Error("invalid callback: " + callback);
                    while (++i < n) {
                      if (t = (typename = T[i]).type) _[t] = set$2(_[t], typename.name, callback);
                      else if (callback == null) for (t in _) _[t] = set$2(_[t], typename.name, null);
                    }

                    return this;
                  },
                  copy: function() {
                    var copy = {}, _ = this._;
                    for (var t in _) copy[t] = _[t].slice();
                    return new Dispatch(copy);
                  },
                  call: function(type, that) {
                    if ((n = arguments.length - 2) > 0) for (var args = new Array(n), i = 0, n, t; i < n; ++i) args[i] = arguments[i + 2];
                    if (!this._.hasOwnProperty(type)) throw new Error("unknown type: " + type);
                    for (t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);
                  },
                  apply: function(type, that, args) {
                    if (!this._.hasOwnProperty(type)) throw new Error("unknown type: " + type);
                    for (var t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);
                  }
                };

                function get(type, name) {
                  for (var i = 0, n = type.length, c; i < n; ++i) {
                    if ((c = type[i]).name === name) {
                      return c.value;
                    }
                  }
                }

                function set$2(type, name, callback) {
                  for (var i = 0, n = type.length; i < n; ++i) {
                    if (type[i].name === name) {
                      type[i] = noop$1, type = type.slice(0, i).concat(type.slice(i + 1));
                      break;
                    }
                  }
                  if (callback != null) type.push({name: name, value: callback});
                  return type;
                }

                function objectConverter(columns) {
                  return new Function("d", "return {" + columns.map(function(name, i) {
                    return JSON.stringify(name) + ": d[" + i + "]";
                  }).join(",") + "}");
                }

                function customConverter(columns, f) {
                  var object = objectConverter(columns);
                  return function(row, i) {
                    return f(object(row), i, columns);
                  };
                }

                // Compute unique columns in order of discovery.
                function inferColumns(rows) {
                  var columnSet = Object.create(null),
                      columns = [];

                  rows.forEach(function(row) {
                    for (var column in row) {
                      if (!(column in columnSet)) {
                        columns.push(columnSet[column] = column);
                      }
                    }
                  });

                  return columns;
                }

                var dsv = function(delimiter) {
                  var reFormat = new RegExp("[\"" + delimiter + "\n]"),
                      delimiterCode = delimiter.charCodeAt(0);

                  function parse(text, f) {
                    var convert, columns, rows = parseRows(text, function(row, i) {
                      if (convert) return convert(row, i - 1);
                      columns = row, convert = f ? customConverter(row, f) : objectConverter(row);
                    });
                    rows.columns = columns;
                    return rows;
                  }

                  function parseRows(text, f) {
                    var EOL = {}, // sentinel value for end-of-line
                        EOF = {}, // sentinel value for end-of-file
                        rows = [], // output rows
                        N = text.length,
                        I = 0, // current character index
                        n = 0, // the current line number
                        t, // the current token
                        eol; // is the current token followed by EOL?

                    function token() {
                      if (I >= N) return EOF; // special case: end of file
                      if (eol) return eol = false, EOL; // special case: end of line

                      // special case: quotes
                      var j = I, c;
                      if (text.charCodeAt(j) === 34) {
                        var i = j;
                        while (i++ < N) {
                          if (text.charCodeAt(i) === 34) {
                            if (text.charCodeAt(i + 1) !== 34) break;
                            ++i;
                          }
                        }
                        I = i + 2;
                        c = text.charCodeAt(i + 1);
                        if (c === 13) {
                          eol = true;
                          if (text.charCodeAt(i + 2) === 10) ++I;
                        } else if (c === 10) {
                          eol = true;
                        }
                        return text.slice(j + 1, i).replace(/""/g, "\"");
                      }

                      // common case: find next delimiter or newline
                      while (I < N) {
                        var k = 1;
                        c = text.charCodeAt(I++);
                        if (c === 10) eol = true; // \n
                        else if (c === 13) { eol = true; if (text.charCodeAt(I) === 10) ++I, ++k; } // \r|\r\n
                        else if (c !== delimiterCode) continue;
                        return text.slice(j, I - k);
                      }

                      // special case: last token before EOF
                      return text.slice(j);
                    }

                    while ((t = token()) !== EOF) {
                      var a = [];
                      while (t !== EOL && t !== EOF) {
                        a.push(t);
                        t = token();
                      }
                      if (f && (a = f(a, n++)) == null) continue;
                      rows.push(a);
                    }

                    return rows;
                  }

                  function format(rows, columns) {
                    if (columns == null) columns = inferColumns(rows);
                    return [columns.map(formatValue).join(delimiter)].concat(rows.map(function(row) {
                      return columns.map(function(column) {
                        return formatValue(row[column]);
                      }).join(delimiter);
                    })).join("\n");
                  }

                  function formatRows(rows) {
                    return rows.map(formatRow).join("\n");
                  }

                  function formatRow(row) {
                    return row.map(formatValue).join(delimiter);
                  }

                  function formatValue(text) {
                    return text == null ? ""
                        : reFormat.test(text += "") ? "\"" + text.replace(/\"/g, "\"\"") + "\""
                        : text;
                  }

                  return {
                    parse: parse,
                    parseRows: parseRows,
                    format: format,
                    formatRows: formatRows
                  };
                };

                var csv = dsv(",");

                var csvParse = csv.parse;
                var csvParseRows = csv.parseRows;
                var csvFormat = csv.format;
                var csvFormatRows = csv.formatRows;

                var tsv = dsv("\t");

                var tsvParse = tsv.parse;
                var tsvParseRows = tsv.parseRows;
                var tsvFormat = tsv.format;
                var tsvFormatRows = tsv.formatRows;

                var request = function(url, callback) {
                  var request,
                      event = dispatch("beforesend", "progress", "load", "error"),
                      mimeType,
                      headers = map$1(),
                      xhr = new XMLHttpRequest,
                      user = null,
                      password = null,
                      response,
                      responseType,
                      timeout = 0;

                  // If IE does not support CORS, use XDomainRequest.
                  if (typeof XDomainRequest !== "undefined"
                      && !("withCredentials" in xhr)
                      && /^(http(s)?:)?\/\//.test(url)) xhr = new XDomainRequest;

                  "onload" in xhr
                      ? xhr.onload = xhr.onerror = xhr.ontimeout = respond
                      : xhr.onreadystatechange = function(o) { xhr.readyState > 3 && respond(o); };

                  function respond(o) {
                    var status = xhr.status, result;
                    if (!status && hasResponse(xhr)
                        || status >= 200 && status < 300
                        || status === 304) {
                      if (response) {
                        try {
                          result = response.call(request, xhr);
                        } catch (e) {
                          event.call("error", request, e);
                          return;
                        }
                      } else {
                        result = xhr;
                      }
                      event.call("load", request, result);
                    } else {
                      event.call("error", request, o);
                    }
                  }

                  xhr.onprogress = function(e) {
                    event.call("progress", request, e);
                  };

                  request = {
                    header: function(name, value) {
                      name = (name + "").toLowerCase();
                      if (arguments.length < 2) return headers.get(name);
                      if (value == null) headers.remove(name);
                      else headers.set(name, value + "");
                      return request;
                    },

                    // If mimeType is non-null and no Accept header is set, a default is used.
                    mimeType: function(value) {
                      if (!arguments.length) return mimeType;
                      mimeType = value == null ? null : value + "";
                      return request;
                    },

                    // Specifies what type the response value should take;
                    // for instance, arraybuffer, blob, document, or text.
                    responseType: function(value) {
                      if (!arguments.length) return responseType;
                      responseType = value;
                      return request;
                    },

                    timeout: function(value) {
                      if (!arguments.length) return timeout;
                      timeout = +value;
                      return request;
                    },

                    user: function(value) {
                      return arguments.length < 1 ? user : (user = value == null ? null : value + "", request);
                    },

                    password: function(value) {
                      return arguments.length < 1 ? password : (password = value == null ? null : value + "", request);
                    },

                    // Specify how to convert the response content to a specific type;
                    // changes the callback value on "load" events.
                    response: function(value) {
                      response = value;
                      return request;
                    },

                    // Alias for send("GET", …).
                    get: function(data, callback) {
                      return request.send("GET", data, callback);
                    },

                    // Alias for send("POST", …).
                    post: function(data, callback) {
                      return request.send("POST", data, callback);
                    },

                    // If callback is non-null, it will be used for error and load events.
                    send: function(method, data, callback) {
                      xhr.open(method, url, true, user, password);
                      if (mimeType != null && !headers.has("accept")) headers.set("accept", mimeType + ",*/*");
                      if (xhr.setRequestHeader) headers.each(function(value, name) { xhr.setRequestHeader(name, value); });
                      if (mimeType != null && xhr.overrideMimeType) xhr.overrideMimeType(mimeType);
                      if (responseType != null) xhr.responseType = responseType;
                      if (timeout > 0) xhr.timeout = timeout;
                      if (callback == null && typeof data === "function") callback = data, data = null;
                      if (callback != null && callback.length === 1) callback = fixCallback(callback);
                      if (callback != null) request.on("error", callback).on("load", function(xhr) { callback(null, xhr); });
                      event.call("beforesend", request, xhr);
                      xhr.send(data == null ? null : data);
                      return request;
                    },

                    abort: function() {
                      xhr.abort();
                      return request;
                    },

                    on: function() {
                      var value = event.on.apply(event, arguments);
                      return value === event ? request : value;
                    }
                  };

                  if (callback != null) {
                    if (typeof callback !== "function") throw new Error("invalid callback: " + callback);
                    return request.get(callback);
                  }

                  return request;
                };

                function fixCallback(callback) {
                  return function(error, xhr) {
                    callback(error == null ? xhr : null);
                  };
                }

                function hasResponse(xhr) {
                  var type = xhr.responseType;
                  return type && type !== "text"
                      ? xhr.response // null on error
                      : xhr.responseText; // "" on error
                }

                var type = function(defaultMimeType, response) {
                  return function(url, callback) {
                    var r = request(url).mimeType(defaultMimeType).response(response);
                    if (callback != null) {
                      if (typeof callback !== "function") throw new Error("invalid callback: " + callback);
                      return r.get(callback);
                    }
                    return r;
                  };
                };

                var html = type("text/html", function(xhr) {
                  return document.createRange().createContextualFragment(xhr.responseText);
                });

                var json = type("application/json", function(xhr) {
                  return JSON.parse(xhr.responseText);
                });

                var text = type("text/plain", function(xhr) {
                  return xhr.responseText;
                });

                var xml = type("application/xml", function(xhr) {
                  var xml = xhr.responseXML;
                  if (!xml) throw new Error("parse error");
                  return xml;
                });

                var dsv$1 = function(defaultMimeType, parse) {
                  return function(url, row, callback) {
                    if (arguments.length < 3) callback = row, row = null;
                    var r = request(url).mimeType(defaultMimeType);
                    r.row = function(_) { return arguments.length ? r.response(responseOf(parse, row = _)) : row; };
                    r.row(row);
                    return callback ? r.get(callback) : r;
                  };
                };

                function responseOf(parse, row) {
                  return function(request$$1) {
                    return parse(request$$1.responseText, row);
                  };
                }

                var csv$1 = dsv$1("text/csv", csvParse);

                var tsv$1 = dsv$1("text/tab-separated-values", tsvParse);

                var frame = 0;
                var timeout = 0;
                var interval = 0;
                var pokeDelay = 1000;
                var taskHead;
                var taskTail;
                var clockLast = 0;
                var clockNow = 0;
                var clockSkew = 0;
                var clock = typeof performance === "object" && performance.now ? performance : Date;
                var setFrame = typeof requestAnimationFrame === "function" ? requestAnimationFrame : function(f) { setTimeout(f, 17); };

                function now() {
                  return clockNow || (setFrame(clearNow), clockNow = clock.now() + clockSkew);
                }

                function clearNow() {
                  clockNow = 0;
                }

                function Timer() {
                  this._call =
                  this._time =
                  this._next = null;
                }

                Timer.prototype = timer.prototype = {
                  constructor: Timer,
                  restart: function(callback, delay, time) {
                    if (typeof callback !== "function") throw new TypeError("callback is not a function");
                    time = (time == null ? now() : +time) + (delay == null ? 0 : +delay);
                    if (!this._next && taskTail !== this) {
                      if (taskTail) taskTail._next = this;
                      else taskHead = this;
                      taskTail = this;
                    }
                    this._call = callback;
                    this._time = time;
                    sleep();
                  },
                  stop: function() {
                    if (this._call) {
                      this._call = null;
                      this._time = Infinity;
                      sleep();
                    }
                  }
                };

                function timer(callback, delay, time) {
                  var t = new Timer;
                  t.restart(callback, delay, time);
                  return t;
                }

                function timerFlush() {
                  now(); // Get the current time, if not already set.
                  ++frame; // Pretend we’ve set an alarm, if we haven’t already.
                  var t = taskHead, e;
                  while (t) {
                    if ((e = clockNow - t._time) >= 0) t._call.call(null, e);
                    t = t._next;
                  }
                  --frame;
                }

                function wake() {
                  clockNow = (clockLast = clock.now()) + clockSkew;
                  frame = timeout = 0;
                  try {
                    timerFlush();
                  } finally {
                    frame = 0;
                    nap();
                    clockNow = 0;
                  }
                }

                function poke$1() {
                  var now = clock.now(), delay = now - clockLast;
                  if (delay > pokeDelay) clockSkew -= delay, clockLast = now;
                }

                function nap() {
                  var t0, t1 = taskHead, t2, time = Infinity;
                  while (t1) {
                    if (t1._call) {
                      if (time > t1._time) time = t1._time;
                      t0 = t1, t1 = t1._next;
                    } else {
                      t2 = t1._next, t1._next = null;
                      t1 = t0 ? t0._next = t2 : taskHead = t2;
                    }
                  }
                  taskTail = t0;
                  sleep(time);
                }

                function sleep(time) {
                  if (frame) return; // Soonest alarm already set, or will be.
                  if (timeout) timeout = clearTimeout(timeout);
                  var delay = time - clockNow;
                  if (delay > 24) {
                    if (time < Infinity) timeout = setTimeout(wake, delay);
                    if (interval) interval = clearInterval(interval);
                  } else {
                    if (!interval) interval = setInterval(poke$1, pokeDelay);
                    frame = 1, setFrame(wake);
                  }
                }

                var timeout$1 = function(callback, delay, time) {
                  var t = new Timer;
                  delay = delay == null ? 0 : +delay;
                  t.restart(function(elapsed) {
                    t.stop();
                    callback(elapsed + delay);
                  }, delay, time);
                  return t;
                };

                var interval$1 = function(callback, delay, time) {
                  var t = new Timer, total = delay;
                  if (delay == null) return t.restart(callback, delay, time), t;
                  delay = +delay, time = time == null ? now() : +time;
                  t.restart(function tick(elapsed) {
                    elapsed += total;
                    t.restart(tick, total += delay, time);
                    callback(elapsed);
                  }, delay, time);
                  return t;
                };

                var t0$1 = new Date;
                var t1$1 = new Date;

                function newInterval(floori, offseti, count, field) {

                  function interval(date) {
                    return floori(date = new Date(+date)), date;
                  }

                  interval.floor = interval;

                  interval.ceil = function(date) {
                    return floori(date = new Date(date - 1)), offseti(date, 1), floori(date), date;
                  };

                  interval.round = function(date) {
                    var d0 = interval(date),
                        d1 = interval.ceil(date);
                    return date - d0 < d1 - date ? d0 : d1;
                  };

                  interval.offset = function(date, step) {
                    return offseti(date = new Date(+date), step == null ? 1 : Math.floor(step)), date;
                  };

                  interval.range = function(start, stop, step) {
                    var range = [];
                    start = interval.ceil(start);
                    step = step == null ? 1 : Math.floor(step);
                    if (!(start < stop) || !(step > 0)) return range; // also handles Invalid Date
                    do range.push(new Date(+start)); while (offseti(start, step), floori(start), start < stop)
                    return range;
                  };

                  interval.filter = function(test) {
                    return newInterval(function(date) {
                      if (date >= date) while (floori(date), !test(date)) date.setTime(date - 1);
                    }, function(date, step) {
                      if (date >= date) while (--step >= 0) while (offseti(date, 1), !test(date)) {} // eslint-disable-line no-empty
                    });
                  };

                  if (count) {
                    interval.count = function(start, end) {
                      t0$1.setTime(+start), t1$1.setTime(+end);
                      floori(t0$1), floori(t1$1);
                      return Math.floor(count(t0$1, t1$1));
                    };

                    interval.every = function(step) {
                      step = Math.floor(step);
                      return !isFinite(step) || !(step > 0) ? null
                          : !(step > 1) ? interval
                          : interval.filter(field
                              ? function(d) { return field(d) % step === 0; }
                              : function(d) { return interval.count(0, d) % step === 0; });
                    };
                  }

                  return interval;
                }

                var millisecond = newInterval(function() {
                  // noop
                }, function(date, step) {
                  date.setTime(+date + step);
                }, function(start, end) {
                  return end - start;
                });

                // An optimized implementation for this simple case.
                millisecond.every = function(k) {
                  k = Math.floor(k);
                  if (!isFinite(k) || !(k > 0)) return null;
                  if (!(k > 1)) return millisecond;
                  return newInterval(function(date) {
                    date.setTime(Math.floor(date / k) * k);
                  }, function(date, step) {
                    date.setTime(+date + step * k);
                  }, function(start, end) {
                    return (end - start) / k;
                  });
                };

                var milliseconds = millisecond.range;

                var durationSecond = 1e3;
                var durationMinute = 6e4;
                var durationHour = 36e5;
                var durationDay = 864e5;
                var durationWeek = 6048e5;

                var second = newInterval(function(date) {
                  date.setTime(Math.floor(date / durationSecond) * durationSecond);
                }, function(date, step) {
                  date.setTime(+date + step * durationSecond);
                }, function(start, end) {
                  return (end - start) / durationSecond;
                }, function(date) {
                  return date.getUTCSeconds();
                });

                var seconds = second.range;

                var minute = newInterval(function(date) {
                  date.setTime(Math.floor(date / durationMinute) * durationMinute);
                }, function(date, step) {
                  date.setTime(+date + step * durationMinute);
                }, function(start, end) {
                  return (end - start) / durationMinute;
                }, function(date) {
                  return date.getMinutes();
                });

                var minutes = minute.range;

                var hour = newInterval(function(date) {
                  var offset = date.getTimezoneOffset() * durationMinute % durationHour;
                  if (offset < 0) offset += durationHour;
                  date.setTime(Math.floor((+date - offset) / durationHour) * durationHour + offset);
                }, function(date, step) {
                  date.setTime(+date + step * durationHour);
                }, function(start, end) {
                  return (end - start) / durationHour;
                }, function(date) {
                  return date.getHours();
                });

                var hours = hour.range;

                var day = newInterval(function(date) {
                  date.setHours(0, 0, 0, 0);
                }, function(date, step) {
                  date.setDate(date.getDate() + step);
                }, function(start, end) {
                  return (end - start - (end.getTimezoneOffset() - start.getTimezoneOffset()) * durationMinute) / durationDay;
                }, function(date) {
                  return date.getDate() - 1;
                });

                var days = day.range;

                function weekday(i) {
                  return newInterval(function(date) {
                    date.setDate(date.getDate() - (date.getDay() + 7 - i) % 7);
                    date.setHours(0, 0, 0, 0);
                  }, function(date, step) {
                    date.setDate(date.getDate() + step * 7);
                  }, function(start, end) {
                    return (end - start - (end.getTimezoneOffset() - start.getTimezoneOffset()) * durationMinute) / durationWeek;
                  });
                }

                var sunday = weekday(0);
                var monday = weekday(1);
                var tuesday = weekday(2);
                var wednesday = weekday(3);
                var thursday = weekday(4);
                var friday = weekday(5);
                var saturday = weekday(6);

                var sundays = sunday.range;
                var mondays = monday.range;
                var tuesdays = tuesday.range;
                var wednesdays = wednesday.range;
                var thursdays = thursday.range;
                var fridays = friday.range;
                var saturdays = saturday.range;

                var month = newInterval(function(date) {
                  date.setDate(1);
                  date.setHours(0, 0, 0, 0);
                }, function(date, step) {
                  date.setMonth(date.getMonth() + step);
                }, function(start, end) {
                  return end.getMonth() - start.getMonth() + (end.getFullYear() - start.getFullYear()) * 12;
                }, function(date) {
                  return date.getMonth();
                });

                var months = month.range;

                var year = newInterval(function(date) {
                  date.setMonth(0, 1);
                  date.setHours(0, 0, 0, 0);
                }, function(date, step) {
                  date.setFullYear(date.getFullYear() + step);
                }, function(start, end) {
                  return end.getFullYear() - start.getFullYear();
                }, function(date) {
                  return date.getFullYear();
                });

                // An optimized implementation for this simple case.
                year.every = function(k) {
                  return !isFinite(k = Math.floor(k)) || !(k > 0) ? null : newInterval(function(date) {
                    date.setFullYear(Math.floor(date.getFullYear() / k) * k);
                    date.setMonth(0, 1);
                    date.setHours(0, 0, 0, 0);
                  }, function(date, step) {
                    date.setFullYear(date.getFullYear() + step * k);
                  });
                };

                var years = year.range;

                var utcMinute = newInterval(function(date) {
                  date.setUTCSeconds(0, 0);
                }, function(date, step) {
                  date.setTime(+date + step * durationMinute);
                }, function(start, end) {
                  return (end - start) / durationMinute;
                }, function(date) {
                  return date.getUTCMinutes();
                });

                var utcMinutes = utcMinute.range;

                var utcHour = newInterval(function(date) {
                  date.setUTCMinutes(0, 0, 0);
                }, function(date, step) {
                  date.setTime(+date + step * durationHour);
                }, function(start, end) {
                  return (end - start) / durationHour;
                }, function(date) {
                  return date.getUTCHours();
                });

                var utcHours = utcHour.range;

                var utcDay = newInterval(function(date) {
                  date.setUTCHours(0, 0, 0, 0);
                }, function(date, step) {
                  date.setUTCDate(date.getUTCDate() + step);
                }, function(start, end) {
                  return (end - start) / durationDay;
                }, function(date) {
                  return date.getUTCDate() - 1;
                });

                var utcDays = utcDay.range;

                function utcWeekday(i) {
                  return newInterval(function(date) {
                    date.setUTCDate(date.getUTCDate() - (date.getUTCDay() + 7 - i) % 7);
                    date.setUTCHours(0, 0, 0, 0);
                  }, function(date, step) {
                    date.setUTCDate(date.getUTCDate() + step * 7);
                  }, function(start, end) {
                    return (end - start) / durationWeek;
                  });
                }

                var utcSunday = utcWeekday(0);
                var utcMonday = utcWeekday(1);
                var utcTuesday = utcWeekday(2);
                var utcWednesday = utcWeekday(3);
                var utcThursday = utcWeekday(4);
                var utcFriday = utcWeekday(5);
                var utcSaturday = utcWeekday(6);

                var utcSundays = utcSunday.range;
                var utcMondays = utcMonday.range;
                var utcTuesdays = utcTuesday.range;
                var utcWednesdays = utcWednesday.range;
                var utcThursdays = utcThursday.range;
                var utcFridays = utcFriday.range;
                var utcSaturdays = utcSaturday.range;

                var utcMonth = newInterval(function(date) {
                  date.setUTCDate(1);
                  date.setUTCHours(0, 0, 0, 0);
                }, function(date, step) {
                  date.setUTCMonth(date.getUTCMonth() + step);
                }, function(start, end) {
                  return end.getUTCMonth() - start.getUTCMonth() + (end.getUTCFullYear() - start.getUTCFullYear()) * 12;
                }, function(date) {
                  return date.getUTCMonth();
                });

                var utcMonths = utcMonth.range;

                var utcYear = newInterval(function(date) {
                  date.setUTCMonth(0, 1);
                  date.setUTCHours(0, 0, 0, 0);
                }, function(date, step) {
                  date.setUTCFullYear(date.getUTCFullYear() + step);
                }, function(start, end) {
                  return end.getUTCFullYear() - start.getUTCFullYear();
                }, function(date) {
                  return date.getUTCFullYear();
                });

                // An optimized implementation for this simple case.
                utcYear.every = function(k) {
                  return !isFinite(k = Math.floor(k)) || !(k > 0) ? null : newInterval(function(date) {
                    date.setUTCFullYear(Math.floor(date.getUTCFullYear() / k) * k);
                    date.setUTCMonth(0, 1);
                    date.setUTCHours(0, 0, 0, 0);
                  }, function(date, step) {
                    date.setUTCFullYear(date.getUTCFullYear() + step * k);
                  });
                };

                var utcYears = utcYear.range;

                // Computes the decimal coefficient and exponent of the specified number x with
                // significant digits p, where x is positive and p is in [1, 21] or undefined.
                // For example, formatDecimal(1.23) returns ["123", 0].
                var formatDecimal = function(x, p) {
                  if ((i = (x = p ? x.toExponential(p - 1) : x.toExponential()).indexOf("e")) < 0) return null; // NaN, ±Infinity
                  var i, coefficient = x.slice(0, i);

                  // The string returned by toExponential either has the form \d\.\d+e[-+]\d+
                  // (e.g., 1.2e+3) or the form \de[-+]\d+ (e.g., 1e+3).
                  return [
                    coefficient.length > 1 ? coefficient[0] + coefficient.slice(2) : coefficient,
                    +x.slice(i + 1)
                  ];
                };

                var exponent$1 = function(x) {
                  return x = formatDecimal(Math.abs(x)), x ? x[1] : NaN;
                };

                var formatGroup = function(grouping, thousands) {
                  return function(value, width) {
                    var i = value.length,
                        t = [],
                        j = 0,
                        g = grouping[0],
                        length = 0;

                    while (i > 0 && g > 0) {
                      if (length + g + 1 > width) g = Math.max(1, width - length);
                      t.push(value.substring(i -= g, i + g));
                      if ((length += g + 1) > width) break;
                      g = grouping[j = (j + 1) % grouping.length];
                    }

                    return t.reverse().join(thousands);
                  };
                };

                var formatDefault = function(x, p) {
                  x = x.toPrecision(p);

                  out: for (var n = x.length, i = 1, i0 = -1, i1; i < n; ++i) {
                    switch (x[i]) {
                      case ".": i0 = i1 = i; break;
                      case "0": if (i0 === 0) i0 = i; i1 = i; break;
                      case "e": break out;
                      default: if (i0 > 0) i0 = 0; break;
                    }
                  }

                  return i0 > 0 ? x.slice(0, i0) + x.slice(i1 + 1) : x;
                };

                var prefixExponent;

                var formatPrefixAuto = function(x, p) {
                  var d = formatDecimal(x, p);
                  if (!d) return x + "";
                  var coefficient = d[0],
                      exponent = d[1],
                      i = exponent - (prefixExponent = Math.max(-8, Math.min(8, Math.floor(exponent / 3))) * 3) + 1,
                      n = coefficient.length;
                  return i === n ? coefficient
                      : i > n ? coefficient + new Array(i - n + 1).join("0")
                      : i > 0 ? coefficient.slice(0, i) + "." + coefficient.slice(i)
                      : "0." + new Array(1 - i).join("0") + formatDecimal(x, Math.max(0, p + i - 1))[0]; // less than 1y!
                };

                var formatRounded = function(x, p) {
                  var d = formatDecimal(x, p);
                  if (!d) return x + "";
                  var coefficient = d[0],
                      exponent = d[1];
                  return exponent < 0 ? "0." + new Array(-exponent).join("0") + coefficient
                      : coefficient.length > exponent + 1 ? coefficient.slice(0, exponent + 1) + "." + coefficient.slice(exponent + 1)
                      : coefficient + new Array(exponent - coefficient.length + 2).join("0");
                };

                var formatTypes = {
                  "": formatDefault,
                  "%": function(x, p) { return (x * 100).toFixed(p); },
                  "b": function(x) { return Math.round(x).toString(2); },
                  "c": function(x) { return x + ""; },
                  "d": function(x) { return Math.round(x).toString(10); },
                  "e": function(x, p) { return x.toExponential(p); },
                  "f": function(x, p) { return x.toFixed(p); },
                  "g": function(x, p) { return x.toPrecision(p); },
                  "o": function(x) { return Math.round(x).toString(8); },
                  "p": function(x, p) { return formatRounded(x * 100, p); },
                  "r": formatRounded,
                  "s": formatPrefixAuto,
                  "X": function(x) { return Math.round(x).toString(16).toUpperCase(); },
                  "x": function(x) { return Math.round(x).toString(16); }
                };

                // [[fill]align][sign][symbol][0][width][,][.precision][type]
                var re = /^(?:(.)?([<>=^]))?([+\-\( ])?([$#])?(0)?(\d+)?(,)?(\.\d+)?([a-z%])?$/i;

                var formatSpecifier = function(specifier) {
                  return new FormatSpecifier(specifier);
                };

                function FormatSpecifier(specifier) {
                  if (!(match = re.exec(specifier))) throw new Error("invalid format: " + specifier);

                  var match,
                      fill = match[1] || " ",
                      align = match[2] || ">",
                      sign = match[3] || "-",
                      symbol = match[4] || "",
                      zero = !!match[5],
                      width = match[6] && +match[6],
                      comma = !!match[7],
                      precision = match[8] && +match[8].slice(1),
                      type = match[9] || "";

                  // The "n" type is an alias for ",g".
                  if (type === "n") comma = true, type = "g";

                  // Map invalid types to the default format.
                  else if (!formatTypes[type]) type = "";

                  // If zero fill is specified, padding goes after sign and before digits.
                  if (zero || (fill === "0" && align === "=")) zero = true, fill = "0", align = "=";

                  this.fill = fill;
                  this.align = align;
                  this.sign = sign;
                  this.symbol = symbol;
                  this.zero = zero;
                  this.width = width;
                  this.comma = comma;
                  this.precision = precision;
                  this.type = type;
                }

                FormatSpecifier.prototype.toString = function() {
                  return this.fill
                      + this.align
                      + this.sign
                      + this.symbol
                      + (this.zero ? "0" : "")
                      + (this.width == null ? "" : Math.max(1, this.width | 0))
                      + (this.comma ? "," : "")
                      + (this.precision == null ? "" : "." + Math.max(0, this.precision | 0))
                      + this.type;
                };

                var prefixes = ["y","z","a","f","p","n","\xB5","m","","k","M","G","T","P","E","Z","Y"];

                function identity$3(x) {
                  return x;
                }

                var formatLocale = function(locale) {
                  var group = locale.grouping && locale.thousands ? formatGroup(locale.grouping, locale.thousands) : identity$3,
                      currency = locale.currency,
                      decimal = locale.decimal;

                  function newFormat(specifier) {
                    specifier = formatSpecifier(specifier);

                    var fill = specifier.fill,
                        align = specifier.align,
                        sign = specifier.sign,
                        symbol = specifier.symbol,
                        zero = specifier.zero,
                        width = specifier.width,
                        comma = specifier.comma,
                        precision = specifier.precision,
                        type = specifier.type;

                    // Compute the prefix and suffix.
                    // For SI-prefix, the suffix is lazily computed.
                    var prefix = symbol === "$" ? currency[0] : symbol === "#" && /[boxX]/.test(type) ? "0" + type.toLowerCase() : "",
                        suffix = symbol === "$" ? currency[1] : /[%p]/.test(type) ? "%" : "";

                    // What format function should we use?
                    // Is this an integer type?
                    // Can this type generate exponential notation?
                    var formatType = formatTypes[type],
                        maybeSuffix = !type || /[defgprs%]/.test(type);

                    // Set the default precision if not specified,
                    // or clamp the specified precision to the supported range.
                    // For significant precision, it must be in [1, 21].
                    // For fixed precision, it must be in [0, 20].
                    precision = precision == null ? (type ? 6 : 12)
                        : /[gprs]/.test(type) ? Math.max(1, Math.min(21, precision))
                        : Math.max(0, Math.min(20, precision));

                    function format(value) {
                      var valuePrefix = prefix,
                          valueSuffix = suffix,
                          i, n, c;

                      if (type === "c") {
                        valueSuffix = formatType(value) + valueSuffix;
                        value = "";
                      } else {
                        value = +value;

                        // Convert negative to positive, and compute the prefix.
                        // Note that -0 is not less than 0, but 1 / -0 is!
                        var valueNegative = (value < 0 || 1 / value < 0) && (value *= -1, true);

                        // Perform the initial formatting.
                        value = formatType(value, precision);

                        // If the original value was negative, it may be rounded to zero during
                        // formatting; treat this as (positive) zero.
                        if (valueNegative) {
                          i = -1, n = value.length;
                          valueNegative = false;
                          while (++i < n) {
                            if (c = value.charCodeAt(i), (48 < c && c < 58)
                                || (type === "x" && 96 < c && c < 103)
                                || (type === "X" && 64 < c && c < 71)) {
                              valueNegative = true;
                              break;
                            }
                          }
                        }

                        // Compute the prefix and suffix.
                        valuePrefix = (valueNegative ? (sign === "(" ? sign : "-") : sign === "-" || sign === "(" ? "" : sign) + valuePrefix;
                        valueSuffix = valueSuffix + (type === "s" ? prefixes[8 + prefixExponent / 3] : "") + (valueNegative && sign === "(" ? ")" : "");

                        // Break the formatted value into the integer “value” part that can be
                        // grouped, and fractional or exponential “suffix” part that is not.
                        if (maybeSuffix) {
                          i = -1, n = value.length;
                          while (++i < n) {
                            if (c = value.charCodeAt(i), 48 > c || c > 57) {
                              valueSuffix = (c === 46 ? decimal + value.slice(i + 1) : value.slice(i)) + valueSuffix;
                              value = value.slice(0, i);
                              break;
                            }
                          }
                        }
                      }

                      // If the fill character is not "0", grouping is applied before padding.
                      if (comma && !zero) value = group(value, Infinity);

                      // Compute the padding.
                      var length = valuePrefix.length + value.length + valueSuffix.length,
                          padding = length < width ? new Array(width - length + 1).join(fill) : "";

                      // If the fill character is "0", grouping is applied after padding.
                      if (comma && zero) value = group(padding + value, padding.length ? width - valueSuffix.length : Infinity), padding = "";

                      // Reconstruct the final output based on the desired alignment.
                      switch (align) {
                        case "<": return valuePrefix + value + valueSuffix + padding;
                        case "=": return valuePrefix + padding + value + valueSuffix;
                        case "^": return padding.slice(0, length = padding.length >> 1) + valuePrefix + value + valueSuffix + padding.slice(length);
                      }
                      return padding + valuePrefix + value + valueSuffix;
                    }

                    format.toString = function() {
                      return specifier + "";
                    };

                    return format;
                  }

                  function formatPrefix(specifier, value) {
                    var f = newFormat((specifier = formatSpecifier(specifier), specifier.type = "f", specifier)),
                        e = Math.max(-8, Math.min(8, Math.floor(exponent$1(value) / 3))) * 3,
                        k = Math.pow(10, -e),
                        prefix = prefixes[8 + e / 3];
                    return function(value) {
                      return f(k * value) + prefix;
                    };
                  }

                  return {
                    format: newFormat,
                    formatPrefix: formatPrefix
                  };
                };

                var locale$1;



                defaultLocale({
                  decimal: ".",
                  thousands: ",",
                  grouping: [3],
                  currency: ["$", ""]
                });

                function defaultLocale(definition) {
                  locale$1 = formatLocale(definition);
                  exports.format = locale$1.format;
                  exports.formatPrefix = locale$1.formatPrefix;
                  return locale$1;
                }

                var precisionFixed = function(step) {
                  return Math.max(0, -exponent$1(Math.abs(step)));
                };

                var precisionPrefix = function(step, value) {
                  return Math.max(0, Math.max(-8, Math.min(8, Math.floor(exponent$1(value) / 3))) * 3 - exponent$1(Math.abs(step)));
                };

                var precisionRound = function(step, max) {
                  step = Math.abs(step), max = Math.abs(max) - step;
                  return Math.max(0, exponent$1(max) - exponent$1(step)) + 1;
                };

                function localDate(d) {
                  if (0 <= d.y && d.y < 100) {
                    var date = new Date(-1, d.m, d.d, d.H, d.M, d.S, d.L);
                    date.setFullYear(d.y);
                    return date;
                  }
                  return new Date(d.y, d.m, d.d, d.H, d.M, d.S, d.L);
                }

                function utcDate(d) {
                  if (0 <= d.y && d.y < 100) {
                    var date = new Date(Date.UTC(-1, d.m, d.d, d.H, d.M, d.S, d.L));
                    date.setUTCFullYear(d.y);
                    return date;
                  }
                  return new Date(Date.UTC(d.y, d.m, d.d, d.H, d.M, d.S, d.L));
                }

                function newYear(y) {
                  return {y: y, m: 0, d: 1, H: 0, M: 0, S: 0, L: 0};
                }

                function formatLocale$1(locale) {
                  var locale_dateTime = locale.dateTime,
                      locale_date = locale.date,
                      locale_time = locale.time,
                      locale_periods = locale.periods,
                      locale_weekdays = locale.days,
                      locale_shortWeekdays = locale.shortDays,
                      locale_months = locale.months,
                      locale_shortMonths = locale.shortMonths;

                  var periodRe = formatRe(locale_periods),
                      periodLookup = formatLookup(locale_periods),
                      weekdayRe = formatRe(locale_weekdays),
                      weekdayLookup = formatLookup(locale_weekdays),
                      shortWeekdayRe = formatRe(locale_shortWeekdays),
                      shortWeekdayLookup = formatLookup(locale_shortWeekdays),
                      monthRe = formatRe(locale_months),
                      monthLookup = formatLookup(locale_months),
                      shortMonthRe = formatRe(locale_shortMonths),
                      shortMonthLookup = formatLookup(locale_shortMonths);

                  var formats = {
                    "a": formatShortWeekday,
                    "A": formatWeekday,
                    "b": formatShortMonth,
                    "B": formatMonth,
                    "c": null,
                    "d": formatDayOfMonth,
                    "e": formatDayOfMonth,
                    "H": formatHour24,
                    "I": formatHour12,
                    "j": formatDayOfYear,
                    "L": formatMilliseconds,
                    "m": formatMonthNumber,
                    "M": formatMinutes,
                    "p": formatPeriod,
                    "S": formatSeconds,
                    "U": formatWeekNumberSunday,
                    "w": formatWeekdayNumber,
                    "W": formatWeekNumberMonday,
                    "x": null,
                    "X": null,
                    "y": formatYear,
                    "Y": formatFullYear,
                    "Z": formatZone,
                    "%": formatLiteralPercent
                  };

                  var utcFormats = {
                    "a": formatUTCShortWeekday,
                    "A": formatUTCWeekday,
                    "b": formatUTCShortMonth,
                    "B": formatUTCMonth,
                    "c": null,
                    "d": formatUTCDayOfMonth,
                    "e": formatUTCDayOfMonth,
                    "H": formatUTCHour24,
                    "I": formatUTCHour12,
                    "j": formatUTCDayOfYear,
                    "L": formatUTCMilliseconds,
                    "m": formatUTCMonthNumber,
                    "M": formatUTCMinutes,
                    "p": formatUTCPeriod,
                    "S": formatUTCSeconds,
                    "U": formatUTCWeekNumberSunday,
                    "w": formatUTCWeekdayNumber,
                    "W": formatUTCWeekNumberMonday,
                    "x": null,
                    "X": null,
                    "y": formatUTCYear,
                    "Y": formatUTCFullYear,
                    "Z": formatUTCZone,
                    "%": formatLiteralPercent
                  };

                  var parses = {
                    "a": parseShortWeekday,
                    "A": parseWeekday,
                    "b": parseShortMonth,
                    "B": parseMonth,
                    "c": parseLocaleDateTime,
                    "d": parseDayOfMonth,
                    "e": parseDayOfMonth,
                    "H": parseHour24,
                    "I": parseHour24,
                    "j": parseDayOfYear,
                    "L": parseMilliseconds,
                    "m": parseMonthNumber,
                    "M": parseMinutes,
                    "p": parsePeriod,
                    "S": parseSeconds,
                    "U": parseWeekNumberSunday,
                    "w": parseWeekdayNumber,
                    "W": parseWeekNumberMonday,
                    "x": parseLocaleDate,
                    "X": parseLocaleTime,
                    "y": parseYear,
                    "Y": parseFullYear,
                    "Z": parseZone,
                    "%": parseLiteralPercent
                  };

                  // These recursive directive definitions must be deferred.
                  formats.x = newFormat(locale_date, formats);
                  formats.X = newFormat(locale_time, formats);
                  formats.c = newFormat(locale_dateTime, formats);
                  utcFormats.x = newFormat(locale_date, utcFormats);
                  utcFormats.X = newFormat(locale_time, utcFormats);
                  utcFormats.c = newFormat(locale_dateTime, utcFormats);

                  function newFormat(specifier, formats) {
                    return function(date) {
                      var string = [],
                          i = -1,
                          j = 0,
                          n = specifier.length,
                          c,
                          pad,
                          format;

                      if (!(date instanceof Date)) date = new Date(+date);

                      while (++i < n) {
                        if (specifier.charCodeAt(i) === 37) {
                          string.push(specifier.slice(j, i));
                          if ((pad = pads[c = specifier.charAt(++i)]) != null) c = specifier.charAt(++i);
                          else pad = c === "e" ? " " : "0";
                          if (format = formats[c]) c = format(date, pad);
                          string.push(c);
                          j = i + 1;
                        }
                      }

                      string.push(specifier.slice(j, i));
                      return string.join("");
                    };
                  }

                  function newParse(specifier, newDate) {
                    return function(string) {
                      var d = newYear(1900),
                          i = parseSpecifier(d, specifier, string += "", 0);
                      if (i != string.length) return null;

                      // The am-pm flag is 0 for AM, and 1 for PM.
                      if ("p" in d) d.H = d.H % 12 + d.p * 12;

                      // Convert day-of-week and week-of-year to day-of-year.
                      if ("W" in d || "U" in d) {
                        if (!("w" in d)) d.w = "W" in d ? 1 : 0;
                        var day$$1 = "Z" in d ? utcDate(newYear(d.y)).getUTCDay() : newDate(newYear(d.y)).getDay();
                        d.m = 0;
                        d.d = "W" in d ? (d.w + 6) % 7 + d.W * 7 - (day$$1 + 5) % 7 : d.w + d.U * 7 - (day$$1 + 6) % 7;
                      }

                      // If a time zone is specified, all fields are interpreted as UTC and then
                      // offset according to the specified time zone.
                      if ("Z" in d) {
                        d.H += d.Z / 100 | 0;
                        d.M += d.Z % 100;
                        return utcDate(d);
                      }

                      // Otherwise, all fields are in local time.
                      return newDate(d);
                    };
                  }

                  function parseSpecifier(d, specifier, string, j) {
                    var i = 0,
                        n = specifier.length,
                        m = string.length,
                        c,
                        parse;

                    while (i < n) {
                      if (j >= m) return -1;
                      c = specifier.charCodeAt(i++);
                      if (c === 37) {
                        c = specifier.charAt(i++);
                        parse = parses[c in pads ? specifier.charAt(i++) : c];
                        if (!parse || ((j = parse(d, string, j)) < 0)) return -1;
                      } else if (c != string.charCodeAt(j++)) {
                        return -1;
                      }
                    }

                    return j;
                  }

                  function parsePeriod(d, string, i) {
                    var n = periodRe.exec(string.slice(i));
                    return n ? (d.p = periodLookup[n[0].toLowerCase()], i + n[0].length) : -1;
                  }

                  function parseShortWeekday(d, string, i) {
                    var n = shortWeekdayRe.exec(string.slice(i));
                    return n ? (d.w = shortWeekdayLookup[n[0].toLowerCase()], i + n[0].length) : -1;
                  }

                  function parseWeekday(d, string, i) {
                    var n = weekdayRe.exec(string.slice(i));
                    return n ? (d.w = weekdayLookup[n[0].toLowerCase()], i + n[0].length) : -1;
                  }

                  function parseShortMonth(d, string, i) {
                    var n = shortMonthRe.exec(string.slice(i));
                    return n ? (d.m = shortMonthLookup[n[0].toLowerCase()], i + n[0].length) : -1;
                  }

                  function parseMonth(d, string, i) {
                    var n = monthRe.exec(string.slice(i));
                    return n ? (d.m = monthLookup[n[0].toLowerCase()], i + n[0].length) : -1;
                  }

                  function parseLocaleDateTime(d, string, i) {
                    return parseSpecifier(d, locale_dateTime, string, i);
                  }

                  function parseLocaleDate(d, string, i) {
                    return parseSpecifier(d, locale_date, string, i);
                  }

                  function parseLocaleTime(d, string, i) {
                    return parseSpecifier(d, locale_time, string, i);
                  }

                  function formatShortWeekday(d) {
                    return locale_shortWeekdays[d.getDay()];
                  }

                  function formatWeekday(d) {
                    return locale_weekdays[d.getDay()];
                  }

                  function formatShortMonth(d) {
                    return locale_shortMonths[d.getMonth()];
                  }

                  function formatMonth(d) {
                    return locale_months[d.getMonth()];
                  }

                  function formatPeriod(d) {
                    return locale_periods[+(d.getHours() >= 12)];
                  }

                  function formatUTCShortWeekday(d) {
                    return locale_shortWeekdays[d.getUTCDay()];
                  }

                  function formatUTCWeekday(d) {
                    return locale_weekdays[d.getUTCDay()];
                  }

                  function formatUTCShortMonth(d) {
                    return locale_shortMonths[d.getUTCMonth()];
                  }

                  function formatUTCMonth(d) {
                    return locale_months[d.getUTCMonth()];
                  }

                  function formatUTCPeriod(d) {
                    return locale_periods[+(d.getUTCHours() >= 12)];
                  }

                  return {
                    format: function(specifier) {
                      var f = newFormat(specifier += "", formats);
                      f.toString = function() { return specifier; };
                      return f;
                    },
                    parse: function(specifier) {
                      var p = newParse(specifier += "", localDate);
                      p.toString = function() { return specifier; };
                      return p;
                    },
                    utcFormat: function(specifier) {
                      var f = newFormat(specifier += "", utcFormats);
                      f.toString = function() { return specifier; };
                      return f;
                    },
                    utcParse: function(specifier) {
                      var p = newParse(specifier, utcDate);
                      p.toString = function() { return specifier; };
                      return p;
                    }
                  };
                }

                var pads = {"-": "", "_": " ", "0": "0"};
                var numberRe = /^\s*\d+/;
                var percentRe = /^%/;
                var requoteRe = /[\\\^\$\*\+\?\|\[\]\(\)\.\{\}]/g;

                function pad(value, fill, width) {
                  var sign = value < 0 ? "-" : "",
                      string = (sign ? -value : value) + "",
                      length = string.length;
                  return sign + (length < width ? new Array(width - length + 1).join(fill) + string : string);
                }

                function requote(s) {
                  return s.replace(requoteRe, "\\$&");
                }

                function formatRe(names) {
                  return new RegExp("^(?:" + names.map(requote).join("|") + ")", "i");
                }

                function formatLookup(names) {
                  var map = {}, i = -1, n = names.length;
                  while (++i < n) map[names[i].toLowerCase()] = i;
                  return map;
                }

                function parseWeekdayNumber(d, string, i) {
                  var n = numberRe.exec(string.slice(i, i + 1));
                  return n ? (d.w = +n[0], i + n[0].length) : -1;
                }

                function parseWeekNumberSunday(d, string, i) {
                  var n = numberRe.exec(string.slice(i));
                  return n ? (d.U = +n[0], i + n[0].length) : -1;
                }

                function parseWeekNumberMonday(d, string, i) {
                  var n = numberRe.exec(string.slice(i));
                  return n ? (d.W = +n[0], i + n[0].length) : -1;
                }

                function parseFullYear(d, string, i) {
                  var n = numberRe.exec(string.slice(i, i + 4));
                  return n ? (d.y = +n[0], i + n[0].length) : -1;
                }

                function parseYear(d, string, i) {
                  var n = numberRe.exec(string.slice(i, i + 2));
                  return n ? (d.y = +n[0] + (+n[0] > 68 ? 1900 : 2000), i + n[0].length) : -1;
                }

                function parseZone(d, string, i) {
                  var n = /^(Z)|([+-]\d\d)(?:\:?(\d\d))?/.exec(string.slice(i, i + 6));
                  return n ? (d.Z = n[1] ? 0 : -(n[2] + (n[3] || "00")), i + n[0].length) : -1;
                }

                function parseMonthNumber(d, string, i) {
                  var n = numberRe.exec(string.slice(i, i + 2));
                  return n ? (d.m = n[0] - 1, i + n[0].length) : -1;
                }

                function parseDayOfMonth(d, string, i) {
                  var n = numberRe.exec(string.slice(i, i + 2));
                  return n ? (d.d = +n[0], i + n[0].length) : -1;
                }

                function parseDayOfYear(d, string, i) {
                  var n = numberRe.exec(string.slice(i, i + 3));
                  return n ? (d.m = 0, d.d = +n[0], i + n[0].length) : -1;
                }

                function parseHour24(d, string, i) {
                  var n = numberRe.exec(string.slice(i, i + 2));
                  return n ? (d.H = +n[0], i + n[0].length) : -1;
                }

                function parseMinutes(d, string, i) {
                  var n = numberRe.exec(string.slice(i, i + 2));
                  return n ? (d.M = +n[0], i + n[0].length) : -1;
                }

                function parseSeconds(d, string, i) {
                  var n = numberRe.exec(string.slice(i, i + 2));
                  return n ? (d.S = +n[0], i + n[0].length) : -1;
                }

                function parseMilliseconds(d, string, i) {
                  var n = numberRe.exec(string.slice(i, i + 3));
                  return n ? (d.L = +n[0], i + n[0].length) : -1;
                }

                function parseLiteralPercent(d, string, i) {
                  var n = percentRe.exec(string.slice(i, i + 1));
                  return n ? i + n[0].length : -1;
                }

                function formatDayOfMonth(d, p) {
                  return pad(d.getDate(), p, 2);
                }

                function formatHour24(d, p) {
                  return pad(d.getHours(), p, 2);
                }

                function formatHour12(d, p) {
                  return pad(d.getHours() % 12 || 12, p, 2);
                }

                function formatDayOfYear(d, p) {
                  return pad(1 + day.count(year(d), d), p, 3);
                }

                function formatMilliseconds(d, p) {
                  return pad(d.getMilliseconds(), p, 3);
                }

                function formatMonthNumber(d, p) {
                  return pad(d.getMonth() + 1, p, 2);
                }

                function formatMinutes(d, p) {
                  return pad(d.getMinutes(), p, 2);
                }

                function formatSeconds(d, p) {
                  return pad(d.getSeconds(), p, 2);
                }

                function formatWeekNumberSunday(d, p) {
                  return pad(sunday.count(year(d), d), p, 2);
                }

                function formatWeekdayNumber(d) {
                  return d.getDay();
                }

                function formatWeekNumberMonday(d, p) {
                  return pad(monday.count(year(d), d), p, 2);
                }

                function formatYear(d, p) {
                  return pad(d.getFullYear() % 100, p, 2);
                }

                function formatFullYear(d, p) {
                  return pad(d.getFullYear() % 10000, p, 4);
                }

                function formatZone(d) {
                  var z = d.getTimezoneOffset();
                  return (z > 0 ? "-" : (z *= -1, "+"))
                      + pad(z / 60 | 0, "0", 2)
                      + pad(z % 60, "0", 2);
                }

                function formatUTCDayOfMonth(d, p) {
                  return pad(d.getUTCDate(), p, 2);
                }

                function formatUTCHour24(d, p) {
                  return pad(d.getUTCHours(), p, 2);
                }

                function formatUTCHour12(d, p) {
                  return pad(d.getUTCHours() % 12 || 12, p, 2);
                }

                function formatUTCDayOfYear(d, p) {
                  return pad(1 + utcDay.count(utcYear(d), d), p, 3);
                }

                function formatUTCMilliseconds(d, p) {
                  return pad(d.getUTCMilliseconds(), p, 3);
                }

                function formatUTCMonthNumber(d, p) {
                  return pad(d.getUTCMonth() + 1, p, 2);
                }

                function formatUTCMinutes(d, p) {
                  return pad(d.getUTCMinutes(), p, 2);
                }

                function formatUTCSeconds(d, p) {
                  return pad(d.getUTCSeconds(), p, 2);
                }

                function formatUTCWeekNumberSunday(d, p) {
                  return pad(utcSunday.count(utcYear(d), d), p, 2);
                }

                function formatUTCWeekdayNumber(d) {
                  return d.getUTCDay();
                }

                function formatUTCWeekNumberMonday(d, p) {
                  return pad(utcMonday.count(utcYear(d), d), p, 2);
                }

                function formatUTCYear(d, p) {
                  return pad(d.getUTCFullYear() % 100, p, 2);
                }

                function formatUTCFullYear(d, p) {
                  return pad(d.getUTCFullYear() % 10000, p, 4);
                }

                function formatUTCZone() {
                  return "+0000";
                }

                function formatLiteralPercent() {
                  return "%";
                }

                var locale$2;





                defaultLocale$1({
                  dateTime: "%x, %X",
                  date: "%-m/%-d/%Y",
                  time: "%-I:%M:%S %p",
                  periods: ["AM", "PM"],
                  days: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],
                  shortDays: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
                  months: ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
                  shortMonths: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
                });

                function defaultLocale$1(definition) {
                  locale$2 = formatLocale$1(definition);
                  exports.timeFormat = locale$2.format;
                  exports.timeParse = locale$2.parse;
                  exports.utcFormat = locale$2.utcFormat;
                  exports.utcParse = locale$2.utcParse;
                  return locale$2;
                }

                var isoSpecifier = "%Y-%m-%dT%H:%M:%S.%LZ";

                function formatIsoNative(date) {
                  return date.toISOString();
                }

                var formatIso = Date.prototype.toISOString
                    ? formatIsoNative
                    : exports.utcFormat(isoSpecifier);

                function parseIsoNative(string) {
                  var date = new Date(string);
                  return isNaN(date) ? null : date;
                }

                var parseIso = +new Date("2000-01-01T00:00:00.000Z")
                    ? parseIsoNative
                    : exports.utcParse(isoSpecifier);

                var array$2 = Array.prototype;

                var map$3 = array$2.map;
                var slice$3 = array$2.slice;

                var implicit = {name: "implicit"};

                function ordinal(range) {
                  var index = map$1(),
                      domain = [],
                      unknown = implicit;

                  range = range == null ? [] : slice$3.call(range);

                  function scale(d) {
                    var key = d + "", i = index.get(key);
                    if (!i) {
                      if (unknown !== implicit) return unknown;
                      index.set(key, i = domain.push(d));
                    }
                    return range[(i - 1) % range.length];
                  }

                  scale.domain = function(_) {
                    if (!arguments.length) return domain.slice();
                    domain = [], index = map$1();
                    var i = -1, n = _.length, d, key;
                    while (++i < n) if (!index.has(key = (d = _[i]) + "")) index.set(key, domain.push(d));
                    return scale;
                  };

                  scale.range = function(_) {
                    return arguments.length ? (range = slice$3.call(_), scale) : range.slice();
                  };

                  scale.unknown = function(_) {
                    return arguments.length ? (unknown = _, scale) : unknown;
                  };

                  scale.copy = function() {
                    return ordinal()
                        .domain(domain)
                        .range(range)
                        .unknown(unknown);
                  };

                  return scale;
                }

                function band() {
                  var scale = ordinal().unknown(undefined),
                      domain = scale.domain,
                      ordinalRange = scale.range,
                      range$$1 = [0, 1],
                      step,
                      bandwidth,
                      round = false,
                      paddingInner = 0,
                      paddingOuter = 0,
                      align = 0.5;

                  delete scale.unknown;

                  function rescale() {
                    var n = domain().length,
                        reverse = range$$1[1] < range$$1[0],
                        start = range$$1[reverse - 0],
                        stop = range$$1[1 - reverse];
                    step = (stop - start) / Math.max(1, n - paddingInner + paddingOuter * 2);
                    if (round) step = Math.floor(step);
                    start += (stop - start - step * (n - paddingInner)) * align;
                    bandwidth = step * (1 - paddingInner);
                    if (round) start = Math.round(start), bandwidth = Math.round(bandwidth);
                    var values = range(n).map(function(i) { return start + step * i; });
                    return ordinalRange(reverse ? values.reverse() : values);
                  }

                  scale.domain = function(_) {
                    return arguments.length ? (domain(_), rescale()) : domain();
                  };

                  scale.range = function(_) {
                    return arguments.length ? (range$$1 = [+_[0], +_[1]], rescale()) : range$$1.slice();
                  };

                  scale.rangeRound = function(_) {
                    return range$$1 = [+_[0], +_[1]], round = true, rescale();
                  };

                  scale.bandwidth = function() {
                    return bandwidth;
                  };

                  scale.step = function() {
                    return step;
                  };

                  scale.round = function(_) {
                    return arguments.length ? (round = !!_, rescale()) : round;
                  };

                  scale.padding = function(_) {
                    return arguments.length ? (paddingInner = paddingOuter = Math.max(0, Math.min(1, _)), rescale()) : paddingInner;
                  };

                  scale.paddingInner = function(_) {
                    return arguments.length ? (paddingInner = Math.max(0, Math.min(1, _)), rescale()) : paddingInner;
                  };

                  scale.paddingOuter = function(_) {
                    return arguments.length ? (paddingOuter = Math.max(0, Math.min(1, _)), rescale()) : paddingOuter;
                  };

                  scale.align = function(_) {
                    return arguments.length ? (align = Math.max(0, Math.min(1, _)), rescale()) : align;
                  };

                  scale.copy = function() {
                    return band()
                        .domain(domain())
                        .range(range$$1)
                        .round(round)
                        .paddingInner(paddingInner)
                        .paddingOuter(paddingOuter)
                        .align(align);
                  };

                  return rescale();
                }

                function pointish(scale) {
                  var copy = scale.copy;

                  scale.padding = scale.paddingOuter;
                  delete scale.paddingInner;
                  delete scale.paddingOuter;

                  scale.copy = function() {
                    return pointish(copy());
                  };

                  return scale;
                }

                function point$4() {
                  return pointish(band().paddingInner(1));
                }

                var constant$4 = function(x) {
                  return function() {
                    return x;
                  };
                };

                var number$1 = function(x) {
                  return +x;
                };

                var unit = [0, 1];

                function deinterpolateLinear(a, b) {
                  return (b -= (a = +a))
                      ? function(x) { return (x - a) / b; }
                      : constant$4(b);
                }

                function deinterpolateClamp(deinterpolate) {
                  return function(a, b) {
                    var d = deinterpolate(a = +a, b = +b);
                    return function(x) { return x <= a ? 0 : x >= b ? 1 : d(x); };
                  };
                }

                function reinterpolateClamp(reinterpolate) {
                  return function(a, b) {
                    var r = reinterpolate(a = +a, b = +b);
                    return function(t) { return t <= 0 ? a : t >= 1 ? b : r(t); };
                  };
                }

                function bimap(domain, range$$1, deinterpolate, reinterpolate) {
                  var d0 = domain[0], d1 = domain[1], r0 = range$$1[0], r1 = range$$1[1];
                  if (d1 < d0) d0 = deinterpolate(d1, d0), r0 = reinterpolate(r1, r0);
                  else d0 = deinterpolate(d0, d1), r0 = reinterpolate(r0, r1);
                  return function(x) { return r0(d0(x)); };
                }

                function polymap(domain, range$$1, deinterpolate, reinterpolate) {
                  var j = Math.min(domain.length, range$$1.length) - 1,
                      d = new Array(j),
                      r = new Array(j),
                      i = -1;

                  // Reverse descending domains.
                  if (domain[j] < domain[0]) {
                    domain = domain.slice().reverse();
                    range$$1 = range$$1.slice().reverse();
                  }

                  while (++i < j) {
                    d[i] = deinterpolate(domain[i], domain[i + 1]);
                    r[i] = reinterpolate(range$$1[i], range$$1[i + 1]);
                  }

                  return function(x) {
                    var i = bisectRight(domain, x, 1, j) - 1;
                    return r[i](d[i](x));
                  };
                }

                function copy(source, target) {
                  return target
                      .domain(source.domain())
                      .range(source.range())
                      .interpolate(source.interpolate())
                      .clamp(source.clamp());
                }

                // deinterpolate(a, b)(x) takes a domain value x in [a,b] and returns the corresponding parameter t in [0,1].
                // reinterpolate(a, b)(t) takes a parameter t in [0,1] and returns the corresponding domain value x in [a,b].
                function continuous(deinterpolate, reinterpolate) {
                  var domain = unit,
                      range$$1 = unit,
                      interpolate$$1 = interpolate,
                      clamp = false,
                      piecewise,
                      output,
                      input;

                  function rescale() {
                    piecewise = Math.min(domain.length, range$$1.length) > 2 ? polymap : bimap;
                    output = input = null;
                    return scale;
                  }

                  function scale(x) {
                    return (output || (output = piecewise(domain, range$$1, clamp ? deinterpolateClamp(deinterpolate) : deinterpolate, interpolate$$1)))(+x);
                  }

                  scale.invert = function(y) {
                    return (input || (input = piecewise(range$$1, domain, deinterpolateLinear, clamp ? reinterpolateClamp(reinterpolate) : reinterpolate)))(+y);
                  };

                  scale.domain = function(_) {
                    return arguments.length ? (domain = map$3.call(_, number$1), rescale()) : domain.slice();
                  };

                  scale.range = function(_) {
                    return arguments.length ? (range$$1 = slice$3.call(_), rescale()) : range$$1.slice();
                  };

                  scale.rangeRound = function(_) {
                    return range$$1 = slice$3.call(_), interpolate$$1 = interpolateRound, rescale();
                  };

                  scale.clamp = function(_) {
                    return arguments.length ? (clamp = !!_, rescale()) : clamp;
                  };

                  scale.interpolate = function(_) {
                    return arguments.length ? (interpolate$$1 = _, rescale()) : interpolate$$1;
                  };

                  return rescale();
                }

                var tickFormat = function(domain, count, specifier) {
                  var start = domain[0],
                      stop = domain[domain.length - 1],
                      step = tickStep(start, stop, count == null ? 10 : count),
                      precision;
                  specifier = formatSpecifier(specifier == null ? ",f" : specifier);
                  switch (specifier.type) {
                    case "s": {
                      var value = Math.max(Math.abs(start), Math.abs(stop));
                      if (specifier.precision == null && !isNaN(precision = precisionPrefix(step, value))) specifier.precision = precision;
                      return exports.formatPrefix(specifier, value);
                    }
                    case "":
                    case "e":
                    case "g":
                    case "p":
                    case "r": {
                      if (specifier.precision == null && !isNaN(precision = precisionRound(step, Math.max(Math.abs(start), Math.abs(stop))))) specifier.precision = precision - (specifier.type === "e");
                      break;
                    }
                    case "f":
                    case "%": {
                      if (specifier.precision == null && !isNaN(precision = precisionFixed(step))) specifier.precision = precision - (specifier.type === "%") * 2;
                      break;
                    }
                  }
                  return exports.format(specifier);
                };

                function linearish(scale) {
                  var domain = scale.domain;

                  scale.ticks = function(count) {
                    var d = domain();
                    return ticks(d[0], d[d.length - 1], count == null ? 10 : count);
                  };

                  scale.tickFormat = function(count, specifier) {
                    return tickFormat(domain(), count, specifier);
                  };

                  scale.nice = function(count) {
                    var d = domain(),
                        i = d.length - 1,
                        n = count == null ? 10 : count,
                        start = d[0],
                        stop = d[i],
                        step = tickStep(start, stop, n);

                    if (step) {
                      step = tickStep(Math.floor(start / step) * step, Math.ceil(stop / step) * step, n);
                      d[0] = Math.floor(start / step) * step;
                      d[i] = Math.ceil(stop / step) * step;
                      domain(d);
                    }

                    return scale;
                  };

                  return scale;
                }

                function linear$2() {
                  var scale = continuous(deinterpolateLinear, interpolateNumber);

                  scale.copy = function() {
                    return copy(scale, linear$2());
                  };

                  return linearish(scale);
                }

                function identity$4() {
                  var domain = [0, 1];

                  function scale(x) {
                    return +x;
                  }

                  scale.invert = scale;

                  scale.domain = scale.range = function(_) {
                    return arguments.length ? (domain = map$3.call(_, number$1), scale) : domain.slice();
                  };

                  scale.copy = function() {
                    return identity$4().domain(domain);
                  };

                  return linearish(scale);
                }

                var nice = function(domain, interval) {
                  domain = domain.slice();

                  var i0 = 0,
                      i1 = domain.length - 1,
                      x0 = domain[i0],
                      x1 = domain[i1],
                      t;

                  if (x1 < x0) {
                    t = i0, i0 = i1, i1 = t;
                    t = x0, x0 = x1, x1 = t;
                  }

                  domain[i0] = interval.floor(x0);
                  domain[i1] = interval.ceil(x1);
                  return domain;
                };

                function deinterpolate(a, b) {
                  return (b = Math.log(b / a))
                      ? function(x) { return Math.log(x / a) / b; }
                      : constant$4(b);
                }

                function reinterpolate(a, b) {
                  return a < 0
                      ? function(t) { return -Math.pow(-b, t) * Math.pow(-a, 1 - t); }
                      : function(t) { return Math.pow(b, t) * Math.pow(a, 1 - t); };
                }

                function pow10(x) {
                  return isFinite(x) ? +("1e" + x) : x < 0 ? 0 : x;
                }

                function powp(base) {
                  return base === 10 ? pow10
                      : base === Math.E ? Math.exp
                      : function(x) { return Math.pow(base, x); };
                }

                function logp(base) {
                  return base === Math.E ? Math.log
                      : base === 10 && Math.log10
                      || base === 2 && Math.log2
                      || (base = Math.log(base), function(x) { return Math.log(x) / base; });
                }

                function reflect(f) {
                  return function(x) {
                    return -f(-x);
                  };
                }

                function log() {
                  var scale = continuous(deinterpolate, reinterpolate).domain([1, 10]),
                      domain = scale.domain,
                      base = 10,
                      logs = logp(10),
                      pows = powp(10);

                  function rescale() {
                    logs = logp(base), pows = powp(base);
                    if (domain()[0] < 0) logs = reflect(logs), pows = reflect(pows);
                    return scale;
                  }

                  scale.base = function(_) {
                    return arguments.length ? (base = +_, rescale()) : base;
                  };

                  scale.domain = function(_) {
                    return arguments.length ? (domain(_), rescale()) : domain();
                  };

                  scale.ticks = function(count) {
                    var d = domain(),
                        u = d[0],
                        v = d[d.length - 1],
                        r;

                    if (r = v < u) i = u, u = v, v = i;

                    var i = logs(u),
                        j = logs(v),
                        p,
                        k,
                        t,
                        n = count == null ? 10 : +count,
                        z = [];

                    if (!(base % 1) && j - i < n) {
                      i = Math.round(i) - 1, j = Math.round(j) + 1;
                      if (u > 0) for (; i < j; ++i) {
                        for (k = 1, p = pows(i); k < base; ++k) {
                          t = p * k;
                          if (t < u) continue;
                          if (t > v) break;
                          z.push(t);
                        }
                      } else for (; i < j; ++i) {
                        for (k = base - 1, p = pows(i); k >= 1; --k) {
                          t = p * k;
                          if (t < u) continue;
                          if (t > v) break;
                          z.push(t);
                        }
                      }
                    } else {
                      z = ticks(i, j, Math.min(j - i, n)).map(pows);
                    }

                    return r ? z.reverse() : z;
                  };

                  scale.tickFormat = function(count, specifier) {
                    if (specifier == null) specifier = base === 10 ? ".0e" : ",";
                    if (typeof specifier !== "function") specifier = exports.format(specifier);
                    if (count === Infinity) return specifier;
                    if (count == null) count = 10;
                    var k = Math.max(1, base * count / scale.ticks().length); // TODO fast estimate?
                    return function(d) {
                      var i = d / pows(Math.round(logs(d)));
                      if (i * base < base - 0.5) i *= base;
                      return i <= k ? specifier(d) : "";
                    };
                  };

                  scale.nice = function() {
                    return domain(nice(domain(), {
                      floor: function(x) { return pows(Math.floor(logs(x))); },
                      ceil: function(x) { return pows(Math.ceil(logs(x))); }
                    }));
                  };

                  scale.copy = function() {
                    return copy(scale, log().base(base));
                  };

                  return scale;
                }

                function raise(x, exponent) {
                  return x < 0 ? -Math.pow(-x, exponent) : Math.pow(x, exponent);
                }

                function pow() {
                  var exponent = 1,
                      scale = continuous(deinterpolate, reinterpolate),
                      domain = scale.domain;

                  function deinterpolate(a, b) {
                    return (b = raise(b, exponent) - (a = raise(a, exponent)))
                        ? function(x) { return (raise(x, exponent) - a) / b; }
                        : constant$4(b);
                  }

                  function reinterpolate(a, b) {
                    b = raise(b, exponent) - (a = raise(a, exponent));
                    return function(t) { return raise(a + b * t, 1 / exponent); };
                  }

                  scale.exponent = function(_) {
                    return arguments.length ? (exponent = +_, domain(domain())) : exponent;
                  };

                  scale.copy = function() {
                    return copy(scale, pow().exponent(exponent));
                  };

                  return linearish(scale);
                }

                function sqrt() {
                  return pow().exponent(0.5);
                }

                function quantile$$1() {
                  var domain = [],
                      range$$1 = [],
                      thresholds = [];

                  function rescale() {
                    var i = 0, n = Math.max(1, range$$1.length);
                    thresholds = new Array(n - 1);
                    while (++i < n) thresholds[i - 1] = threshold(domain, i / n);
                    return scale;
                  }

                  function scale(x) {
                    if (!isNaN(x = +x)) return range$$1[bisectRight(thresholds, x)];
                  }

                  scale.invertExtent = function(y) {
                    var i = range$$1.indexOf(y);
                    return i < 0 ? [NaN, NaN] : [
                      i > 0 ? thresholds[i - 1] : domain[0],
                      i < thresholds.length ? thresholds[i] : domain[domain.length - 1]
                    ];
                  };

                  scale.domain = function(_) {
                    if (!arguments.length) return domain.slice();
                    domain = [];
                    for (var i = 0, n = _.length, d; i < n; ++i) if (d = _[i], d != null && !isNaN(d = +d)) domain.push(d);
                    domain.sort(ascending);
                    return rescale();
                  };

                  scale.range = function(_) {
                    return arguments.length ? (range$$1 = slice$3.call(_), rescale()) : range$$1.slice();
                  };

                  scale.quantiles = function() {
                    return thresholds.slice();
                  };

                  scale.copy = function() {
                    return quantile$$1()
                        .domain(domain)
                        .range(range$$1);
                  };

                  return scale;
                }

                function quantize$1() {
                  var x0 = 0,
                      x1 = 1,
                      n = 1,
                      domain = [0.5],
                      range$$1 = [0, 1];

                  function scale(x) {
                    if (x <= x) return range$$1[bisectRight(domain, x, 0, n)];
                  }

                  function rescale() {
                    var i = -1;
                    domain = new Array(n);
                    while (++i < n) domain[i] = ((i + 1) * x1 - (i - n) * x0) / (n + 1);
                    return scale;
                  }

                  scale.domain = function(_) {
                    return arguments.length ? (x0 = +_[0], x1 = +_[1], rescale()) : [x0, x1];
                  };

                  scale.range = function(_) {
                    return arguments.length ? (n = (range$$1 = slice$3.call(_)).length - 1, rescale()) : range$$1.slice();
                  };

                  scale.invertExtent = function(y) {
                    var i = range$$1.indexOf(y);
                    return i < 0 ? [NaN, NaN]
                        : i < 1 ? [x0, domain[0]]
                        : i >= n ? [domain[n - 1], x1]
                        : [domain[i - 1], domain[i]];
                  };

                  scale.copy = function() {
                    return quantize$1()
                        .domain([x0, x1])
                        .range(range$$1);
                  };

                  return linearish(scale);
                }

                function threshold$1() {
                  var domain = [0.5],
                      range$$1 = [0, 1],
                      n = 1;

                  function scale(x) {
                    if (x <= x) return range$$1[bisectRight(domain, x, 0, n)];
                  }

                  scale.domain = function(_) {
                    return arguments.length ? (domain = slice$3.call(_), n = Math.min(domain.length, range$$1.length - 1), scale) : domain.slice();
                  };

                  scale.range = function(_) {
                    return arguments.length ? (range$$1 = slice$3.call(_), n = Math.min(domain.length, range$$1.length - 1), scale) : range$$1.slice();
                  };

                  scale.invertExtent = function(y) {
                    var i = range$$1.indexOf(y);
                    return [domain[i - 1], domain[i]];
                  };

                  scale.copy = function() {
                    return threshold$1()
                        .domain(domain)
                        .range(range$$1);
                  };

                  return scale;
                }

                var durationSecond$1 = 1000;
                var durationMinute$1 = durationSecond$1 * 60;
                var durationHour$1 = durationMinute$1 * 60;
                var durationDay$1 = durationHour$1 * 24;
                var durationWeek$1 = durationDay$1 * 7;
                var durationMonth = durationDay$1 * 30;
                var durationYear = durationDay$1 * 365;

                function date$1(t) {
                  return new Date(t);
                }

                function number$2(t) {
                  return t instanceof Date ? +t : +new Date(+t);
                }

                function calendar(year$$1, month$$1, week, day$$1, hour$$1, minute$$1, second$$1, millisecond$$1, format) {
                  var scale = continuous(deinterpolateLinear, interpolateNumber),
                      invert = scale.invert,
                      domain = scale.domain;

                  var formatMillisecond = format(".%L"),
                      formatSecond = format(":%S"),
                      formatMinute = format("%I:%M"),
                      formatHour = format("%I %p"),
                      formatDay = format("%a %d"),
                      formatWeek = format("%b %d"),
                      formatMonth = format("%B"),
                      formatYear = format("%Y");

                  var tickIntervals = [
                    [second$$1,  1,      durationSecond$1],
                    [second$$1,  5,  5 * durationSecond$1],
                    [second$$1, 15, 15 * durationSecond$1],
                    [second$$1, 30, 30 * durationSecond$1],
                    [minute$$1,  1,      durationMinute$1],
                    [minute$$1,  5,  5 * durationMinute$1],
                    [minute$$1, 15, 15 * durationMinute$1],
                    [minute$$1, 30, 30 * durationMinute$1],
                    [  hour$$1,  1,      durationHour$1  ],
                    [  hour$$1,  3,  3 * durationHour$1  ],
                    [  hour$$1,  6,  6 * durationHour$1  ],
                    [  hour$$1, 12, 12 * durationHour$1  ],
                    [   day$$1,  1,      durationDay$1   ],
                    [   day$$1,  2,  2 * durationDay$1   ],
                    [  week,  1,      durationWeek$1  ],
                    [ month$$1,  1,      durationMonth ],
                    [ month$$1,  3,  3 * durationMonth ],
                    [  year$$1,  1,      durationYear  ]
                  ];

                  function tickFormat(date) {
                    return (second$$1(date) < date ? formatMillisecond
                        : minute$$1(date) < date ? formatSecond
                        : hour$$1(date) < date ? formatMinute
                        : day$$1(date) < date ? formatHour
                        : month$$1(date) < date ? (week(date) < date ? formatDay : formatWeek)
                        : year$$1(date) < date ? formatMonth
                        : formatYear)(date);
                  }

                  function tickInterval(interval, start, stop, step) {
                    if (interval == null) interval = 10;

                    // If a desired tick count is specified, pick a reasonable tick interval
                    // based on the extent of the domain and a rough estimate of tick size.
                    // Otherwise, assume interval is already a time interval and use it.
                    if (typeof interval === "number") {
                      var target = Math.abs(stop - start) / interval,
                          i = bisector(function(i) { return i[2]; }).right(tickIntervals, target);
                      if (i === tickIntervals.length) {
                        step = tickStep(start / durationYear, stop / durationYear, interval);
                        interval = year$$1;
                      } else if (i) {
                        i = tickIntervals[target / tickIntervals[i - 1][2] < tickIntervals[i][2] / target ? i - 1 : i];
                        step = i[1];
                        interval = i[0];
                      } else {
                        step = tickStep(start, stop, interval);
                        interval = millisecond$$1;
                      }
                    }

                    return step == null ? interval : interval.every(step);
                  }

                  scale.invert = function(y) {
                    return new Date(invert(y));
                  };

                  scale.domain = function(_) {
                    return arguments.length ? domain(map$3.call(_, number$2)) : domain().map(date$1);
                  };

                  scale.ticks = function(interval, step) {
                    var d = domain(),
                        t0 = d[0],
                        t1 = d[d.length - 1],
                        r = t1 < t0,
                        t;
                    if (r) t = t0, t0 = t1, t1 = t;
                    t = tickInterval(interval, t0, t1, step);
                    t = t ? t.range(t0, t1 + 1) : []; // inclusive stop
                    return r ? t.reverse() : t;
                  };

                  scale.tickFormat = function(count, specifier) {
                    return specifier == null ? tickFormat : format(specifier);
                  };

                  scale.nice = function(interval, step) {
                    var d = domain();
                    return (interval = tickInterval(interval, d[0], d[d.length - 1], step))
                        ? domain(nice(d, interval))
                        : scale;
                  };

                  scale.copy = function() {
                    return copy(scale, calendar(year$$1, month$$1, week, day$$1, hour$$1, minute$$1, second$$1, millisecond$$1, format));
                  };

                  return scale;
                }

                var time = function() {
                  return calendar(year, month, sunday, day, hour, minute, second, millisecond, exports.timeFormat).domain([new Date(2000, 0, 1), new Date(2000, 0, 2)]);
                };

                var utcTime = function() {
                  return calendar(utcYear, utcMonth, utcSunday, utcDay, utcHour, utcMinute, second, millisecond, exports.utcFormat).domain([Date.UTC(2000, 0, 1), Date.UTC(2000, 0, 2)]);
                };

                var colors = function(s) {
                  return s.match(/.{6}/g).map(function(x) {
                    return "#" + x;
                  });
                };

                var category10 = colors("1f77b4ff7f0e2ca02cd627289467bd8c564be377c27f7f7fbcbd2217becf");

                var category20b = colors("393b795254a36b6ecf9c9ede6379398ca252b5cf6bcedb9c8c6d31bd9e39e7ba52e7cb94843c39ad494ad6616be7969c7b4173a55194ce6dbdde9ed6");

                var category20c = colors("3182bd6baed69ecae1c6dbefe6550dfd8d3cfdae6bfdd0a231a35474c476a1d99bc7e9c0756bb19e9ac8bcbddcdadaeb636363969696bdbdbdd9d9d9");

                var category20 = colors("1f77b4aec7e8ff7f0effbb782ca02c98df8ad62728ff98969467bdc5b0d58c564bc49c94e377c2f7b6d27f7f7fc7c7c7bcbd22dbdb8d17becf9edae5");

                var cubehelix$3 = cubehelixLong(cubehelix(300, 0.5, 0.0), cubehelix(-240, 0.5, 1.0));

                var warm = cubehelixLong(cubehelix(-100, 0.75, 0.35), cubehelix(80, 1.50, 0.8));

                var cool = cubehelixLong(cubehelix(260, 0.75, 0.35), cubehelix(80, 1.50, 0.8));

                var rainbow = cubehelix();

                var rainbow$1 = function(t) {
                  if (t < 0 || t > 1) t -= Math.floor(t);
                  var ts = Math.abs(t - 0.5);
                  rainbow.h = 360 * t - 100;
                  rainbow.s = 1.5 - 1.5 * ts;
                  rainbow.l = 0.8 - 0.9 * ts;
                  return rainbow + "";
                };

                function ramp(range) {
                  var n = range.length;
                  return function(t) {
                    return range[Math.max(0, Math.min(n - 1, Math.floor(t * n)))];
                  };
                }

                var viridis = ramp(colors("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"));

                var magma = ramp(colors("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"));

                var inferno = ramp(colors("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"));

                var plasma = ramp(colors("0d088710078813078916078a19068c1b068d1d068e20068f2206902406912605912805922a05932c05942e05952f059631059733059735049837049938049a3a049a3c049b3e049c3f049c41049d43039e44039e46039f48039f4903a04b03a14c02a14e02a25002a25102a35302a35502a45601a45801a45901a55b01a55c01a65e01a66001a66100a76300a76400a76600a76700a86900a86a00a86c00a86e00a86f00a87100a87201a87401a87501a87701a87801a87a02a87b02a87d03a87e03a88004a88104a78305a78405a78606a68707a68808a68a09a58b0aa58d0ba58e0ca48f0da4910ea3920fa39410a29511a19613a19814a099159f9a169f9c179e9d189d9e199da01a9ca11b9ba21d9aa31e9aa51f99a62098a72197a82296aa2395ab2494ac2694ad2793ae2892b02991b12a90b22b8fb32c8eb42e8db52f8cb6308bb7318ab83289ba3388bb3488bc3587bd3786be3885bf3984c03a83c13b82c23c81c33d80c43e7fc5407ec6417dc7427cc8437bc9447aca457acb4679cc4778cc4977cd4a76ce4b75cf4c74d04d73d14e72d24f71d35171d45270d5536fd5546ed6556dd7566cd8576bd9586ada5a6ada5b69db5c68dc5d67dd5e66de5f65de6164df6263e06363e16462e26561e26660e3685fe4695ee56a5de56b5de66c5ce76e5be76f5ae87059e97158e97257ea7457eb7556eb7655ec7754ed7953ed7a52ee7b51ef7c51ef7e50f07f4ff0804ef1814df1834cf2844bf3854bf3874af48849f48948f58b47f58c46f68d45f68f44f79044f79143f79342f89441f89540f9973ff9983ef99a3efa9b3dfa9c3cfa9e3bfb9f3afba139fba238fca338fca537fca636fca835fca934fdab33fdac33fdae32fdaf31fdb130fdb22ffdb42ffdb52efeb72dfeb82cfeba2cfebb2bfebd2afebe2afec029fdc229fdc328fdc527fdc627fdc827fdca26fdcb26fccd25fcce25fcd025fcd225fbd324fbd524fbd724fad824fada24f9dc24f9dd25f8df25f8e125f7e225f7e425f6e626f6e826f5e926f5eb27f4ed27f3ee27f3f027f2f227f1f426f1f525f0f724f0f921"));

                function sequential(interpolator) {
                  var x0 = 0,
                      x1 = 1,
                      clamp = false;

                  function scale(x) {
                    var t = (x - x0) / (x1 - x0);
                    return interpolator(clamp ? Math.max(0, Math.min(1, t)) : t);
                  }

                  scale.domain = function(_) {
                    return arguments.length ? (x0 = +_[0], x1 = +_[1], scale) : [x0, x1];
                  };

                  scale.clamp = function(_) {
                    return arguments.length ? (clamp = !!_, scale) : clamp;
                  };

                  scale.interpolator = function(_) {
                    return arguments.length ? (interpolator = _, scale) : interpolator;
                  };

                  scale.copy = function() {
                    return sequential(interpolator).domain([x0, x1]).clamp(clamp);
                  };

                  return linearish(scale);
                }

                var xhtml = "http://www.w3.org/1999/xhtml";

                var namespaces = {
                  svg: "http://www.w3.org/2000/svg",
                  xhtml: xhtml,
                  xlink: "http://www.w3.org/1999/xlink",
                  xml: "http://www.w3.org/XML/1998/namespace",
                  xmlns: "http://www.w3.org/2000/xmlns/"
                };

                var namespace = function(name) {
                  var prefix = name += "", i = prefix.indexOf(":");
                  if (i >= 0 && (prefix = name.slice(0, i)) !== "xmlns") name = name.slice(i + 1);
                  return namespaces.hasOwnProperty(prefix) ? {space: namespaces[prefix], local: name} : name;
                };

                function creatorInherit(name) {
                  return function() {
                    var document = this.ownerDocument,
                        uri = this.namespaceURI;
                    return uri === xhtml && document.documentElement.namespaceURI === xhtml
                        ? document.createElement(name)
                        : document.createElementNS(uri, name);
                  };
                }

                function creatorFixed(fullname) {
                  return function() {
                    return this.ownerDocument.createElementNS(fullname.space, fullname.local);
                  };
                }

                var creator = function(name) {
                  var fullname = namespace(name);
                  return (fullname.local
                      ? creatorFixed
                      : creatorInherit)(fullname);
                };

                var nextId = 0;

                function local() {
                  return new Local;
                }

                function Local() {
                  this._ = "@" + (++nextId).toString(36);
                }

                Local.prototype = local.prototype = {
                  constructor: Local,
                  get: function(node) {
                    var id = this._;
                    while (!(id in node)) if (!(node = node.parentNode)) return;
                    return node[id];
                  },
                  set: function(node, value) {
                    return node[this._] = value;
                  },
                  remove: function(node) {
                    return this._ in node && delete node[this._];
                  },
                  toString: function() {
                    return this._;
                  }
                };

                var matcher = function(selector) {
                  return function() {
                    return this.matches(selector);
                  };
                };

                if (typeof document !== "undefined") {
                  var element = document.documentElement;
                  if (!element.matches) {
                    var vendorMatches = element.webkitMatchesSelector
                        || element.msMatchesSelector
                        || element.mozMatchesSelector
                        || element.oMatchesSelector;
                    matcher = function(selector) {
                      return function() {
                        return vendorMatches.call(this, selector);
                      };
                    };
                  }
                }

                var matcher$1 = matcher;

                var filterEvents = {};

                exports.event = null;

                if (typeof document !== "undefined") {
                  var element$1 = document.documentElement;
                  if (!("onmouseenter" in element$1)) {
                    filterEvents = {mouseenter: "mouseover", mouseleave: "mouseout"};
                  }
                }

                function filterContextListener(listener, index, group) {
                  listener = contextListener(listener, index, group);
                  return function(event) {
                    var related = event.relatedTarget;
                    if (!related || (related !== this && !(related.compareDocumentPosition(this) & 8))) {
                      listener.call(this, event);
                    }
                  };
                }

                function contextListener(listener, index, group) {
                  return function(event1) {
                    var event0 = exports.event; // Events can be reentrant (e.g., focus).
                    exports.event = event1;
                    try {
                      listener.call(this, this.__data__, index, group);
                    } finally {
                      exports.event = event0;
                    }
                  };
                }

                function parseTypenames$1(typenames) {
                  return typenames.trim().split(/^|\s+/).map(function(t) {
                    var name = "", i = t.indexOf(".");
                    if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);
                    return {type: t, name: name};
                  });
                }

                function onRemove(typename) {
                  return function() {
                    var on = this.__on;
                    if (!on) return;
                    for (var j = 0, i = -1, m = on.length, o; j < m; ++j) {
                      if (o = on[j], (!typename.type || o.type === typename.type) && o.name === typename.name) {
                        this.removeEventListener(o.type, o.listener, o.capture);
                      } else {
                        on[++i] = o;
                      }
                    }
                    if (++i) on.length = i;
                    else delete this.__on;
                  };
                }

                function onAdd(typename, value, capture) {
                  var wrap = filterEvents.hasOwnProperty(typename.type) ? filterContextListener : contextListener;
                  return function(d, i, group) {
                    var on = this.__on, o, listener = wrap(value, i, group);
                    if (on) for (var j = 0, m = on.length; j < m; ++j) {
                      if ((o = on[j]).type === typename.type && o.name === typename.name) {
                        this.removeEventListener(o.type, o.listener, o.capture);
                        this.addEventListener(o.type, o.listener = listener, o.capture = capture);
                        o.value = value;
                        return;
                      }
                    }
                    this.addEventListener(typename.type, listener, capture);
                    o = {type: typename.type, name: typename.name, value: value, listener: listener, capture: capture};
                    if (!on) this.__on = [o];
                    else on.push(o);
                  };
                }

                var selection_on = function(typename, value, capture) {
                  var typenames = parseTypenames$1(typename + ""), i, n = typenames.length, t;

                  if (arguments.length < 2) {
                    var on = this.node().__on;
                    if (on) for (var j = 0, m = on.length, o; j < m; ++j) {
                      for (i = 0, o = on[j]; i < n; ++i) {
                        if ((t = typenames[i]).type === o.type && t.name === o.name) {
                          return o.value;
                        }
                      }
                    }
                    return;
                  }

                  on = value ? onAdd : onRemove;
                  if (capture == null) capture = false;
                  for (i = 0; i < n; ++i) this.each(on(typenames[i], value, capture));
                  return this;
                };

                function customEvent(event1, listener, that, args) {
                  var event0 = exports.event;
                  event1.sourceEvent = exports.event;
                  exports.event = event1;
                  try {
                    return listener.apply(that, args);
                  } finally {
                    exports.event = event0;
                  }
                }

                var sourceEvent = function() {
                  var current = exports.event, source;
                  while (source = current.sourceEvent) current = source;
                  return current;
                };

                var point$5 = function(node, event) {
                  var svg = node.ownerSVGElement || node;

                  if (svg.createSVGPoint) {
                    var point = svg.createSVGPoint();
                    point.x = event.clientX, point.y = event.clientY;
                    point = point.matrixTransform(node.getScreenCTM().inverse());
                    return [point.x, point.y];
                  }

                  var rect = node.getBoundingClientRect();
                  return [event.clientX - rect.left - node.clientLeft, event.clientY - rect.top - node.clientTop];
                };

                var mouse = function(node) {
                  var event = sourceEvent();
                  if (event.changedTouches) event = event.changedTouches[0];
                  return point$5(node, event);
                };

                function none$2() {}

                var selector = function(selector) {
                  return selector == null ? none$2 : function() {
                    return this.querySelector(selector);
                  };
                };

                var selection_select = function(select) {
                  if (typeof select !== "function") select = selector(select);

                  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
                    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
                      if ((node = group[i]) && (subnode = select.call(node, node.__data__, i, group))) {
                        if ("__data__" in node) subnode.__data__ = node.__data__;
                        subgroup[i] = subnode;
                      }
                    }
                  }

                  return new Selection(subgroups, this._parents);
                };

                function empty() {
                  return [];
                }

                var selectorAll = function(selector) {
                  return selector == null ? empty : function() {
                    return this.querySelectorAll(selector);
                  };
                };

                var selection_selectAll = function(select) {
                  if (typeof select !== "function") select = selectorAll(select);

                  for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
                    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
                      if (node = group[i]) {
                        subgroups.push(select.call(node, node.__data__, i, group));
                        parents.push(node);
                      }
                    }
                  }

                  return new Selection(subgroups, parents);
                };

                var selection_filter = function(match) {
                  if (typeof match !== "function") match = matcher$1(match);

                  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
                    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = [], node, i = 0; i < n; ++i) {
                      if ((node = group[i]) && match.call(node, node.__data__, i, group)) {
                        subgroup.push(node);
                      }
                    }
                  }

                  return new Selection(subgroups, this._parents);
                };

                var sparse = function(update) {
                  return new Array(update.length);
                };

                var selection_enter = function() {
                  return new Selection(this._enter || this._groups.map(sparse), this._parents);
                };

                function EnterNode(parent, datum) {
                  this.ownerDocument = parent.ownerDocument;
                  this.namespaceURI = parent.namespaceURI;
                  this._next = null;
                  this._parent = parent;
                  this.__data__ = datum;
                }

                EnterNode.prototype = {
                  constructor: EnterNode,
                  appendChild: function(child) { return this._parent.insertBefore(child, this._next); },
                  insertBefore: function(child, next) { return this._parent.insertBefore(child, next); },
                  querySelector: function(selector) { return this._parent.querySelector(selector); },
                  querySelectorAll: function(selector) { return this._parent.querySelectorAll(selector); }
                };

                var constant$5 = function(x) {
                  return function() {
                    return x;
                  };
                };

                var keyPrefix = "$"; // Protect against keys like “__proto__”.

                function bindIndex(parent, group, enter, update, exit, data) {
                  var i = 0,
                      node,
                      groupLength = group.length,
                      dataLength = data.length;

                  // Put any non-null nodes that fit into update.
                  // Put any null nodes into enter.
                  // Put any remaining data into enter.
                  for (; i < dataLength; ++i) {
                    if (node = group[i]) {
                      node.__data__ = data[i];
                      update[i] = node;
                    } else {
                      enter[i] = new EnterNode(parent, data[i]);
                    }
                  }

                  // Put any non-null nodes that don’t fit into exit.
                  for (; i < groupLength; ++i) {
                    if (node = group[i]) {
                      exit[i] = node;
                    }
                  }
                }

                function bindKey(parent, group, enter, update, exit, data, key) {
                  var i,
                      node,
                      nodeByKeyValue = {},
                      groupLength = group.length,
                      dataLength = data.length,
                      keyValues = new Array(groupLength),
                      keyValue;

                  // Compute the key for each node.
                  // If multiple nodes have the same key, the duplicates are added to exit.
                  for (i = 0; i < groupLength; ++i) {
                    if (node = group[i]) {
                      keyValues[i] = keyValue = keyPrefix + key.call(node, node.__data__, i, group);
                      if (keyValue in nodeByKeyValue) {
                        exit[i] = node;
                      } else {
                        nodeByKeyValue[keyValue] = node;
                      }
                    }
                  }

                  // Compute the key for each datum.
                  // If there a node associated with this key, join and add it to update.
                  // If there is not (or the key is a duplicate), add it to enter.
                  for (i = 0; i < dataLength; ++i) {
                    keyValue = keyPrefix + key.call(parent, data[i], i, data);
                    if (node = nodeByKeyValue[keyValue]) {
                      update[i] = node;
                      node.__data__ = data[i];
                      nodeByKeyValue[keyValue] = null;
                    } else {
                      enter[i] = new EnterNode(parent, data[i]);
                    }
                  }

                  // Add any remaining nodes that were not bound to data to exit.
                  for (i = 0; i < groupLength; ++i) {
                    if ((node = group[i]) && (nodeByKeyValue[keyValues[i]] === node)) {
                      exit[i] = node;
                    }
                  }
                }

                var selection_data = function(value, key) {
                  if (!value) {
                    data = new Array(this.size()), j = -1;
                    this.each(function(d) { data[++j] = d; });
                    return data;
                  }

                  var bind = key ? bindKey : bindIndex,
                      parents = this._parents,
                      groups = this._groups;

                  if (typeof value !== "function") value = constant$5(value);

                  for (var m = groups.length, update = new Array(m), enter = new Array(m), exit = new Array(m), j = 0; j < m; ++j) {
                    var parent = parents[j],
                        group = groups[j],
                        groupLength = group.length,
                        data = value.call(parent, parent && parent.__data__, j, parents),
                        dataLength = data.length,
                        enterGroup = enter[j] = new Array(dataLength),
                        updateGroup = update[j] = new Array(dataLength),
                        exitGroup = exit[j] = new Array(groupLength);

                    bind(parent, group, enterGroup, updateGroup, exitGroup, data, key);

                    // Now connect the enter nodes to their following update node, such that
                    // appendChild can insert the materialized enter node before this node,
                    // rather than at the end of the parent node.
                    for (var i0 = 0, i1 = 0, previous, next; i0 < dataLength; ++i0) {
                      if (previous = enterGroup[i0]) {
                        if (i0 >= i1) i1 = i0 + 1;
                        while (!(next = updateGroup[i1]) && ++i1 < dataLength);
                        previous._next = next || null;
                      }
                    }
                  }

                  update = new Selection(update, parents);
                  update._enter = enter;
                  update._exit = exit;
                  return update;
                };

                var selection_exit = function() {
                  return new Selection(this._exit || this._groups.map(sparse), this._parents);
                };

                var selection_merge = function(selection) {

                  for (var groups0 = this._groups, groups1 = selection._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
                    for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
                      if (node = group0[i] || group1[i]) {
                        merge[i] = node;
                      }
                    }
                  }

                  for (; j < m0; ++j) {
                    merges[j] = groups0[j];
                  }

                  return new Selection(merges, this._parents);
                };

                var selection_order = function() {

                  for (var groups = this._groups, j = -1, m = groups.length; ++j < m;) {
                    for (var group = groups[j], i = group.length - 1, next = group[i], node; --i >= 0;) {
                      if (node = group[i]) {
                        if (next && next !== node.nextSibling) next.parentNode.insertBefore(node, next);
                        next = node;
                      }
                    }
                  }

                  return this;
                };

                var selection_sort = function(compare) {
                  if (!compare) compare = ascending$2;

                  function compareNode(a, b) {
                    return a && b ? compare(a.__data__, b.__data__) : !a - !b;
                  }

                  for (var groups = this._groups, m = groups.length, sortgroups = new Array(m), j = 0; j < m; ++j) {
                    for (var group = groups[j], n = group.length, sortgroup = sortgroups[j] = new Array(n), node, i = 0; i < n; ++i) {
                      if (node = group[i]) {
                        sortgroup[i] = node;
                      }
                    }
                    sortgroup.sort(compareNode);
                  }

                  return new Selection(sortgroups, this._parents).order();
                };

                function ascending$2(a, b) {
                  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
                }

                var selection_call = function() {
                  var callback = arguments[0];
                  arguments[0] = this;
                  callback.apply(null, arguments);
                  return this;
                };

                var selection_nodes = function() {
                  var nodes = new Array(this.size()), i = -1;
                  this.each(function() { nodes[++i] = this; });
                  return nodes;
                };

                var selection_node = function() {

                  for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {
                    for (var group = groups[j], i = 0, n = group.length; i < n; ++i) {
                      var node = group[i];
                      if (node) return node;
                    }
                  }

                  return null;
                };

                var selection_size = function() {
                  var size = 0;
                  this.each(function() { ++size; });
                  return size;
                };

                var selection_empty = function() {
                  return !this.node();
                };

                var selection_each = function(callback) {

                  for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {
                    for (var group = groups[j], i = 0, n = group.length, node; i < n; ++i) {
                      if (node = group[i]) callback.call(node, node.__data__, i, group);
                    }
                  }

                  return this;
                };

                function attrRemove(name) {
                  return function() {
                    this.removeAttribute(name);
                  };
                }

                function attrRemoveNS(fullname) {
                  return function() {
                    this.removeAttributeNS(fullname.space, fullname.local);
                  };
                }

                function attrConstant(name, value) {
                  return function() {
                    this.setAttribute(name, value);
                  };
                }

                function attrConstantNS(fullname, value) {
                  return function() {
                    this.setAttributeNS(fullname.space, fullname.local, value);
                  };
                }

                function attrFunction(name, value) {
                  return function() {
                    var v = value.apply(this, arguments);
                    if (v == null) this.removeAttribute(name);
                    else this.setAttribute(name, v);
                  };
                }

                function attrFunctionNS(fullname, value) {
                  return function() {
                    var v = value.apply(this, arguments);
                    if (v == null) this.removeAttributeNS(fullname.space, fullname.local);
                    else this.setAttributeNS(fullname.space, fullname.local, v);
                  };
                }

                var selection_attr = function(name, value) {
                  var fullname = namespace(name);

                  if (arguments.length < 2) {
                    var node = this.node();
                    return fullname.local
                        ? node.getAttributeNS(fullname.space, fullname.local)
                        : node.getAttribute(fullname);
                  }

                  return this.each((value == null
                      ? (fullname.local ? attrRemoveNS : attrRemove) : (typeof value === "function"
                      ? (fullname.local ? attrFunctionNS : attrFunction)
                      : (fullname.local ? attrConstantNS : attrConstant)))(fullname, value));
                };

                var window = function(node) {
                  return (node.ownerDocument && node.ownerDocument.defaultView) // node is a Node
                      || (node.document && node) // node is a Window
                      || node.defaultView; // node is a Document
                };

                function styleRemove(name) {
                  return function() {
                    this.style.removeProperty(name);
                  };
                }

                function styleConstant(name, value, priority) {
                  return function() {
                    this.style.setProperty(name, value, priority);
                  };
                }

                function styleFunction(name, value, priority) {
                  return function() {
                    var v = value.apply(this, arguments);
                    if (v == null) this.style.removeProperty(name);
                    else this.style.setProperty(name, v, priority);
                  };
                }

                var selection_style = function(name, value, priority) {
                  var node;
                  return arguments.length > 1
                      ? this.each((value == null
                            ? styleRemove : typeof value === "function"
                            ? styleFunction
                            : styleConstant)(name, value, priority == null ? "" : priority))
                      : window(node = this.node())
                          .getComputedStyle(node, null)
                          .getPropertyValue(name);
                };

                function propertyRemove(name) {
                  return function() {
                    delete this[name];
                  };
                }

                function propertyConstant(name, value) {
                  return function() {
                    this[name] = value;
                  };
                }

                function propertyFunction(name, value) {
                  return function() {
                    var v = value.apply(this, arguments);
                    if (v == null) delete this[name];
                    else this[name] = v;
                  };
                }

                var selection_property = function(name, value) {
                  return arguments.length > 1
                      ? this.each((value == null
                          ? propertyRemove : typeof value === "function"
                          ? propertyFunction
                          : propertyConstant)(name, value))
                      : this.node()[name];
                };

                function classArray(string) {
                  return string.trim().split(/^|\s+/);
                }

                function classList(node) {
                  return node.classList || new ClassList(node);
                }

                function ClassList(node) {
                  this._node = node;
                  this._names = classArray(node.getAttribute("class") || "");
                }

                ClassList.prototype = {
                  add: function(name) {
                    var i = this._names.indexOf(name);
                    if (i < 0) {
                      this._names.push(name);
                      this._node.setAttribute("class", this._names.join(" "));
                    }
                  },
                  remove: function(name) {
                    var i = this._names.indexOf(name);
                    if (i >= 0) {
                      this._names.splice(i, 1);
                      this._node.setAttribute("class", this._names.join(" "));
                    }
                  },
                  contains: function(name) {
                    return this._names.indexOf(name) >= 0;
                  }
                };

                function classedAdd(node, names) {
                  var list = classList(node), i = -1, n = names.length;
                  while (++i < n) list.add(names[i]);
                }

                function classedRemove(node, names) {
                  var list = classList(node), i = -1, n = names.length;
                  while (++i < n) list.remove(names[i]);
                }

                function classedTrue(names) {
                  return function() {
                    classedAdd(this, names);
                  };
                }

                function classedFalse(names) {
                  return function() {
                    classedRemove(this, names);
                  };
                }

                function classedFunction(names, value) {
                  return function() {
                    (value.apply(this, arguments) ? classedAdd : classedRemove)(this, names);
                  };
                }

                var selection_classed = function(name, value) {
                  var names = classArray(name + "");

                  if (arguments.length < 2) {
                    var list = classList(this.node()), i = -1, n = names.length;
                    while (++i < n) if (!list.contains(names[i])) return false;
                    return true;
                  }

                  return this.each((typeof value === "function"
                      ? classedFunction : value
                      ? classedTrue
                      : classedFalse)(names, value));
                };

                function textRemove() {
                  this.textContent = "";
                }

                function textConstant(value) {
                  return function() {
                    this.textContent = value;
                  };
                }

                function textFunction(value) {
                  return function() {
                    var v = value.apply(this, arguments);
                    this.textContent = v == null ? "" : v;
                  };
                }

                var selection_text = function(value) {
                  return arguments.length
                      ? this.each(value == null
                          ? textRemove : (typeof value === "function"
                          ? textFunction
                          : textConstant)(value))
                      : this.node().textContent;
                };

                function htmlRemove() {
                  this.innerHTML = "";
                }

                function htmlConstant(value) {
                  return function() {
                    this.innerHTML = value;
                  };
                }

                function htmlFunction(value) {
                  return function() {
                    var v = value.apply(this, arguments);
                    this.innerHTML = v == null ? "" : v;
                  };
                }

                var selection_html = function(value) {
                  return arguments.length
                      ? this.each(value == null
                          ? htmlRemove : (typeof value === "function"
                          ? htmlFunction
                          : htmlConstant)(value))
                      : this.node().innerHTML;
                };

                function raise$1() {
                  if (this.nextSibling) this.parentNode.appendChild(this);
                }

                var selection_raise = function() {
                  return this.each(raise$1);
                };

                function lower() {
                  if (this.previousSibling) this.parentNode.insertBefore(this, this.parentNode.firstChild);
                }

                var selection_lower = function() {
                  return this.each(lower);
                };

                var selection_append = function(name) {
                  var create = typeof name === "function" ? name : creator(name);
                  return this.select(function() {
                    return this.appendChild(create.apply(this, arguments));
                  });
                };

                function constantNull() {
                  return null;
                }

                var selection_insert = function(name, before) {
                  var create = typeof name === "function" ? name : creator(name),
                      select = before == null ? constantNull : typeof before === "function" ? before : selector(before);
                  return this.select(function() {
                    return this.insertBefore(create.apply(this, arguments), select.apply(this, arguments) || null);
                  });
                };

                function remove() {
                  var parent = this.parentNode;
                  if (parent) parent.removeChild(this);
                }

                var selection_remove = function() {
                  return this.each(remove);
                };

                var selection_datum = function(value) {
                  return arguments.length
                      ? this.property("__data__", value)
                      : this.node().__data__;
                };

                function dispatchEvent(node, type, params) {
                  var window$$1 = window(node),
                      event = window$$1.CustomEvent;

                  if (event) {
                    event = new event(type, params);
                  } else {
                    event = window$$1.document.createEvent("Event");
                    if (params) event.initEvent(type, params.bubbles, params.cancelable), event.detail = params.detail;
                    else event.initEvent(type, false, false);
                  }

                  node.dispatchEvent(event);
                }

                function dispatchConstant(type, params) {
                  return function() {
                    return dispatchEvent(this, type, params);
                  };
                }

                function dispatchFunction(type, params) {
                  return function() {
                    return dispatchEvent(this, type, params.apply(this, arguments));
                  };
                }

                var selection_dispatch = function(type, params) {
                  return this.each((typeof params === "function"
                      ? dispatchFunction
                      : dispatchConstant)(type, params));
                };

                var root = [null];

                function Selection(groups, parents) {
                  this._groups = groups;
                  this._parents = parents;
                }

                function selection() {
                  return new Selection([[document.documentElement]], root);
                }

                Selection.prototype = selection.prototype = {
                  constructor: Selection,
                  select: selection_select,
                  selectAll: selection_selectAll,
                  filter: selection_filter,
                  data: selection_data,
                  enter: selection_enter,
                  exit: selection_exit,
                  merge: selection_merge,
                  order: selection_order,
                  sort: selection_sort,
                  call: selection_call,
                  nodes: selection_nodes,
                  node: selection_node,
                  size: selection_size,
                  empty: selection_empty,
                  each: selection_each,
                  attr: selection_attr,
                  style: selection_style,
                  property: selection_property,
                  classed: selection_classed,
                  text: selection_text,
                  html: selection_html,
                  raise: selection_raise,
                  lower: selection_lower,
                  append: selection_append,
                  insert: selection_insert,
                  remove: selection_remove,
                  datum: selection_datum,
                  on: selection_on,
                  dispatch: selection_dispatch
                };

                var select = function(selector) {
                  return typeof selector === "string"
                      ? new Selection([[document.querySelector(selector)]], [document.documentElement])
                      : new Selection([[selector]], root);
                };

                var selectAll = function(selector) {
                  return typeof selector === "string"
                      ? new Selection([document.querySelectorAll(selector)], [document.documentElement])
                      : new Selection([selector == null ? [] : selector], root);
                };

                var touch = function(node, touches, identifier) {
                  if (arguments.length < 3) identifier = touches, touches = sourceEvent().changedTouches;

                  for (var i = 0, n = touches ? touches.length : 0, touch; i < n; ++i) {
                    if ((touch = touches[i]).identifier === identifier) {
                      return point$5(node, touch);
                    }
                  }

                  return null;
                };

                var touches = function(node, touches) {
                  if (touches == null) touches = sourceEvent().touches;

                  for (var i = 0, n = touches ? touches.length : 0, points = new Array(n); i < n; ++i) {
                    points[i] = point$5(node, touches[i]);
                  }

                  return points;
                };

                var emptyOn = dispatch("start", "end", "interrupt");
                var emptyTween = [];

                var CREATED = 0;
                var SCHEDULED = 1;
                var STARTING = 2;
                var STARTED = 3;
                var RUNNING = 4;
                var ENDING = 5;
                var ENDED = 6;

                var schedule = function(node, name, id, index, group, timing) {
                  var schedules = node.__transition;
                  if (!schedules) node.__transition = {};
                  else if (id in schedules) return;
                  create(node, id, {
                    name: name,
                    index: index, // For context during callback.
                    group: group, // For context during callback.
                    on: emptyOn,
                    tween: emptyTween,
                    time: timing.time,
                    delay: timing.delay,
                    duration: timing.duration,
                    ease: timing.ease,
                    timer: null,
                    state: CREATED
                  });
                };

                function init(node, id) {
                  var schedule = node.__transition;
                  if (!schedule || !(schedule = schedule[id]) || schedule.state > CREATED) throw new Error("too late");
                  return schedule;
                }

                function set$3(node, id) {
                  var schedule = node.__transition;
                  if (!schedule || !(schedule = schedule[id]) || schedule.state > STARTING) throw new Error("too late");
                  return schedule;
                }

                function get$1(node, id) {
                  var schedule = node.__transition;
                  if (!schedule || !(schedule = schedule[id])) throw new Error("too late");
                  return schedule;
                }

                function create(node, id, self) {
                  var schedules = node.__transition,
                      tween;

                  // Initialize the self timer when the transition is created.
                  // Note the actual delay is not known until the first callback!
                  schedules[id] = self;
                  self.timer = timer(schedule, 0, self.time);

                  function schedule(elapsed) {
                    self.state = SCHEDULED;
                    self.timer.restart(start, self.delay, self.time);

                    // If the elapsed delay is less than our first sleep, start immediately.
                    if (self.delay <= elapsed) start(elapsed - self.delay);
                  }

                  function start(elapsed) {
                    var i, j, n, o;

                    // If the state is not SCHEDULED, then we previously errored on start.
                    if (self.state !== SCHEDULED) return stop();

                    for (i in schedules) {
                      o = schedules[i];
                      if (o.name !== self.name) continue;

                      // While this element already has a starting transition during this frame,
                      // defer starting an interrupting transition until that transition has a
                      // chance to tick (and possibly end); see d3/d3-transition#54!
                      if (o.state === STARTED) return timeout$1(start);

                      // Interrupt the active transition, if any.
                      // Dispatch the interrupt event.
                      if (o.state === RUNNING) {
                        o.state = ENDED;
                        o.timer.stop();
                        o.on.call("interrupt", node, node.__data__, o.index, o.group);
                        delete schedules[i];
                      }

                      // Cancel any pre-empted transitions. No interrupt event is dispatched
                      // because the cancelled transitions never started. Note that this also
                      // removes this transition from the pending list!
                      else if (+i < id) {
                        o.state = ENDED;
                        o.timer.stop();
                        delete schedules[i];
                      }
                    }

                    // Defer the first tick to end of the current frame; see d3/d3#1576.
                    // Note the transition may be canceled after start and before the first tick!
                    // Note this must be scheduled before the start event; see d3/d3-transition#16!
                    // Assuming this is successful, subsequent callbacks go straight to tick.
                    timeout$1(function() {
                      if (self.state === STARTED) {
                        self.state = RUNNING;
                        self.timer.restart(tick, self.delay, self.time);
                        tick(elapsed);
                      }
                    });

                    // Dispatch the start event.
                    // Note this must be done before the tween are initialized.
                    self.state = STARTING;
                    self.on.call("start", node, node.__data__, self.index, self.group);
                    if (self.state !== STARTING) return; // interrupted
                    self.state = STARTED;

                    // Initialize the tween, deleting null tween.
                    tween = new Array(n = self.tween.length);
                    for (i = 0, j = -1; i < n; ++i) {
                      if (o = self.tween[i].value.call(node, node.__data__, self.index, self.group)) {
                        tween[++j] = o;
                      }
                    }
                    tween.length = j + 1;
                  }

                  function tick(elapsed) {
                    var t = elapsed < self.duration ? self.ease.call(null, elapsed / self.duration) : (self.timer.restart(stop), self.state = ENDING, 1),
                        i = -1,
                        n = tween.length;

                    while (++i < n) {
                      tween[i].call(null, t);
                    }

                    // Dispatch the end event.
                    if (self.state === ENDING) {
                      self.on.call("end", node, node.__data__, self.index, self.group);
                      stop();
                    }
                  }

                  function stop() {
                    self.state = ENDED;
                    self.timer.stop();
                    delete schedules[id];
                    for (var i in schedules) return; // eslint-disable-line no-unused-vars
                    delete node.__transition;
                  }
                }

                var interrupt = function(node, name) {
                  var schedules = node.__transition,
                      schedule,
                      active,
                      empty = true,
                      i;

                  if (!schedules) return;

                  name = name == null ? null : name + "";

                  for (i in schedules) {
                    if ((schedule = schedules[i]).name !== name) { empty = false; continue; }
                    active = schedule.state > STARTING && schedule.state < ENDING;
                    schedule.state = ENDED;
                    schedule.timer.stop();
                    if (active) schedule.on.call("interrupt", node, node.__data__, schedule.index, schedule.group);
                    delete schedules[i];
                  }

                  if (empty) delete node.__transition;
                };

                var selection_interrupt = function(name) {
                  return this.each(function() {
                    interrupt(this, name);
                  });
                };

                function tweenRemove(id, name) {
                  var tween0, tween1;
                  return function() {
                    var schedule = set$3(this, id),
                        tween = schedule.tween;

                    // If this node shared tween with the previous node,
                    // just assign the updated shared tween and we’re done!
                    // Otherwise, copy-on-write.
                    if (tween !== tween0) {
                      tween1 = tween0 = tween;
                      for (var i = 0, n = tween1.length; i < n; ++i) {
                        if (tween1[i].name === name) {
                          tween1 = tween1.slice();
                          tween1.splice(i, 1);
                          break;
                        }
                      }
                    }

                    schedule.tween = tween1;
                  };
                }

                function tweenFunction(id, name, value) {
                  var tween0, tween1;
                  if (typeof value !== "function") throw new Error;
                  return function() {
                    var schedule = set$3(this, id),
                        tween = schedule.tween;

                    // If this node shared tween with the previous node,
                    // just assign the updated shared tween and we’re done!
                    // Otherwise, copy-on-write.
                    if (tween !== tween0) {
                      tween1 = (tween0 = tween).slice();
                      for (var t = {name: name, value: value}, i = 0, n = tween1.length; i < n; ++i) {
                        if (tween1[i].name === name) {
                          tween1[i] = t;
                          break;
                        }
                      }
                      if (i === n) tween1.push(t);
                    }

                    schedule.tween = tween1;
                  };
                }

                var transition_tween = function(name, value) {
                  var id = this._id;

                  name += "";

                  if (arguments.length < 2) {
                    var tween = get$1(this.node(), id).tween;
                    for (var i = 0, n = tween.length, t; i < n; ++i) {
                      if ((t = tween[i]).name === name) {
                        return t.value;
                      }
                    }
                    return null;
                  }

                  return this.each((value == null ? tweenRemove : tweenFunction)(id, name, value));
                };

                function tweenValue(transition, name, value) {
                  var id = transition._id;

                  transition.each(function() {
                    var schedule = set$3(this, id);
                    (schedule.value || (schedule.value = {}))[name] = value.apply(this, arguments);
                  });

                  return function(node) {
                    return get$1(node, id).value[name];
                  };
                }

                var interpolate$1 = function(a, b) {
                  var c;
                  return (typeof b === "number" ? interpolateNumber
                      : b instanceof color ? interpolateRgb
                      : (c = color(b)) ? (b = c, interpolateRgb)
                      : interpolateString)(a, b);
                };

                function attrRemove$1(name) {
                  return function() {
                    this.removeAttribute(name);
                  };
                }

                function attrRemoveNS$1(fullname) {
                  return function() {
                    this.removeAttributeNS(fullname.space, fullname.local);
                  };
                }

                function attrConstant$1(name, interpolate$$1, value1) {
                  var value00,
                      interpolate0;
                  return function() {
                    var value0 = this.getAttribute(name);
                    return value0 === value1 ? null
                        : value0 === value00 ? interpolate0
                        : interpolate0 = interpolate$$1(value00 = value0, value1);
                  };
                }

                function attrConstantNS$1(fullname, interpolate$$1, value1) {
                  var value00,
                      interpolate0;
                  return function() {
                    var value0 = this.getAttributeNS(fullname.space, fullname.local);
                    return value0 === value1 ? null
                        : value0 === value00 ? interpolate0
                        : interpolate0 = interpolate$$1(value00 = value0, value1);
                  };
                }

                function attrFunction$1(name, interpolate$$1, value) {
                  var value00,
                      value10,
                      interpolate0;
                  return function() {
                    var value0, value1 = value(this);
                    if (value1 == null) return void this.removeAttribute(name);
                    value0 = this.getAttribute(name);
                    return value0 === value1 ? null
                        : value0 === value00 && value1 === value10 ? interpolate0
                        : interpolate0 = interpolate$$1(value00 = value0, value10 = value1);
                  };
                }

                function attrFunctionNS$1(fullname, interpolate$$1, value) {
                  var value00,
                      value10,
                      interpolate0;
                  return function() {
                    var value0, value1 = value(this);
                    if (value1 == null) return void this.removeAttributeNS(fullname.space, fullname.local);
                    value0 = this.getAttributeNS(fullname.space, fullname.local);
                    return value0 === value1 ? null
                        : value0 === value00 && value1 === value10 ? interpolate0
                        : interpolate0 = interpolate$$1(value00 = value0, value10 = value1);
                  };
                }

                var transition_attr = function(name, value) {
                  var fullname = namespace(name), i = fullname === "transform" ? interpolateTransformSvg : interpolate$1;
                  return this.attrTween(name, typeof value === "function"
                      ? (fullname.local ? attrFunctionNS$1 : attrFunction$1)(fullname, i, tweenValue(this, "attr." + name, value))
                      : value == null ? (fullname.local ? attrRemoveNS$1 : attrRemove$1)(fullname)
                      : (fullname.local ? attrConstantNS$1 : attrConstant$1)(fullname, i, value));
                };

                function attrTweenNS(fullname, value) {
                  function tween() {
                    var node = this, i = value.apply(node, arguments);
                    return i && function(t) {
                      node.setAttributeNS(fullname.space, fullname.local, i(t));
                    };
                  }
                  tween._value = value;
                  return tween;
                }

                function attrTween(name, value) {
                  function tween() {
                    var node = this, i = value.apply(node, arguments);
                    return i && function(t) {
                      node.setAttribute(name, i(t));
                    };
                  }
                  tween._value = value;
                  return tween;
                }

                var transition_attrTween = function(name, value) {
                  var key = "attr." + name;
                  if (arguments.length < 2) return (key = this.tween(key)) && key._value;
                  if (value == null) return this.tween(key, null);
                  if (typeof value !== "function") throw new Error;
                  var fullname = namespace(name);
                  return this.tween(key, (fullname.local ? attrTweenNS : attrTween)(fullname, value));
                };

                function delayFunction(id, value) {
                  return function() {
                    init(this, id).delay = +value.apply(this, arguments);
                  };
                }

                function delayConstant(id, value) {
                  return value = +value, function() {
                    init(this, id).delay = value;
                  };
                }

                var transition_delay = function(value) {
                  var id = this._id;

                  return arguments.length
                      ? this.each((typeof value === "function"
                          ? delayFunction
                          : delayConstant)(id, value))
                      : get$1(this.node(), id).delay;
                };

                function durationFunction(id, value) {
                  return function() {
                    set$3(this, id).duration = +value.apply(this, arguments);
                  };
                }

                function durationConstant(id, value) {
                  return value = +value, function() {
                    set$3(this, id).duration = value;
                  };
                }

                var transition_duration = function(value) {
                  var id = this._id;

                  return arguments.length
                      ? this.each((typeof value === "function"
                          ? durationFunction
                          : durationConstant)(id, value))
                      : get$1(this.node(), id).duration;
                };

                function easeConstant(id, value) {
                  if (typeof value !== "function") throw new Error;
                  return function() {
                    set$3(this, id).ease = value;
                  };
                }

                var transition_ease = function(value) {
                  var id = this._id;

                  return arguments.length
                      ? this.each(easeConstant(id, value))
                      : get$1(this.node(), id).ease;
                };

                var transition_filter = function(match) {
                  if (typeof match !== "function") match = matcher$1(match);

                  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
                    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = [], node, i = 0; i < n; ++i) {
                      if ((node = group[i]) && match.call(node, node.__data__, i, group)) {
                        subgroup.push(node);
                      }
                    }
                  }

                  return new Transition(subgroups, this._parents, this._name, this._id);
                };

                var transition_merge = function(transition) {
                  if (transition._id !== this._id) throw new Error;

                  for (var groups0 = this._groups, groups1 = transition._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
                    for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
                      if (node = group0[i] || group1[i]) {
                        merge[i] = node;
                      }
                    }
                  }

                  for (; j < m0; ++j) {
                    merges[j] = groups0[j];
                  }

                  return new Transition(merges, this._parents, this._name, this._id);
                };

                function start$1(name) {
                  return (name + "").trim().split(/^|\s+/).every(function(t) {
                    var i = t.indexOf(".");
                    if (i >= 0) t = t.slice(0, i);
                    return !t || t === "start";
                  });
                }

                function onFunction(id, name, listener) {
                  var on0, on1, sit = start$1(name) ? init : set$3;
                  return function() {
                    var schedule = sit(this, id),
                        on = schedule.on;

                    // If this node shared a dispatch with the previous node,
                    // just assign the updated shared dispatch and we’re done!
                    // Otherwise, copy-on-write.
                    if (on !== on0) (on1 = (on0 = on).copy()).on(name, listener);

                    schedule.on = on1;
                  };
                }

                var transition_on = function(name, listener) {
                  var id = this._id;

                  return arguments.length < 2
                      ? get$1(this.node(), id).on.on(name)
                      : this.each(onFunction(id, name, listener));
                };

                function removeFunction(id) {
                  return function() {
                    var parent = this.parentNode;
                    for (var i in this.__transition) if (+i !== id) return;
                    if (parent) parent.removeChild(this);
                  };
                }

                var transition_remove = function() {
                  return this.on("end.remove", removeFunction(this._id));
                };

                var transition_select = function(select$$1) {
                  var name = this._name,
                      id = this._id;

                  if (typeof select$$1 !== "function") select$$1 = selector(select$$1);

                  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
                    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
                      if ((node = group[i]) && (subnode = select$$1.call(node, node.__data__, i, group))) {
                        if ("__data__" in node) subnode.__data__ = node.__data__;
                        subgroup[i] = subnode;
                        schedule(subgroup[i], name, id, i, subgroup, get$1(node, id));
                      }
                    }
                  }

                  return new Transition(subgroups, this._parents, name, id);
                };

                var transition_selectAll = function(select$$1) {
                  var name = this._name,
                      id = this._id;

                  if (typeof select$$1 !== "function") select$$1 = selectorAll(select$$1);

                  for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
                    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
                      if (node = group[i]) {
                        for (var children = select$$1.call(node, node.__data__, i, group), child, inherit = get$1(node, id), k = 0, l = children.length; k < l; ++k) {
                          if (child = children[k]) {
                            schedule(child, name, id, k, children, inherit);
                          }
                        }
                        subgroups.push(children);
                        parents.push(node);
                      }
                    }
                  }

                  return new Transition(subgroups, parents, name, id);
                };

                var Selection$1 = selection.prototype.constructor;

                var transition_selection = function() {
                  return new Selection$1(this._groups, this._parents);
                };

                function styleRemove$1(name, interpolate$$1) {
                  var value00,
                      value10,
                      interpolate0;
                  return function() {
                    var style = window(this).getComputedStyle(this, null),
                        value0 = style.getPropertyValue(name),
                        value1 = (this.style.removeProperty(name), style.getPropertyValue(name));
                    return value0 === value1 ? null
                        : value0 === value00 && value1 === value10 ? interpolate0
                        : interpolate0 = interpolate$$1(value00 = value0, value10 = value1);
                  };
                }

                function styleRemoveEnd(name) {
                  return function() {
                    this.style.removeProperty(name);
                  };
                }

                function styleConstant$1(name, interpolate$$1, value1) {
                  var value00,
                      interpolate0;
                  return function() {
                    var value0 = window(this).getComputedStyle(this, null).getPropertyValue(name);
                    return value0 === value1 ? null
                        : value0 === value00 ? interpolate0
                        : interpolate0 = interpolate$$1(value00 = value0, value1);
                  };
                }

                function styleFunction$1(name, interpolate$$1, value) {
                  var value00,
                      value10,
                      interpolate0;
                  return function() {
                    var style = window(this).getComputedStyle(this, null),
                        value0 = style.getPropertyValue(name),
                        value1 = value(this);
                    if (value1 == null) value1 = (this.style.removeProperty(name), style.getPropertyValue(name));
                    return value0 === value1 ? null
                        : value0 === value00 && value1 === value10 ? interpolate0
                        : interpolate0 = interpolate$$1(value00 = value0, value10 = value1);
                  };
                }

                var transition_style = function(name, value, priority) {
                  var i = (name += "") === "transform" ? interpolateTransformCss : interpolate$1;
                  return value == null ? this
                          .styleTween(name, styleRemove$1(name, i))
                          .on("end.style." + name, styleRemoveEnd(name))
                      : this.styleTween(name, typeof value === "function"
                          ? styleFunction$1(name, i, tweenValue(this, "style." + name, value))
                          : styleConstant$1(name, i, value), priority);
                };

                function styleTween(name, value, priority) {
                  function tween() {
                    var node = this, i = value.apply(node, arguments);
                    return i && function(t) {
                      node.style.setProperty(name, i(t), priority);
                    };
                  }
                  tween._value = value;
                  return tween;
                }

                var transition_styleTween = function(name, value, priority) {
                  var key = "style." + (name += "");
                  if (arguments.length < 2) return (key = this.tween(key)) && key._value;
                  if (value == null) return this.tween(key, null);
                  if (typeof value !== "function") throw new Error;
                  return this.tween(key, styleTween(name, value, priority == null ? "" : priority));
                };

                function textConstant$1(value) {
                  return function() {
                    this.textContent = value;
                  };
                }

                function textFunction$1(value) {
                  return function() {
                    var value1 = value(this);
                    this.textContent = value1 == null ? "" : value1;
                  };
                }

                var transition_text = function(value) {
                  return this.tween("text", typeof value === "function"
                      ? textFunction$1(tweenValue(this, "text", value))
                      : textConstant$1(value == null ? "" : value + ""));
                };

                var transition_transition = function() {
                  var name = this._name,
                      id0 = this._id,
                      id1 = newId();

                  for (var groups = this._groups, m = groups.length, j = 0; j < m; ++j) {
                    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
                      if (node = group[i]) {
                        var inherit = get$1(node, id0);
                        schedule(node, name, id1, i, group, {
                          time: inherit.time + inherit.delay + inherit.duration,
                          delay: 0,
                          duration: inherit.duration,
                          ease: inherit.ease
                        });
                      }
                    }
                  }

                  return new Transition(groups, this._parents, name, id1);
                };

                var id = 0;

                function Transition(groups, parents, name, id) {
                  this._groups = groups;
                  this._parents = parents;
                  this._name = name;
                  this._id = id;
                }

                function transition(name) {
                  return selection().transition(name);
                }

                function newId() {
                  return ++id;
                }

                var selection_prototype = selection.prototype;

                Transition.prototype = transition.prototype = {
                  constructor: Transition,
                  select: transition_select,
                  selectAll: transition_selectAll,
                  filter: transition_filter,
                  merge: transition_merge,
                  selection: transition_selection,
                  transition: transition_transition,
                  call: selection_prototype.call,
                  nodes: selection_prototype.nodes,
                  node: selection_prototype.node,
                  size: selection_prototype.size,
                  empty: selection_prototype.empty,
                  each: selection_prototype.each,
                  on: transition_on,
                  attr: transition_attr,
                  attrTween: transition_attrTween,
                  style: transition_style,
                  styleTween: transition_styleTween,
                  text: transition_text,
                  remove: transition_remove,
                  tween: transition_tween,
                  delay: transition_delay,
                  duration: transition_duration,
                  ease: transition_ease
                };

                var defaultTiming = {
                  time: null, // Set on use.
                  delay: 0,
                  duration: 250,
                  ease: cubicInOut
                };

                function inherit(node, id) {
                  var timing;
                  while (!(timing = node.__transition) || !(timing = timing[id])) {
                    if (!(node = node.parentNode)) {
                      return defaultTiming.time = now(), defaultTiming;
                    }
                  }
                  return timing;
                }

                var selection_transition = function(name) {
                  var id,
                      timing;

                  if (name instanceof Transition) {
                    id = name._id, name = name._name;
                  } else {
                    id = newId(), (timing = defaultTiming).time = now(), name = name == null ? null : name + "";
                  }

                  for (var groups = this._groups, m = groups.length, j = 0; j < m; ++j) {
                    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
                      if (node = group[i]) {
                        schedule(node, name, id, i, group, timing || inherit(node, id));
                      }
                    }
                  }

                  return new Transition(groups, this._parents, name, id);
                };

                selection.prototype.interrupt = selection_interrupt;
                selection.prototype.transition = selection_transition;

                var root$1 = [null];

                var active = function(node, name) {
                  var schedules = node.__transition,
                      schedule,
                      i;

                  if (schedules) {
                    name = name == null ? null : name + "";
                    for (i in schedules) {
                      if ((schedule = schedules[i]).state > SCHEDULED && schedule.name === name) {
                        return new Transition([[node]], root$1, name, +i);
                      }
                    }
                  }

                  return null;
                };

                var slice$4 = Array.prototype.slice;

                var identity$5 = function(x) {
                  return x;
                };

                var top = 1;
                var right = 2;
                var bottom = 3;
                var left = 4;
                var epsilon$2 = 1e-6;

                function translateX(scale0, scale1, d) {
                  var x = scale0(d);
                  return "translate(" + (isFinite(x) ? x : scale1(d)) + ",0)";
                }

                function translateY(scale0, scale1, d) {
                  var y = scale0(d);
                  return "translate(0," + (isFinite(y) ? y : scale1(d)) + ")";
                }

                function center(scale) {
                  var offset = scale.bandwidth() / 2;
                  if (scale.round()) offset = Math.round(offset);
                  return function(d) {
                    return scale(d) + offset;
                  };
                }

                function entering() {
                  return !this.__axis;
                }

                function axis(orient, scale) {
                  var tickArguments = [],
                      tickValues = null,
                      tickFormat = null,
                      tickSizeInner = 6,
                      tickSizeOuter = 6,
                      tickPadding = 3;

                  function axis(context) {
                    var values = tickValues == null ? (scale.ticks ? scale.ticks.apply(scale, tickArguments) : scale.domain()) : tickValues,
                        format = tickFormat == null ? (scale.tickFormat ? scale.tickFormat.apply(scale, tickArguments) : identity$5) : tickFormat,
                        spacing = Math.max(tickSizeInner, 0) + tickPadding,
                        transform = orient === top || orient === bottom ? translateX : translateY,
                        range = scale.range(),
                        range0 = range[0] + 0.5,
                        range1 = range[range.length - 1] + 0.5,
                        position = (scale.bandwidth ? center : identity$5)(scale.copy()),
                        selection = context.selection ? context.selection() : context,
                        path = selection.selectAll(".domain").data([null]),
                        tick = selection.selectAll(".tick").data(values, scale).order(),
                        tickExit = tick.exit(),
                        tickEnter = tick.enter().append("g").attr("class", "tick"),
                        line = tick.select("line"),
                        text = tick.select("text"),
                        k = orient === top || orient === left ? -1 : 1,
                        x, y = orient === left || orient === right ? (x = "x", "y") : (x = "y", "x");

                    path = path.merge(path.enter().insert("path", ".tick")
                        .attr("class", "domain")
                        .attr("stroke", "#000"));

                    tick = tick.merge(tickEnter);

                    line = line.merge(tickEnter.append("line")
                        .attr("stroke", "#000")
                        .attr(x + "2", k * tickSizeInner)
                        .attr(y + "1", 0.5)
                        .attr(y + "2", 0.5));

                    text = text.merge(tickEnter.append("text")
                        .attr("fill", "#000")
                        .attr(x, k * spacing)
                        .attr(y, 0.5)
                        .attr("dy", orient === top ? "0em" : orient === bottom ? "0.71em" : "0.32em"));

                    if (context !== selection) {
                      path = path.transition(context);
                      tick = tick.transition(context);
                      line = line.transition(context);
                      text = text.transition(context);

                      tickExit = tickExit.transition(context)
                          .attr("opacity", epsilon$2)
                          .attr("transform", function(d) { return transform(position, this.parentNode.__axis || position, d); });

                      tickEnter
                          .attr("opacity", epsilon$2)
                          .attr("transform", function(d) { return transform(this.parentNode.__axis || position, position, d); });
                    }

                    tickExit.remove();

                    path
                        .attr("d", orient === left || orient == right
                            ? "M" + k * tickSizeOuter + "," + range0 + "H0.5V" + range1 + "H" + k * tickSizeOuter
                            : "M" + range0 + "," + k * tickSizeOuter + "V0.5H" + range1 + "V" + k * tickSizeOuter);

                    tick
                        .attr("opacity", 1)
                        .attr("transform", function(d) { return transform(position, position, d); });

                    line
                        .attr(x + "2", k * tickSizeInner);

                    text
                        .attr(x, k * spacing)
                        .text(format);

                    selection.filter(entering)
                        .attr("fill", "none")
                        .attr("font-size", 10)
                        .attr("font-family", "sans-serif")
                        .attr("text-anchor", orient === right ? "start" : orient === left ? "end" : "middle");

                    selection
                        .each(function() { this.__axis = position; });
                  }

                  axis.scale = function(_) {
                    return arguments.length ? (scale = _, axis) : scale;
                  };

                  axis.ticks = function() {
                    return tickArguments = slice$4.call(arguments), axis;
                  };

                  axis.tickArguments = function(_) {
                    return arguments.length ? (tickArguments = _ == null ? [] : slice$4.call(_), axis) : tickArguments.slice();
                  };

                  axis.tickValues = function(_) {
                    return arguments.length ? (tickValues = _ == null ? null : slice$4.call(_), axis) : tickValues && tickValues.slice();
                  };

                  axis.tickFormat = function(_) {
                    return arguments.length ? (tickFormat = _, axis) : tickFormat;
                  };

                  axis.tickSize = function(_) {
                    return arguments.length ? (tickSizeInner = tickSizeOuter = +_, axis) : tickSizeInner;
                  };

                  axis.tickSizeInner = function(_) {
                    return arguments.length ? (tickSizeInner = +_, axis) : tickSizeInner;
                  };

                  axis.tickSizeOuter = function(_) {
                    return arguments.length ? (tickSizeOuter = +_, axis) : tickSizeOuter;
                  };

                  axis.tickPadding = function(_) {
                    return arguments.length ? (tickPadding = +_, axis) : tickPadding;
                  };

                  return axis;
                }

                function axisTop(scale) {
                  return axis(top, scale);
                }

                function axisRight(scale) {
                  return axis(right, scale);
                }

                function axisBottom(scale) {
                  return axis(bottom, scale);
                }

                function axisLeft(scale) {
                  return axis(left, scale);
                }

                function defaultSeparation(a, b) {
                  return a.parent === b.parent ? 1 : 2;
                }

                function meanX(children) {
                  return children.reduce(meanXReduce, 0) / children.length;
                }

                function meanXReduce(x, c) {
                  return x + c.x;
                }

                function maxY(children) {
                  return 1 + children.reduce(maxYReduce, 0);
                }

                function maxYReduce(y, c) {
                  return Math.max(y, c.y);
                }

                function leafLeft(node) {
                  var children;
                  while (children = node.children) node = children[0];
                  return node;
                }

                function leafRight(node) {
                  var children;
                  while (children = node.children) node = children[children.length - 1];
                  return node;
                }

                var cluster = function() {
                  var separation = defaultSeparation,
                      dx = 1,
                      dy = 1,
                      nodeSize = false;

                  function cluster(root) {
                    var previousNode,
                        x = 0;

                    // First walk, computing the initial x & y values.
                    root.eachAfter(function(node) {
                      var children = node.children;
                      if (children) {
                        node.x = meanX(children);
                        node.y = maxY(children);
                      } else {
                        node.x = previousNode ? x += separation(node, previousNode) : 0;
                        node.y = 0;
                        previousNode = node;
                      }
                    });

                    var left = leafLeft(root),
                        right = leafRight(root),
                        x0 = left.x - separation(left, right) / 2,
                        x1 = right.x + separation(right, left) / 2;

                    // Second walk, normalizing x & y to the desired size.
                    return root.eachAfter(nodeSize ? function(node) {
                      node.x = (node.x - root.x) * dx;
                      node.y = (root.y - node.y) * dy;
                    } : function(node) {
                      node.x = (node.x - x0) / (x1 - x0) * dx;
                      node.y = (1 - (root.y ? node.y / root.y : 1)) * dy;
                    });
                  }

                  cluster.separation = function(x) {
                    return arguments.length ? (separation = x, cluster) : separation;
                  };

                  cluster.size = function(x) {
                    return arguments.length ? (nodeSize = false, dx = +x[0], dy = +x[1], cluster) : (nodeSize ? null : [dx, dy]);
                  };

                  cluster.nodeSize = function(x) {
                    return arguments.length ? (nodeSize = true, dx = +x[0], dy = +x[1], cluster) : (nodeSize ? [dx, dy] : null);
                  };

                  return cluster;
                };

                var node_each = function(callback) {
                  var node = this, current, next = [node], children, i, n;
                  do {
                    current = next.reverse(), next = [];
                    while (node = current.pop()) {
                      callback(node), children = node.children;
                      if (children) for (i = 0, n = children.length; i < n; ++i) {
                        next.push(children[i]);
                      }
                    }
                  } while (next.length);
                  return this;
                };

                var node_eachBefore = function(callback) {
                  var node = this, nodes = [node], children, i;
                  while (node = nodes.pop()) {
                    callback(node), children = node.children;
                    if (children) for (i = children.length - 1; i >= 0; --i) {
                      nodes.push(children[i]);
                    }
                  }
                  return this;
                };

                var node_eachAfter = function(callback) {
                  var node = this, nodes = [node], next = [], children, i, n;
                  while (node = nodes.pop()) {
                    next.push(node), children = node.children;
                    if (children) for (i = 0, n = children.length; i < n; ++i) {
                      nodes.push(children[i]);
                    }
                  }
                  while (node = next.pop()) {
                    callback(node);
                  }
                  return this;
                };

                var node_sum = function(value) {
                  return this.eachAfter(function(node) {
                    var sum = +value(node.data) || 0,
                        children = node.children,
                        i = children && children.length;
                    while (--i >= 0) sum += children[i].value;
                    node.value = sum;
                  });
                };

                var node_sort = function(compare) {
                  return this.eachBefore(function(node) {
                    if (node.children) {
                      node.children.sort(compare);
                    }
                  });
                };

                var node_path = function(end) {
                  var start = this,
                      ancestor = leastCommonAncestor(start, end),
                      nodes = [start];
                  while (start !== ancestor) {
                    start = start.parent;
                    nodes.push(start);
                  }
                  var k = nodes.length;
                  while (end !== ancestor) {
                    nodes.splice(k, 0, end);
                    end = end.parent;
                  }
                  return nodes;
                };

                function leastCommonAncestor(a, b) {
                  if (a === b) return a;
                  var aNodes = a.ancestors(),
                      bNodes = b.ancestors(),
                      c = null;
                  a = aNodes.pop();
                  b = bNodes.pop();
                  while (a === b) {
                    c = a;
                    a = aNodes.pop();
                    b = bNodes.pop();
                  }
                  return c;
                }

                var node_ancestors = function() {
                  var node = this, nodes = [node];
                  while (node = node.parent) {
                    nodes.push(node);
                  }
                  return nodes;
                };

                var node_descendants = function() {
                  var nodes = [];
                  this.each(function(node) {
                    nodes.push(node);
                  });
                  return nodes;
                };

                var node_leaves = function() {
                  var leaves = [];
                  this.eachBefore(function(node) {
                    if (!node.children) {
                      leaves.push(node);
                    }
                  });
                  return leaves;
                };

                var node_links = function() {
                  var root = this, links = [];
                  root.each(function(node) {
                    if (node !== root) { // Don’t include the root’s parent, if any.
                      links.push({source: node.parent, target: node});
                    }
                  });
                  return links;
                };

                function hierarchy(data, children) {
                  var root = new Node(data),
                      valued = +data.value && (root.value = data.value),
                      node,
                      nodes = [root],
                      child,
                      childs,
                      i,
                      n;

                  if (children == null) children = defaultChildren;

                  while (node = nodes.pop()) {
                    if (valued) node.value = +node.data.value;
                    if ((childs = children(node.data)) && (n = childs.length)) {
                      node.children = new Array(n);
                      for (i = n - 1; i >= 0; --i) {
                        nodes.push(child = node.children[i] = new Node(childs[i]));
                        child.parent = node;
                        child.depth = node.depth + 1;
                      }
                    }
                  }

                  return root.eachBefore(computeHeight);
                }

                function node_copy() {
                  return hierarchy(this).eachBefore(copyData);
                }

                function defaultChildren(d) {
                  return d.children;
                }

                function copyData(node) {
                  node.data = node.data.data;
                }

                function computeHeight(node) {
                  var height = 0;
                  do node.height = height;
                  while ((node = node.parent) && (node.height < ++height));
                }

                function Node(data) {
                  this.data = data;
                  this.depth =
                  this.height = 0;
                  this.parent = null;
                }

                Node.prototype = hierarchy.prototype = {
                  constructor: Node,
                  each: node_each,
                  eachAfter: node_eachAfter,
                  eachBefore: node_eachBefore,
                  sum: node_sum,
                  sort: node_sort,
                  path: node_path,
                  ancestors: node_ancestors,
                  descendants: node_descendants,
                  leaves: node_leaves,
                  links: node_links,
                  copy: node_copy
                };

                function Node$2(value) {
                  this._ = value;
                  this.next = null;
                }

                var shuffle$1 = function(array) {
                  var i,
                      n = (array = array.slice()).length,
                      head = null,
                      node = head;

                  while (n) {
                    var next = new Node$2(array[n - 1]);
                    if (node) node = node.next = next;
                    else node = head = next;
                    array[i] = array[--n];
                  }

                  return {
                    head: head,
                    tail: node
                  };
                };

                var enclose = function(circles) {
                  return encloseN(shuffle$1(circles), []);
                };

                function encloses(a, b) {
                  var dx = b.x - a.x,
                      dy = b.y - a.y,
                      dr = a.r - b.r;
                  return dr * dr + 1e-6 > dx * dx + dy * dy;
                }

                // Returns the smallest circle that contains circles L and intersects circles B.
                function encloseN(L, B) {
                  var circle,
                      l0 = null,
                      l1 = L.head,
                      l2,
                      p1;

                  switch (B.length) {
                    case 1: circle = enclose1(B[0]); break;
                    case 2: circle = enclose2(B[0], B[1]); break;
                    case 3: circle = enclose3(B[0], B[1], B[2]); break;
                  }

                  while (l1) {
                    p1 = l1._, l2 = l1.next;
                    if (!circle || !encloses(circle, p1)) {

                      // Temporarily truncate L before l1.
                      if (l0) L.tail = l0, l0.next = null;
                      else L.head = L.tail = null;

                      B.push(p1);
                      circle = encloseN(L, B); // Note: reorders L!
                      B.pop();

                      // Move l1 to the front of L and reconnect the truncated list L.
                      if (L.head) l1.next = L.head, L.head = l1;
                      else l1.next = null, L.head = L.tail = l1;
                      l0 = L.tail, l0.next = l2;

                    } else {
                      l0 = l1;
                    }
                    l1 = l2;
                  }

                  L.tail = l0;
                  return circle;
                }

                function enclose1(a) {
                  return {
                    x: a.x,
                    y: a.y,
                    r: a.r
                  };
                }

                function enclose2(a, b) {
                  var x1 = a.x, y1 = a.y, r1 = a.r,
                      x2 = b.x, y2 = b.y, r2 = b.r,
                      x21 = x2 - x1, y21 = y2 - y1, r21 = r2 - r1,
                      l = Math.sqrt(x21 * x21 + y21 * y21);
                  return {
                    x: (x1 + x2 + x21 / l * r21) / 2,
                    y: (y1 + y2 + y21 / l * r21) / 2,
                    r: (l + r1 + r2) / 2
                  };
                }

                function enclose3(a, b, c) {
                  var x1 = a.x, y1 = a.y, r1 = a.r,
                      x2 = b.x, y2 = b.y, r2 = b.r,
                      x3 = c.x, y3 = c.y, r3 = c.r,
                      a2 = 2 * (x1 - x2),
                      b2 = 2 * (y1 - y2),
                      c2 = 2 * (r2 - r1),
                      d2 = x1 * x1 + y1 * y1 - r1 * r1 - x2 * x2 - y2 * y2 + r2 * r2,
                      a3 = 2 * (x1 - x3),
                      b3 = 2 * (y1 - y3),
                      c3 = 2 * (r3 - r1),
                      d3 = x1 * x1 + y1 * y1 - r1 * r1 - x3 * x3 - y3 * y3 + r3 * r3,
                      ab = a3 * b2 - a2 * b3,
                      xa = (b2 * d3 - b3 * d2) / ab - x1,
                      xb = (b3 * c2 - b2 * c3) / ab,
                      ya = (a3 * d2 - a2 * d3) / ab - y1,
                      yb = (a2 * c3 - a3 * c2) / ab,
                      A = xb * xb + yb * yb - 1,
                      B = 2 * (xa * xb + ya * yb + r1),
                      C = xa * xa + ya * ya - r1 * r1,
                      r = (-B - Math.sqrt(B * B - 4 * A * C)) / (2 * A);
                  return {
                    x: xa + xb * r + x1,
                    y: ya + yb * r + y1,
                    r: r
                  };
                }

                function place(a, b, c) {
                  var ax = a.x,
                      ay = a.y,
                      da = b.r + c.r,
                      db = a.r + c.r,
                      dx = b.x - ax,
                      dy = b.y - ay,
                      dc = dx * dx + dy * dy;
                  if (dc) {
                    var x = 0.5 + ((db *= db) - (da *= da)) / (2 * dc),
                        y = Math.sqrt(Math.max(0, 2 * da * (db + dc) - (db -= dc) * db - da * da)) / (2 * dc);
                    c.x = ax + x * dx + y * dy;
                    c.y = ay + x * dy - y * dx;
                  } else {
                    c.x = ax + db;
                    c.y = ay;
                  }
                }

                function intersects(a, b) {
                  var dx = b.x - a.x,
                      dy = b.y - a.y,
                      dr = a.r + b.r;
                  return dr * dr > dx * dx + dy * dy;
                }

                function distance2(circle, x, y) {
                  var dx = circle.x - x,
                      dy = circle.y - y;
                  return dx * dx + dy * dy;
                }

                function Node$1(circle) {
                  this._ = circle;
                  this.next = null;
                  this.previous = null;
                }

                function packEnclose(circles) {
                  if (!(n = circles.length)) return 0;

                  var a, b, c, n;

                  // Place the first circle.
                  a = circles[0], a.x = 0, a.y = 0;
                  if (!(n > 1)) return a.r;

                  // Place the second circle.
                  b = circles[1], a.x = -b.r, b.x = a.r, b.y = 0;
                  if (!(n > 2)) return a.r + b.r;

                  // Place the third circle.
                  place(b, a, c = circles[2]);

                  // Initialize the weighted centroid.
                  var aa = a.r * a.r,
                      ba = b.r * b.r,
                      ca = c.r * c.r,
                      oa = aa + ba + ca,
                      ox = aa * a.x + ba * b.x + ca * c.x,
                      oy = aa * a.y + ba * b.y + ca * c.y,
                      cx, cy, i, j, k, sj, sk;

                  // Initialize the front-chain using the first three circles a, b and c.
                  a = new Node$1(a), b = new Node$1(b), c = new Node$1(c);
                  a.next = c.previous = b;
                  b.next = a.previous = c;
                  c.next = b.previous = a;

                  // Attempt to place each remaining circle…
                  pack: for (i = 3; i < n; ++i) {
                    place(a._, b._, c = circles[i]), c = new Node$1(c);

                    // If there are only three elements in the front-chain…
                    if ((k = a.previous) === (j = b.next)) {
                      // If the new circle intersects the third circle,
                      // rotate the front chain to try the next position.
                      if (intersects(j._, c._)) {
                        a = b, b = j, --i;
                        continue pack;
                      }
                    }

                    // Find the closest intersecting circle on the front-chain, if any.
                    else {
                      sj = j._.r, sk = k._.r;
                      do {
                        if (sj <= sk) {
                          if (intersects(j._, c._)) {
                            b = j, a.next = b, b.previous = a, --i;
                            continue pack;
                          }
                          j = j.next, sj += j._.r;
                        } else {
                          if (intersects(k._, c._)) {
                            a = k, a.next = b, b.previous = a, --i;
                            continue pack;
                          }
                          k = k.previous, sk += k._.r;
                        }
                      } while (j !== k.next);
                    }

                    // Success! Insert the new circle c between a and b.
                    c.previous = a, c.next = b, a.next = b.previous = b = c;

                    // Update the weighted centroid.
                    oa += ca = c._.r * c._.r;
                    ox += ca * c._.x;
                    oy += ca * c._.y;

                    // Compute the new closest circle a to centroid.
                    aa = distance2(a._, cx = ox / oa, cy = oy / oa);
                    while ((c = c.next) !== b) {
                      if ((ca = distance2(c._, cx, cy)) < aa) {
                        a = c, aa = ca;
                      }
                    }
                    b = a.next;
                  }

                  // Compute the enclosing circle of the front chain.
                  a = [b._], c = b; while ((c = c.next) !== b) a.push(c._); c = enclose(a);

                  // Translate the circles to put the enclosing circle around the origin.
                  for (i = 0; i < n; ++i) a = circles[i], a.x -= c.x, a.y -= c.y;

                  return c.r;
                }

                var siblings = function(circles) {
                  packEnclose(circles);
                  return circles;
                };

                function optional(f) {
                  return f == null ? null : required(f);
                }

                function required(f) {
                  if (typeof f !== "function") throw new Error;
                  return f;
                }

                function constantZero() {
                  return 0;
                }

                var constant$6 = function(x) {
                  return function() {
                    return x;
                  };
                };

                function defaultRadius(d) {
                  return Math.sqrt(d.value);
                }

                var index = function() {
                  var radius = null,
                      dx = 1,
                      dy = 1,
                      padding = constantZero;

                  function pack(root) {
                    root.x = dx / 2, root.y = dy / 2;
                    if (radius) {
                      root.eachBefore(radiusLeaf(radius))
                          .eachAfter(packChildren(padding, 0.5))
                          .eachBefore(translateChild(1));
                    } else {
                      root.eachBefore(radiusLeaf(defaultRadius))
                          .eachAfter(packChildren(constantZero, 1))
                          .eachAfter(packChildren(padding, root.r / Math.min(dx, dy)))
                          .eachBefore(translateChild(Math.min(dx, dy) / (2 * root.r)));
                    }
                    return root;
                  }

                  pack.radius = function(x) {
                    return arguments.length ? (radius = optional(x), pack) : radius;
                  };

                  pack.size = function(x) {
                    return arguments.length ? (dx = +x[0], dy = +x[1], pack) : [dx, dy];
                  };

                  pack.padding = function(x) {
                    return arguments.length ? (padding = typeof x === "function" ? x : constant$6(+x), pack) : padding;
                  };

                  return pack;
                };

                function radiusLeaf(radius) {
                  return function(node) {
                    if (!node.children) {
                      node.r = Math.max(0, +radius(node) || 0);
                    }
                  };
                }

                function packChildren(padding, k) {
                  return function(node) {
                    if (children = node.children) {
                      var children,
                          i,
                          n = children.length,
                          r = padding(node) * k || 0,
                          e;

                      if (r) for (i = 0; i < n; ++i) children[i].r += r;
                      e = packEnclose(children);
                      if (r) for (i = 0; i < n; ++i) children[i].r -= r;
                      node.r = e + r;
                    }
                  };
                }

                function translateChild(k) {
                  return function(node) {
                    var parent = node.parent;
                    node.r *= k;
                    if (parent) {
                      node.x = parent.x + k * node.x;
                      node.y = parent.y + k * node.y;
                    }
                  };
                }

                var roundNode = function(node) {
                  node.x0 = Math.round(node.x0);
                  node.y0 = Math.round(node.y0);
                  node.x1 = Math.round(node.x1);
                  node.y1 = Math.round(node.y1);
                };

                var treemapDice = function(parent, x0, y0, x1, y1) {
                  var nodes = parent.children,
                      node,
                      i = -1,
                      n = nodes.length,
                      k = parent.value && (x1 - x0) / parent.value;

                  while (++i < n) {
                    node = nodes[i], node.y0 = y0, node.y1 = y1;
                    node.x0 = x0, node.x1 = x0 += node.value * k;
                  }
                };

                var partition = function() {
                  var dx = 1,
                      dy = 1,
                      padding = 0,
                      round = false;

                  function partition(root) {
                    var n = root.height + 1;
                    root.x0 =
                    root.y0 = padding;
                    root.x1 = dx;
                    root.y1 = dy / n;
                    root.eachBefore(positionNode(dy, n));
                    if (round) root.eachBefore(roundNode);
                    return root;
                  }

                  function positionNode(dy, n) {
                    return function(node) {
                      if (node.children) {
                        treemapDice(node, node.x0, dy * (node.depth + 1) / n, node.x1, dy * (node.depth + 2) / n);
                      }
                      var x0 = node.x0,
                          y0 = node.y0,
                          x1 = node.x1 - padding,
                          y1 = node.y1 - padding;
                      if (x1 < x0) x0 = x1 = (x0 + x1) / 2;
                      if (y1 < y0) y0 = y1 = (y0 + y1) / 2;
                      node.x0 = x0;
                      node.y0 = y0;
                      node.x1 = x1;
                      node.y1 = y1;
                    };
                  }

                  partition.round = function(x) {
                    return arguments.length ? (round = !!x, partition) : round;
                  };

                  partition.size = function(x) {
                    return arguments.length ? (dx = +x[0], dy = +x[1], partition) : [dx, dy];
                  };

                  partition.padding = function(x) {
                    return arguments.length ? (padding = +x, partition) : padding;
                  };

                  return partition;
                };

                var keyPrefix$1 = "$";
                var preroot = {depth: -1};
                var ambiguous = {};

                function defaultId(d) {
                  return d.id;
                }

                function defaultParentId(d) {
                  return d.parentId;
                }

                var stratify = function() {
                  var id = defaultId,
                      parentId = defaultParentId;

                  function stratify(data) {
                    var d,
                        i,
                        n = data.length,
                        root,
                        parent,
                        node,
                        nodes = new Array(n),
                        nodeId,
                        nodeKey,
                        nodeByKey = {};

                    for (i = 0; i < n; ++i) {
                      d = data[i], node = nodes[i] = new Node(d);
                      if ((nodeId = id(d, i, data)) != null && (nodeId += "")) {
                        nodeKey = keyPrefix$1 + (node.id = nodeId);
                        nodeByKey[nodeKey] = nodeKey in nodeByKey ? ambiguous : node;
                      }
                    }

                    for (i = 0; i < n; ++i) {
                      node = nodes[i], nodeId = parentId(data[i], i, data);
                      if (nodeId == null || !(nodeId += "")) {
                        if (root) throw new Error("multiple roots");
                        root = node;
                      } else {
                        parent = nodeByKey[keyPrefix$1 + nodeId];
                        if (!parent) throw new Error("missing: " + nodeId);
                        if (parent === ambiguous) throw new Error("ambiguous: " + nodeId);
                        if (parent.children) parent.children.push(node);
                        else parent.children = [node];
                        node.parent = parent;
                      }
                    }

                    if (!root) throw new Error("no root");
                    root.parent = preroot;
                    root.eachBefore(function(node) { node.depth = node.parent.depth + 1; --n; }).eachBefore(computeHeight);
                    root.parent = null;
                    if (n > 0) throw new Error("cycle");

                    return root;
                  }

                  stratify.id = function(x) {
                    return arguments.length ? (id = required(x), stratify) : id;
                  };

                  stratify.parentId = function(x) {
                    return arguments.length ? (parentId = required(x), stratify) : parentId;
                  };

                  return stratify;
                };

                function defaultSeparation$1(a, b) {
                  return a.parent === b.parent ? 1 : 2;
                }

                // function radialSeparation(a, b) {
                //   return (a.parent === b.parent ? 1 : 2) / a.depth;
                // }

                // This function is used to traverse the left contour of a subtree (or
                // subforest). It returns the successor of v on this contour. This successor is
                // either given by the leftmost child of v or by the thread of v. The function
                // returns null if and only if v is on the highest level of its subtree.
                function nextLeft(v) {
                  var children = v.children;
                  return children ? children[0] : v.t;
                }

                // This function works analogously to nextLeft.
                function nextRight(v) {
                  var children = v.children;
                  return children ? children[children.length - 1] : v.t;
                }

                // Shifts the current subtree rooted at w+. This is done by increasing
                // prelim(w+) and mod(w+) by shift.
                function moveSubtree(wm, wp, shift) {
                  var change = shift / (wp.i - wm.i);
                  wp.c -= change;
                  wp.s += shift;
                  wm.c += change;
                  wp.z += shift;
                  wp.m += shift;
                }

                // All other shifts, applied to the smaller subtrees between w- and w+, are
                // performed by this function. To prepare the shifts, we have to adjust
                // change(w+), shift(w+), and change(w-).
                function executeShifts(v) {
                  var shift = 0,
                      change = 0,
                      children = v.children,
                      i = children.length,
                      w;
                  while (--i >= 0) {
                    w = children[i];
                    w.z += shift;
                    w.m += shift;
                    shift += w.s + (change += w.c);
                  }
                }

                // If vi-’s ancestor is a sibling of v, returns vi-’s ancestor. Otherwise,
                // returns the specified (default) ancestor.
                function nextAncestor(vim, v, ancestor) {
                  return vim.a.parent === v.parent ? vim.a : ancestor;
                }

                function TreeNode(node, i) {
                  this._ = node;
                  this.parent = null;
                  this.children = null;
                  this.A = null; // default ancestor
                  this.a = this; // ancestor
                  this.z = 0; // prelim
                  this.m = 0; // mod
                  this.c = 0; // change
                  this.s = 0; // shift
                  this.t = null; // thread
                  this.i = i; // number
                }

                TreeNode.prototype = Object.create(Node.prototype);

                function treeRoot(root) {
                  var tree = new TreeNode(root, 0),
                      node,
                      nodes = [tree],
                      child,
                      children,
                      i,
                      n;

                  while (node = nodes.pop()) {
                    if (children = node._.children) {
                      node.children = new Array(n = children.length);
                      for (i = n - 1; i >= 0; --i) {
                        nodes.push(child = node.children[i] = new TreeNode(children[i], i));
                        child.parent = node;
                      }
                    }
                  }

                  (tree.parent = new TreeNode(null, 0)).children = [tree];
                  return tree;
                }

                // Node-link tree diagram using the Reingold-Tilford "tidy" algorithm
                var tree = function() {
                  var separation = defaultSeparation$1,
                      dx = 1,
                      dy = 1,
                      nodeSize = null;

                  function tree(root) {
                    var t = treeRoot(root);

                    // Compute the layout using Buchheim et al.’s algorithm.
                    t.eachAfter(firstWalk), t.parent.m = -t.z;
                    t.eachBefore(secondWalk);

                    // If a fixed node size is specified, scale x and y.
                    if (nodeSize) root.eachBefore(sizeNode);

                    // If a fixed tree size is specified, scale x and y based on the extent.
                    // Compute the left-most, right-most, and depth-most nodes for extents.
                    else {
                      var left = root,
                          right = root,
                          bottom = root;
                      root.eachBefore(function(node) {
                        if (node.x < left.x) left = node;
                        if (node.x > right.x) right = node;
                        if (node.depth > bottom.depth) bottom = node;
                      });
                      var s = left === right ? 1 : separation(left, right) / 2,
                          tx = s - left.x,
                          kx = dx / (right.x + s + tx),
                          ky = dy / (bottom.depth || 1);
                      root.eachBefore(function(node) {
                        node.x = (node.x + tx) * kx;
                        node.y = node.depth * ky;
                      });
                    }

                    return root;
                  }

                  // Computes a preliminary x-coordinate for v. Before that, FIRST WALK is
                  // applied recursively to the children of v, as well as the function
                  // APPORTION. After spacing out the children by calling EXECUTE SHIFTS, the
                  // node v is placed to the midpoint of its outermost children.
                  function firstWalk(v) {
                    var children = v.children,
                        siblings = v.parent.children,
                        w = v.i ? siblings[v.i - 1] : null;
                    if (children) {
                      executeShifts(v);
                      var midpoint = (children[0].z + children[children.length - 1].z) / 2;
                      if (w) {
                        v.z = w.z + separation(v._, w._);
                        v.m = v.z - midpoint;
                      } else {
                        v.z = midpoint;
                      }
                    } else if (w) {
                      v.z = w.z + separation(v._, w._);
                    }
                    v.parent.A = apportion(v, w, v.parent.A || siblings[0]);
                  }

                  // Computes all real x-coordinates by summing up the modifiers recursively.
                  function secondWalk(v) {
                    v._.x = v.z + v.parent.m;
                    v.m += v.parent.m;
                  }

                  // The core of the algorithm. Here, a new subtree is combined with the
                  // previous subtrees. Threads are used to traverse the inside and outside
                  // contours of the left and right subtree up to the highest common level. The
                  // vertices used for the traversals are vi+, vi-, vo-, and vo+, where the
                  // superscript o means outside and i means inside, the subscript - means left
                  // subtree and + means right subtree. For summing up the modifiers along the
                  // contour, we use respective variables si+, si-, so-, and so+. Whenever two
                  // nodes of the inside contours conflict, we compute the left one of the
                  // greatest uncommon ancestors using the function ANCESTOR and call MOVE
                  // SUBTREE to shift the subtree and prepare the shifts of smaller subtrees.
                  // Finally, we add a new thread (if necessary).
                  function apportion(v, w, ancestor) {
                    if (w) {
                      var vip = v,
                          vop = v,
                          vim = w,
                          vom = vip.parent.children[0],
                          sip = vip.m,
                          sop = vop.m,
                          sim = vim.m,
                          som = vom.m,
                          shift;
                      while (vim = nextRight(vim), vip = nextLeft(vip), vim && vip) {
                        vom = nextLeft(vom);
                        vop = nextRight(vop);
                        vop.a = v;
                        shift = vim.z + sim - vip.z - sip + separation(vim._, vip._);
                        if (shift > 0) {
                          moveSubtree(nextAncestor(vim, v, ancestor), v, shift);
                          sip += shift;
                          sop += shift;
                        }
                        sim += vim.m;
                        sip += vip.m;
                        som += vom.m;
                        sop += vop.m;
                      }
                      if (vim && !nextRight(vop)) {
                        vop.t = vim;
                        vop.m += sim - sop;
                      }
                      if (vip && !nextLeft(vom)) {
                        vom.t = vip;
                        vom.m += sip - som;
                        ancestor = v;
                      }
                    }
                    return ancestor;
                  }

                  function sizeNode(node) {
                    node.x *= dx;
                    node.y = node.depth * dy;
                  }

                  tree.separation = function(x) {
                    return arguments.length ? (separation = x, tree) : separation;
                  };

                  tree.size = function(x) {
                    return arguments.length ? (nodeSize = false, dx = +x[0], dy = +x[1], tree) : (nodeSize ? null : [dx, dy]);
                  };

                  tree.nodeSize = function(x) {
                    return arguments.length ? (nodeSize = true, dx = +x[0], dy = +x[1], tree) : (nodeSize ? [dx, dy] : null);
                  };

                  return tree;
                };

                var treemapSlice = function(parent, x0, y0, x1, y1) {
                  var nodes = parent.children,
                      node,
                      i = -1,
                      n = nodes.length,
                      k = parent.value && (y1 - y0) / parent.value;

                  while (++i < n) {
                    node = nodes[i], node.x0 = x0, node.x1 = x1;
                    node.y0 = y0, node.y1 = y0 += node.value * k;
                  }
                };

                var phi = (1 + Math.sqrt(5)) / 2;

                function squarifyRatio(ratio, parent, x0, y0, x1, y1) {
                  var rows = [],
                      nodes = parent.children,
                      row,
                      nodeValue,
                      i0 = 0,
                      i1,
                      n = nodes.length,
                      dx, dy,
                      value = parent.value,
                      sumValue,
                      minValue,
                      maxValue,
                      newRatio,
                      minRatio,
                      alpha,
                      beta;

                  while (i0 < n) {
                    dx = x1 - x0, dy = y1 - y0;
                    minValue = maxValue = sumValue = nodes[i0].value;
                    alpha = Math.max(dy / dx, dx / dy) / (value * ratio);
                    beta = sumValue * sumValue * alpha;
                    minRatio = Math.max(maxValue / beta, beta / minValue);

                    // Keep adding nodes while the aspect ratio maintains or improves.
                    for (i1 = i0 + 1; i1 < n; ++i1) {
                      sumValue += nodeValue = nodes[i1].value;
                      if (nodeValue < minValue) minValue = nodeValue;
                      if (nodeValue > maxValue) maxValue = nodeValue;
                      beta = sumValue * sumValue * alpha;
                      newRatio = Math.max(maxValue / beta, beta / minValue);
                      if (newRatio > minRatio) { sumValue -= nodeValue; break; }
                      minRatio = newRatio;
                    }

                    // Position and record the row orientation.
                    rows.push(row = {value: sumValue, dice: dx < dy, children: nodes.slice(i0, i1)});
                    if (row.dice) treemapDice(row, x0, y0, x1, value ? y0 += dy * sumValue / value : y1);
                    else treemapSlice(row, x0, y0, value ? x0 += dx * sumValue / value : x1, y1);
                    value -= sumValue, i0 = i1;
                  }

                  return rows;
                }

                var squarify = (function custom(ratio) {

                  function squarify(parent, x0, y0, x1, y1) {
                    squarifyRatio(ratio, parent, x0, y0, x1, y1);
                  }

                  squarify.ratio = function(x) {
                    return custom((x = +x) > 1 ? x : 1);
                  };

                  return squarify;
                })(phi);

                var index$1 = function() {
                  var tile = squarify,
                      round = false,
                      dx = 1,
                      dy = 1,
                      paddingStack = [0],
                      paddingInner = constantZero,
                      paddingTop = constantZero,
                      paddingRight = constantZero,
                      paddingBottom = constantZero,
                      paddingLeft = constantZero;

                  function treemap(root) {
                    root.x0 =
                    root.y0 = 0;
                    root.x1 = dx;
                    root.y1 = dy;
                    root.eachBefore(positionNode);
                    paddingStack = [0];
                    if (round) root.eachBefore(roundNode);
                    return root;
                  }

                  function positionNode(node) {
                    var p = paddingStack[node.depth],
                        x0 = node.x0 + p,
                        y0 = node.y0 + p,
                        x1 = node.x1 - p,
                        y1 = node.y1 - p;
                    if (x1 < x0) x0 = x1 = (x0 + x1) / 2;
                    if (y1 < y0) y0 = y1 = (y0 + y1) / 2;
                    node.x0 = x0;
                    node.y0 = y0;
                    node.x1 = x1;
                    node.y1 = y1;
                    if (node.children) {
                      p = paddingStack[node.depth + 1] = paddingInner(node) / 2;
                      x0 += paddingLeft(node) - p;
                      y0 += paddingTop(node) - p;
                      x1 -= paddingRight(node) - p;
                      y1 -= paddingBottom(node) - p;
                      if (x1 < x0) x0 = x1 = (x0 + x1) / 2;
                      if (y1 < y0) y0 = y1 = (y0 + y1) / 2;
                      tile(node, x0, y0, x1, y1);
                    }
                  }

                  treemap.round = function(x) {
                    return arguments.length ? (round = !!x, treemap) : round;
                  };

                  treemap.size = function(x) {
                    return arguments.length ? (dx = +x[0], dy = +x[1], treemap) : [dx, dy];
                  };

                  treemap.tile = function(x) {
                    return arguments.length ? (tile = required(x), treemap) : tile;
                  };

                  treemap.padding = function(x) {
                    return arguments.length ? treemap.paddingInner(x).paddingOuter(x) : treemap.paddingInner();
                  };

                  treemap.paddingInner = function(x) {
                    return arguments.length ? (paddingInner = typeof x === "function" ? x : constant$6(+x), treemap) : paddingInner;
                  };

                  treemap.paddingOuter = function(x) {
                    return arguments.length ? treemap.paddingTop(x).paddingRight(x).paddingBottom(x).paddingLeft(x) : treemap.paddingTop();
                  };

                  treemap.paddingTop = function(x) {
                    return arguments.length ? (paddingTop = typeof x === "function" ? x : constant$6(+x), treemap) : paddingTop;
                  };

                  treemap.paddingRight = function(x) {
                    return arguments.length ? (paddingRight = typeof x === "function" ? x : constant$6(+x), treemap) : paddingRight;
                  };

                  treemap.paddingBottom = function(x) {
                    return arguments.length ? (paddingBottom = typeof x === "function" ? x : constant$6(+x), treemap) : paddingBottom;
                  };

                  treemap.paddingLeft = function(x) {
                    return arguments.length ? (paddingLeft = typeof x === "function" ? x : constant$6(+x), treemap) : paddingLeft;
                  };

                  return treemap;
                };

                var binary = function(parent, x0, y0, x1, y1) {
                  var nodes = parent.children,
                      i, n = nodes.length,
                      sum, sums = new Array(n + 1);

                  for (sums[0] = sum = i = 0; i < n; ++i) {
                    sums[i + 1] = sum += nodes[i].value;
                  }

                  partition(0, n, parent.value, x0, y0, x1, y1);

                  function partition(i, j, value, x0, y0, x1, y1) {
                    if (i >= j - 1) {
                      var node = nodes[i];
                      node.x0 = x0, node.y0 = y0;
                      node.x1 = x1, node.y1 = y1;
                      return;
                    }

                    var valueOffset = sums[i],
                        valueTarget = (value / 2) + valueOffset,
                        k = i + 1,
                        hi = j - 1;

                    while (k < hi) {
                      var mid = k + hi >>> 1;
                      if (sums[mid] < valueTarget) k = mid + 1;
                      else hi = mid;
                    }

                    var valueLeft = sums[k] - valueOffset,
                        valueRight = value - valueLeft;

                    if ((y1 - y0) > (x1 - x0)) {
                      var yk = (y0 * valueRight + y1 * valueLeft) / value;
                      partition(i, k, valueLeft, x0, y0, x1, yk);
                      partition(k, j, valueRight, x0, yk, x1, y1);
                    } else {
                      var xk = (x0 * valueRight + x1 * valueLeft) / value;
                      partition(i, k, valueLeft, x0, y0, xk, y1);
                      partition(k, j, valueRight, xk, y0, x1, y1);
                    }
                  }
                };

                var sliceDice = function(parent, x0, y0, x1, y1) {
                  (parent.depth & 1 ? treemapSlice : treemapDice)(parent, x0, y0, x1, y1);
                };

                var resquarify = (function custom(ratio) {

                  function resquarify(parent, x0, y0, x1, y1) {
                    if ((rows = parent._squarify) && (rows.ratio === ratio)) {
                      var rows,
                          row,
                          nodes,
                          i,
                          j = -1,
                          n,
                          m = rows.length,
                          value = parent.value;

                      while (++j < m) {
                        row = rows[j], nodes = row.children;
                        for (i = row.value = 0, n = nodes.length; i < n; ++i) row.value += nodes[i].value;
                        if (row.dice) treemapDice(row, x0, y0, x1, y0 += (y1 - y0) * row.value / value);
                        else treemapSlice(row, x0, y0, x0 += (x1 - x0) * row.value / value, y1);
                        value -= row.value;
                      }
                    } else {
                      parent._squarify = rows = squarifyRatio(ratio, parent, x0, y0, x1, y1);
                      rows.ratio = ratio;
                    }
                  }

                  resquarify.ratio = function(x) {
                    return custom((x = +x) > 1 ? x : 1);
                  };

                  return resquarify;
                })(phi);

                var center$1 = function(x, y) {
                  var nodes;

                  if (x == null) x = 0;
                  if (y == null) y = 0;

                  function force() {
                    var i,
                        n = nodes.length,
                        node,
                        sx = 0,
                        sy = 0;

                    for (i = 0; i < n; ++i) {
                      node = nodes[i], sx += node.x, sy += node.y;
                    }

                    for (sx = sx / n - x, sy = sy / n - y, i = 0; i < n; ++i) {
                      node = nodes[i], node.x -= sx, node.y -= sy;
                    }
                  }

                  force.initialize = function(_) {
                    nodes = _;
                  };

                  force.x = function(_) {
                    return arguments.length ? (x = +_, force) : x;
                  };

                  force.y = function(_) {
                    return arguments.length ? (y = +_, force) : y;
                  };

                  return force;
                };

                var constant$7 = function(x) {
                  return function() {
                    return x;
                  };
                };

                var jiggle = function() {
                  return (Math.random() - 0.5) * 1e-6;
                };

                function x$1(d) {
                  return d.x + d.vx;
                }

                function y$1(d) {
                  return d.y + d.vy;
                }

                var collide = function(radius) {
                  var nodes,
                      radii,
                      strength = 1,
                      iterations = 1;

                  if (typeof radius !== "function") radius = constant$7(radius == null ? 1 : +radius);

                  function force() {
                    var i, n = nodes.length,
                        tree,
                        node,
                        xi,
                        yi,
                        ri,
                        ri2;

                    for (var k = 0; k < iterations; ++k) {
                      tree = quadtree(nodes, x$1, y$1).visitAfter(prepare);
                      for (i = 0; i < n; ++i) {
                        node = nodes[i];
                        ri = radii[i], ri2 = ri * ri;
                        xi = node.x + node.vx;
                        yi = node.y + node.vy;
                        tree.visit(apply);
                      }
                    }

                    function apply(quad, x0, y0, x1, y1) {
                      var data = quad.data, rj = quad.r, r = ri + rj;
                      if (data) {
                        if (data.index > i) {
                          var x = xi - data.x - data.vx,
                              y = yi - data.y - data.vy,
                              l = x * x + y * y;
                          if (l < r * r) {
                            if (x === 0) x = jiggle(), l += x * x;
                            if (y === 0) y = jiggle(), l += y * y;
                            l = (r - (l = Math.sqrt(l))) / l * strength;
                            node.vx += (x *= l) * (r = (rj *= rj) / (ri2 + rj));
                            node.vy += (y *= l) * r;
                            data.vx -= x * (r = 1 - r);
                            data.vy -= y * r;
                          }
                        }
                        return;
                      }
                      return x0 > xi + r || x1 < xi - r || y0 > yi + r || y1 < yi - r;
                    }
                  }

                  function prepare(quad) {
                    if (quad.data) return quad.r = radii[quad.data.index];
                    for (var i = quad.r = 0; i < 4; ++i) {
                      if (quad[i] && quad[i].r > quad.r) {
                        quad.r = quad[i].r;
                      }
                    }
                  }

                  function initialize() {
                    if (!nodes) return;
                    var i, n = nodes.length;
                    radii = new Array(n);
                    for (i = 0; i < n; ++i) radii[i] = +radius(nodes[i], i, nodes);
                  }

                  force.initialize = function(_) {
                    nodes = _;
                    initialize();
                  };

                  force.iterations = function(_) {
                    return arguments.length ? (iterations = +_, force) : iterations;
                  };

                  force.strength = function(_) {
                    return arguments.length ? (strength = +_, force) : strength;
                  };

                  force.radius = function(_) {
                    return arguments.length ? (radius = typeof _ === "function" ? _ : constant$7(+_), initialize(), force) : radius;
                  };

                  return force;
                };

                function index$2(d, i) {
                  return i;
                }

                function find(nodeById, nodeId) {
                  var node = nodeById.get(nodeId);
                  if (!node) throw new Error("missing: " + nodeId);
                  return node;
                }

                var link = function(links) {
                  var id = index$2,
                      strength = defaultStrength,
                      strengths,
                      distance = constant$7(30),
                      distances,
                      nodes,
                      count,
                      bias,
                      iterations = 1;

                  if (links == null) links = [];

                  function defaultStrength(link) {
                    return 1 / Math.min(count[link.source.index], count[link.target.index]);
                  }

                  function force(alpha) {
                    for (var k = 0, n = links.length; k < iterations; ++k) {
                      for (var i = 0, link, source, target, x, y, l, b; i < n; ++i) {
                        link = links[i], source = link.source, target = link.target;
                        x = target.x + target.vx - source.x - source.vx || jiggle();
                        y = target.y + target.vy - source.y - source.vy || jiggle();
                        l = Math.sqrt(x * x + y * y);
                        l = (l - distances[i]) / l * alpha * strengths[i];
                        x *= l, y *= l;
                        target.vx -= x * (b = bias[i]);
                        target.vy -= y * b;
                        source.vx += x * (b = 1 - b);
                        source.vy += y * b;
                      }
                    }
                  }

                  function initialize() {
                    if (!nodes) return;

                    var i,
                        n = nodes.length,
                        m = links.length,
                        nodeById = map$1(nodes, id),
                        link;

                    for (i = 0, count = new Array(n); i < n; ++i) {
                      count[i] = 0;
                    }

                    for (i = 0; i < m; ++i) {
                      link = links[i], link.index = i;
                      if (typeof link.source !== "object") link.source = find(nodeById, link.source);
                      if (typeof link.target !== "object") link.target = find(nodeById, link.target);
                      ++count[link.source.index], ++count[link.target.index];
                    }

                    for (i = 0, bias = new Array(m); i < m; ++i) {
                      link = links[i], bias[i] = count[link.source.index] / (count[link.source.index] + count[link.target.index]);
                    }

                    strengths = new Array(m), initializeStrength();
                    distances = new Array(m), initializeDistance();
                  }

                  function initializeStrength() {
                    if (!nodes) return;

                    for (var i = 0, n = links.length; i < n; ++i) {
                      strengths[i] = +strength(links[i], i, links);
                    }
                  }

                  function initializeDistance() {
                    if (!nodes) return;

                    for (var i = 0, n = links.length; i < n; ++i) {
                      distances[i] = +distance(links[i], i, links);
                    }
                  }

                  force.initialize = function(_) {
                    nodes = _;
                    initialize();
                  };

                  force.links = function(_) {
                    return arguments.length ? (links = _, initialize(), force) : links;
                  };

                  force.id = function(_) {
                    return arguments.length ? (id = _, force) : id;
                  };

                  force.iterations = function(_) {
                    return arguments.length ? (iterations = +_, force) : iterations;
                  };

                  force.strength = function(_) {
                    return arguments.length ? (strength = typeof _ === "function" ? _ : constant$7(+_), initializeStrength(), force) : strength;
                  };

                  force.distance = function(_) {
                    return arguments.length ? (distance = typeof _ === "function" ? _ : constant$7(+_), initializeDistance(), force) : distance;
                  };

                  return force;
                };

                function x$2(d) {
                  return d.x;
                }

                function y$2(d) {
                  return d.y;
                }

                var initialRadius = 10;
                var initialAngle = Math.PI * (3 - Math.sqrt(5));

                var simulation = function(nodes) {
                  var simulation,
                      alpha = 1,
                      alphaMin = 0.001,
                      alphaDecay = 1 - Math.pow(alphaMin, 1 / 300),
                      alphaTarget = 0,
                      velocityDecay = 0.6,
                      forces = map$1(),
                      stepper = timer(step),
                      event = dispatch("tick", "end");

                  if (nodes == null) nodes = [];

                  function step() {
                    tick();
                    event.call("tick", simulation);
                    if (alpha < alphaMin) {
                      stepper.stop();
                      event.call("end", simulation);
                    }
                  }

                  function tick() {
                    var i, n = nodes.length, node;

                    alpha += (alphaTarget - alpha) * alphaDecay;

                    forces.each(function(force) {
                      force(alpha);
                    });

                    for (i = 0; i < n; ++i) {
                      node = nodes[i];
                      if (node.fx == null) node.x += node.vx *= velocityDecay;
                      else node.x = node.fx, node.vx = 0;
                      if (node.fy == null) node.y += node.vy *= velocityDecay;
                      else node.y = node.fy, node.vy = 0;
                    }
                  }

                  function initializeNodes() {
                    for (var i = 0, n = nodes.length, node; i < n; ++i) {
                      node = nodes[i], node.index = i;
                      if (isNaN(node.x) || isNaN(node.y)) {
                        var radius = initialRadius * Math.sqrt(i), angle = i * initialAngle;
                        node.x = radius * Math.cos(angle);
                        node.y = radius * Math.sin(angle);
                      }
                      if (isNaN(node.vx) || isNaN(node.vy)) {
                        node.vx = node.vy = 0;
                      }
                    }
                  }

                  function initializeForce(force) {
                    if (force.initialize) force.initialize(nodes);
                    return force;
                  }

                  initializeNodes();

                  return simulation = {
                    tick: tick,

                    restart: function() {
                      return stepper.restart(step), simulation;
                    },

                    stop: function() {
                      return stepper.stop(), simulation;
                    },

                    nodes: function(_) {
                      return arguments.length ? (nodes = _, initializeNodes(), forces.each(initializeForce), simulation) : nodes;
                    },

                    alpha: function(_) {
                      return arguments.length ? (alpha = +_, simulation) : alpha;
                    },

                    alphaMin: function(_) {
                      return arguments.length ? (alphaMin = +_, simulation) : alphaMin;
                    },

                    alphaDecay: function(_) {
                      return arguments.length ? (alphaDecay = +_, simulation) : +alphaDecay;
                    },

                    alphaTarget: function(_) {
                      return arguments.length ? (alphaTarget = +_, simulation) : alphaTarget;
                    },

                    velocityDecay: function(_) {
                      return arguments.length ? (velocityDecay = 1 - _, simulation) : 1 - velocityDecay;
                    },

                    force: function(name, _) {
                      return arguments.length > 1 ? ((_ == null ? forces.remove(name) : forces.set(name, initializeForce(_))), simulation) : forces.get(name);
                    },

                    find: function(x, y, radius) {
                      var i = 0,
                          n = nodes.length,
                          dx,
                          dy,
                          d2,
                          node,
                          closest;

                      if (radius == null) radius = Infinity;
                      else radius *= radius;

                      for (i = 0; i < n; ++i) {
                        node = nodes[i];
                        dx = x - node.x;
                        dy = y - node.y;
                        d2 = dx * dx + dy * dy;
                        if (d2 < radius) closest = node, radius = d2;
                      }

                      return closest;
                    },

                    on: function(name, _) {
                      return arguments.length > 1 ? (event.on(name, _), simulation) : event.on(name);
                    }
                  };
                };

                var manyBody = function() {
                  var nodes,
                      node,
                      alpha,
                      strength = constant$7(-30),
                      strengths,
                      distanceMin2 = 1,
                      distanceMax2 = Infinity,
                      theta2 = 0.81;

                  function force(_) {
                    var i, n = nodes.length, tree = quadtree(nodes, x$2, y$2).visitAfter(accumulate);
                    for (alpha = _, i = 0; i < n; ++i) node = nodes[i], tree.visit(apply);
                  }

                  function initialize() {
                    if (!nodes) return;
                    var i, n = nodes.length;
                    strengths = new Array(n);
                    for (i = 0; i < n; ++i) strengths[i] = +strength(nodes[i], i, nodes);
                  }

                  function accumulate(quad) {
                    var strength = 0, q, c, x$$1, y$$1, i;

                    // For internal nodes, accumulate forces from child quadrants.
                    if (quad.length) {
                      for (x$$1 = y$$1 = i = 0; i < 4; ++i) {
                        if ((q = quad[i]) && (c = q.value)) {
                          strength += c, x$$1 += c * q.x, y$$1 += c * q.y;
                        }
                      }
                      quad.x = x$$1 / strength;
                      quad.y = y$$1 / strength;
                    }

                    // For leaf nodes, accumulate forces from coincident quadrants.
                    else {
                      q = quad;
                      q.x = q.data.x;
                      q.y = q.data.y;
                      do strength += strengths[q.data.index];
                      while (q = q.next);
                    }

                    quad.value = strength;
                  }

                  function apply(quad, x1, _, x2) {
                    if (!quad.value) return true;

                    var x$$1 = quad.x - node.x,
                        y$$1 = quad.y - node.y,
                        w = x2 - x1,
                        l = x$$1 * x$$1 + y$$1 * y$$1;

                    // Apply the Barnes-Hut approximation if possible.
                    // Limit forces for very close nodes; randomize direction if coincident.
                    if (w * w / theta2 < l) {
                      if (l < distanceMax2) {
                        if (x$$1 === 0) x$$1 = jiggle(), l += x$$1 * x$$1;
                        if (y$$1 === 0) y$$1 = jiggle(), l += y$$1 * y$$1;
                        if (l < distanceMin2) l = Math.sqrt(distanceMin2 * l);
                        node.vx += x$$1 * quad.value * alpha / l;
                        node.vy += y$$1 * quad.value * alpha / l;
                      }
                      return true;
                    }

                    // Otherwise, process points directly.
                    else if (quad.length || l >= distanceMax2) return;

                    // Limit forces for very close nodes; randomize direction if coincident.
                    if (quad.data !== node || quad.next) {
                      if (x$$1 === 0) x$$1 = jiggle(), l += x$$1 * x$$1;
                      if (y$$1 === 0) y$$1 = jiggle(), l += y$$1 * y$$1;
                      if (l < distanceMin2) l = Math.sqrt(distanceMin2 * l);
                    }

                    do if (quad.data !== node) {
                      w = strengths[quad.data.index] * alpha / l;
                      node.vx += x$$1 * w;
                      node.vy += y$$1 * w;
                    } while (quad = quad.next);
                  }

                  force.initialize = function(_) {
                    nodes = _;
                    initialize();
                  };

                  force.strength = function(_) {
                    return arguments.length ? (strength = typeof _ === "function" ? _ : constant$7(+_), initialize(), force) : strength;
                  };

                  force.distanceMin = function(_) {
                    return arguments.length ? (distanceMin2 = _ * _, force) : Math.sqrt(distanceMin2);
                  };

                  force.distanceMax = function(_) {
                    return arguments.length ? (distanceMax2 = _ * _, force) : Math.sqrt(distanceMax2);
                  };

                  force.theta = function(_) {
                    return arguments.length ? (theta2 = _ * _, force) : Math.sqrt(theta2);
                  };

                  return force;
                };

                var x$3 = function(x) {
                  var strength = constant$7(0.1),
                      nodes,
                      strengths,
                      xz;

                  if (typeof x !== "function") x = constant$7(x == null ? 0 : +x);

                  function force(alpha) {
                    for (var i = 0, n = nodes.length, node; i < n; ++i) {
                      node = nodes[i], node.vx += (xz[i] - node.x) * strengths[i] * alpha;
                    }
                  }

                  function initialize() {
                    if (!nodes) return;
                    var i, n = nodes.length;
                    strengths = new Array(n);
                    xz = new Array(n);
                    for (i = 0; i < n; ++i) {
                      strengths[i] = isNaN(xz[i] = +x(nodes[i], i, nodes)) ? 0 : +strength(nodes[i], i, nodes);
                    }
                  }

                  force.initialize = function(_) {
                    nodes = _;
                    initialize();
                  };

                  force.strength = function(_) {
                    return arguments.length ? (strength = typeof _ === "function" ? _ : constant$7(+_), initialize(), force) : strength;
                  };

                  force.x = function(_) {
                    return arguments.length ? (x = typeof _ === "function" ? _ : constant$7(+_), initialize(), force) : x;
                  };

                  return force;
                };

                var y$3 = function(y) {
                  var strength = constant$7(0.1),
                      nodes,
                      strengths,
                      yz;

                  if (typeof y !== "function") y = constant$7(y == null ? 0 : +y);

                  function force(alpha) {
                    for (var i = 0, n = nodes.length, node; i < n; ++i) {
                      node = nodes[i], node.vy += (yz[i] - node.y) * strengths[i] * alpha;
                    }
                  }

                  function initialize() {
                    if (!nodes) return;
                    var i, n = nodes.length;
                    strengths = new Array(n);
                    yz = new Array(n);
                    for (i = 0; i < n; ++i) {
                      strengths[i] = isNaN(yz[i] = +y(nodes[i], i, nodes)) ? 0 : +strength(nodes[i], i, nodes);
                    }
                  }

                  force.initialize = function(_) {
                    nodes = _;
                    initialize();
                  };

                  force.strength = function(_) {
                    return arguments.length ? (strength = typeof _ === "function" ? _ : constant$7(+_), initialize(), force) : strength;
                  };

                  force.y = function(_) {
                    return arguments.length ? (y = typeof _ === "function" ? _ : constant$7(+_), initialize(), force) : y;
                  };

                  return force;
                };

                function nopropagation() {
                  exports.event.stopImmediatePropagation();
                }

                var noevent = function() {
                  exports.event.preventDefault();
                  exports.event.stopImmediatePropagation();
                };

                var dragDisable = function(view) {
                  var root = view.document.documentElement,
                      selection$$1 = select(view).on("dragstart.drag", noevent, true);
                  if ("onselectstart" in root) {
                    selection$$1.on("selectstart.drag", noevent, true);
                  } else {
                    root.__noselect = root.style.MozUserSelect;
                    root.style.MozUserSelect = "none";
                  }
                };

                function yesdrag(view, noclick) {
                  var root = view.document.documentElement,
                      selection$$1 = select(view).on("dragstart.drag", null);
                  if (noclick) {
                    selection$$1.on("click.drag", noevent, true);
                    setTimeout(function() { selection$$1.on("click.drag", null); }, 0);
                  }
                  if ("onselectstart" in root) {
                    selection$$1.on("selectstart.drag", null);
                  } else {
                    root.style.MozUserSelect = root.__noselect;
                    delete root.__noselect;
                  }
                }

                var constant$8 = function(x) {
                  return function() {
                    return x;
                  };
                };

                function DragEvent(target, type, subject, id, active, x, y, dx, dy, dispatch) {
                  this.target = target;
                  this.type = type;
                  this.subject = subject;
                  this.identifier = id;
                  this.active = active;
                  this.x = x;
                  this.y = y;
                  this.dx = dx;
                  this.dy = dy;
                  this._ = dispatch;
                }

                DragEvent.prototype.on = function() {
                  var value = this._.on.apply(this._, arguments);
                  return value === this._ ? this : value;
                };

                // Ignore right-click, since that should open the context menu.
                function defaultFilter() {
                  return !exports.event.button;
                }

                function defaultContainer() {
                  return this.parentNode;
                }

                function defaultSubject(d) {
                  return d == null ? {x: exports.event.x, y: exports.event.y} : d;
                }

                var drag = function() {
                  var filter = defaultFilter,
                      container = defaultContainer,
                      subject = defaultSubject,
                      gestures = {},
                      listeners = dispatch("start", "drag", "end"),
                      active = 0,
                      mousemoving,
                      touchending;

                  function drag(selection$$1) {
                    selection$$1
                        .on("mousedown.drag", mousedowned)
                        .on("touchstart.drag", touchstarted)
                        .on("touchmove.drag", touchmoved)
                        .on("touchend.drag touchcancel.drag", touchended)
                        .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
                  }

                  function mousedowned() {
                    if (touchending || !filter.apply(this, arguments)) return;
                    var gesture = beforestart("mouse", container.apply(this, arguments), mouse, this, arguments);
                    if (!gesture) return;
                    select(exports.event.view).on("mousemove.drag", mousemoved, true).on("mouseup.drag", mouseupped, true);
                    dragDisable(exports.event.view);
                    nopropagation();
                    mousemoving = false;
                    gesture("start");
                  }

                  function mousemoved() {
                    noevent();
                    mousemoving = true;
                    gestures.mouse("drag");
                  }

                  function mouseupped() {
                    select(exports.event.view).on("mousemove.drag mouseup.drag", null);
                    yesdrag(exports.event.view, mousemoving);
                    noevent();
                    gestures.mouse("end");
                  }

                  function touchstarted() {
                    if (!filter.apply(this, arguments)) return;
                    var touches$$1 = exports.event.changedTouches,
                        c = container.apply(this, arguments),
                        n = touches$$1.length, i, gesture;

                    for (i = 0; i < n; ++i) {
                      if (gesture = beforestart(touches$$1[i].identifier, c, touch, this, arguments)) {
                        nopropagation();
                        gesture("start");
                      }
                    }
                  }

                  function touchmoved() {
                    var touches$$1 = exports.event.changedTouches,
                        n = touches$$1.length, i, gesture;

                    for (i = 0; i < n; ++i) {
                      if (gesture = gestures[touches$$1[i].identifier]) {
                        noevent();
                        gesture("drag");
                      }
                    }
                  }

                  function touchended() {
                    var touches$$1 = exports.event.changedTouches,
                        n = touches$$1.length, i, gesture;

                    if (touchending) clearTimeout(touchending);
                    touchending = setTimeout(function() { touchending = null; }, 500); // Ghost clicks are delayed!
                    for (i = 0; i < n; ++i) {
                      if (gesture = gestures[touches$$1[i].identifier]) {
                        nopropagation();
                        gesture("end");
                      }
                    }
                  }

                  function beforestart(id, container, point, that, args) {
                    var p = point(container, id), s, dx, dy,
                        sublisteners = listeners.copy();

                    if (!customEvent(new DragEvent(drag, "beforestart", s, id, active, p[0], p[1], 0, 0, sublisteners), function() {
                      if ((exports.event.subject = s = subject.apply(that, args)) == null) return false;
                      dx = s.x - p[0] || 0;
                      dy = s.y - p[1] || 0;
                      return true;
                    })) return;

                    return function gesture(type) {
                      var p0 = p, n;
                      switch (type) {
                        case "start": gestures[id] = gesture, n = active++; break;
                        case "end": delete gestures[id], --active; // nobreak
                        case "drag": p = point(container, id), n = active; break;
                      }
                      customEvent(new DragEvent(drag, type, s, id, n, p[0] + dx, p[1] + dy, p[0] - p0[0], p[1] - p0[1], sublisteners), sublisteners.apply, sublisteners, [type, that, args]);
                    };
                  }

                  drag.filter = function(_) {
                    return arguments.length ? (filter = typeof _ === "function" ? _ : constant$8(!!_), drag) : filter;
                  };

                  drag.container = function(_) {
                    return arguments.length ? (container = typeof _ === "function" ? _ : constant$8(_), drag) : container;
                  };

                  drag.subject = function(_) {
                    return arguments.length ? (subject = typeof _ === "function" ? _ : constant$8(_), drag) : subject;
                  };

                  drag.on = function() {
                    var value = listeners.on.apply(listeners, arguments);
                    return value === listeners ? drag : value;
                  };

                  return drag;
                };

                var constant$9 = function(x) {
                  return function() {
                    return x;
                  };
                };

                function x$4(d) {
                  return d[0];
                }

                function y$4(d) {
                  return d[1];
                }

                function RedBlackTree() {
                  this._ = null; // root node
                }

                function RedBlackNode(node) {
                  node.U = // parent node
                  node.C = // color - true for red, false for black
                  node.L = // left node
                  node.R = // right node
                  node.P = // previous node
                  node.N = null; // next node
                }

                RedBlackTree.prototype = {
                  constructor: RedBlackTree,

                  insert: function(after, node) {
                    var parent, grandpa, uncle;

                    if (after) {
                      node.P = after;
                      node.N = after.N;
                      if (after.N) after.N.P = node;
                      after.N = node;
                      if (after.R) {
                        after = after.R;
                        while (after.L) after = after.L;
                        after.L = node;
                      } else {
                        after.R = node;
                      }
                      parent = after;
                    } else if (this._) {
                      after = RedBlackFirst(this._);
                      node.P = null;
                      node.N = after;
                      after.P = after.L = node;
                      parent = after;
                    } else {
                      node.P = node.N = null;
                      this._ = node;
                      parent = null;
                    }
                    node.L = node.R = null;
                    node.U = parent;
                    node.C = true;

                    after = node;
                    while (parent && parent.C) {
                      grandpa = parent.U;
                      if (parent === grandpa.L) {
                        uncle = grandpa.R;
                        if (uncle && uncle.C) {
                          parent.C = uncle.C = false;
                          grandpa.C = true;
                          after = grandpa;
                        } else {
                          if (after === parent.R) {
                            RedBlackRotateLeft(this, parent);
                            after = parent;
                            parent = after.U;
                          }
                          parent.C = false;
                          grandpa.C = true;
                          RedBlackRotateRight(this, grandpa);
                        }
                      } else {
                        uncle = grandpa.L;
                        if (uncle && uncle.C) {
                          parent.C = uncle.C = false;
                          grandpa.C = true;
                          after = grandpa;
                        } else {
                          if (after === parent.L) {
                            RedBlackRotateRight(this, parent);
                            after = parent;
                            parent = after.U;
                          }
                          parent.C = false;
                          grandpa.C = true;
                          RedBlackRotateLeft(this, grandpa);
                        }
                      }
                      parent = after.U;
                    }
                    this._.C = false;
                  },

                  remove: function(node) {
                    if (node.N) node.N.P = node.P;
                    if (node.P) node.P.N = node.N;
                    node.N = node.P = null;

                    var parent = node.U,
                        sibling,
                        left = node.L,
                        right = node.R,
                        next,
                        red;

                    if (!left) next = right;
                    else if (!right) next = left;
                    else next = RedBlackFirst(right);

                    if (parent) {
                      if (parent.L === node) parent.L = next;
                      else parent.R = next;
                    } else {
                      this._ = next;
                    }

                    if (left && right) {
                      red = next.C;
                      next.C = node.C;
                      next.L = left;
                      left.U = next;
                      if (next !== right) {
                        parent = next.U;
                        next.U = node.U;
                        node = next.R;
                        parent.L = node;
                        next.R = right;
                        right.U = next;
                      } else {
                        next.U = parent;
                        parent = next;
                        node = next.R;
                      }
                    } else {
                      red = node.C;
                      node = next;
                    }

                    if (node) node.U = parent;
                    if (red) return;
                    if (node && node.C) { node.C = false; return; }

                    do {
                      if (node === this._) break;
                      if (node === parent.L) {
                        sibling = parent.R;
                        if (sibling.C) {
                          sibling.C = false;
                          parent.C = true;
                          RedBlackRotateLeft(this, parent);
                          sibling = parent.R;
                        }
                        if ((sibling.L && sibling.L.C)
                            || (sibling.R && sibling.R.C)) {
                          if (!sibling.R || !sibling.R.C) {
                            sibling.L.C = false;
                            sibling.C = true;
                            RedBlackRotateRight(this, sibling);
                            sibling = parent.R;
                          }
                          sibling.C = parent.C;
                          parent.C = sibling.R.C = false;
                          RedBlackRotateLeft(this, parent);
                          node = this._;
                          break;
                        }
                      } else {
                        sibling = parent.L;
                        if (sibling.C) {
                          sibling.C = false;
                          parent.C = true;
                          RedBlackRotateRight(this, parent);
                          sibling = parent.L;
                        }
                        if ((sibling.L && sibling.L.C)
                          || (sibling.R && sibling.R.C)) {
                          if (!sibling.L || !sibling.L.C) {
                            sibling.R.C = false;
                            sibling.C = true;
                            RedBlackRotateLeft(this, sibling);
                            sibling = parent.L;
                          }
                          sibling.C = parent.C;
                          parent.C = sibling.L.C = false;
                          RedBlackRotateRight(this, parent);
                          node = this._;
                          break;
                        }
                      }
                      sibling.C = true;
                      node = parent;
                      parent = parent.U;
                    } while (!node.C);

                    if (node) node.C = false;
                  }
                };

                function RedBlackRotateLeft(tree, node) {
                  var p = node,
                      q = node.R,
                      parent = p.U;

                  if (parent) {
                    if (parent.L === p) parent.L = q;
                    else parent.R = q;
                  } else {
                    tree._ = q;
                  }

                  q.U = parent;
                  p.U = q;
                  p.R = q.L;
                  if (p.R) p.R.U = p;
                  q.L = p;
                }

                function RedBlackRotateRight(tree, node) {
                  var p = node,
                      q = node.L,
                      parent = p.U;

                  if (parent) {
                    if (parent.L === p) parent.L = q;
                    else parent.R = q;
                  } else {
                    tree._ = q;
                  }

                  q.U = parent;
                  p.U = q;
                  p.L = q.R;
                  if (p.L) p.L.U = p;
                  q.R = p;
                }

                function RedBlackFirst(node) {
                  while (node.L) node = node.L;
                  return node;
                }

                function createEdge(left, right, v0, v1) {
                  var edge = [null, null],
                      index = edges.push(edge) - 1;
                  edge.left = left;
                  edge.right = right;
                  if (v0) setEdgeEnd(edge, left, right, v0);
                  if (v1) setEdgeEnd(edge, right, left, v1);
                  cells[left.index].halfedges.push(index);
                  cells[right.index].halfedges.push(index);
                  return edge;
                }

                function createBorderEdge(left, v0, v1) {
                  var edge = [v0, v1];
                  edge.left = left;
                  return edge;
                }

                function setEdgeEnd(edge, left, right, vertex) {
                  if (!edge[0] && !edge[1]) {
                    edge[0] = vertex;
                    edge.left = left;
                    edge.right = right;
                  } else if (edge.left === right) {
                    edge[1] = vertex;
                  } else {
                    edge[0] = vertex;
                  }
                }

                // Liang–Barsky line clipping.
                function clipEdge(edge, x0, y0, x1, y1) {
                  var a = edge[0],
                      b = edge[1],
                      ax = a[0],
                      ay = a[1],
                      bx = b[0],
                      by = b[1],
                      t0 = 0,
                      t1 = 1,
                      dx = bx - ax,
                      dy = by - ay,
                      r;

                  r = x0 - ax;
                  if (!dx && r > 0) return;
                  r /= dx;
                  if (dx < 0) {
                    if (r < t0) return;
                    if (r < t1) t1 = r;
                  } else if (dx > 0) {
                    if (r > t1) return;
                    if (r > t0) t0 = r;
                  }

                  r = x1 - ax;
                  if (!dx && r < 0) return;
                  r /= dx;
                  if (dx < 0) {
                    if (r > t1) return;
                    if (r > t0) t0 = r;
                  } else if (dx > 0) {
                    if (r < t0) return;
                    if (r < t1) t1 = r;
                  }

                  r = y0 - ay;
                  if (!dy && r > 0) return;
                  r /= dy;
                  if (dy < 0) {
                    if (r < t0) return;
                    if (r < t1) t1 = r;
                  } else if (dy > 0) {
                    if (r > t1) return;
                    if (r > t0) t0 = r;
                  }

                  r = y1 - ay;
                  if (!dy && r < 0) return;
                  r /= dy;
                  if (dy < 0) {
                    if (r > t1) return;
                    if (r > t0) t0 = r;
                  } else if (dy > 0) {
                    if (r < t0) return;
                    if (r < t1) t1 = r;
                  }

                  if (!(t0 > 0) && !(t1 < 1)) return true; // TODO Better check?

                  if (t0 > 0) edge[0] = [ax + t0 * dx, ay + t0 * dy];
                  if (t1 < 1) edge[1] = [ax + t1 * dx, ay + t1 * dy];
                  return true;
                }

                function connectEdge(edge, x0, y0, x1, y1) {
                  var v1 = edge[1];
                  if (v1) return true;

                  var v0 = edge[0],
                      left = edge.left,
                      right = edge.right,
                      lx = left[0],
                      ly = left[1],
                      rx = right[0],
                      ry = right[1],
                      fx = (lx + rx) / 2,
                      fy = (ly + ry) / 2,
                      fm,
                      fb;

                  if (ry === ly) {
                    if (fx < x0 || fx >= x1) return;
                    if (lx > rx) {
                      if (!v0) v0 = [fx, y0];
                      else if (v0[1] >= y1) return;
                      v1 = [fx, y1];
                    } else {
                      if (!v0) v0 = [fx, y1];
                      else if (v0[1] < y0) return;
                      v1 = [fx, y0];
                    }
                  } else {
                    fm = (lx - rx) / (ry - ly);
                    fb = fy - fm * fx;
                    if (fm < -1 || fm > 1) {
                      if (lx > rx) {
                        if (!v0) v0 = [(y0 - fb) / fm, y0];
                        else if (v0[1] >= y1) return;
                        v1 = [(y1 - fb) / fm, y1];
                      } else {
                        if (!v0) v0 = [(y1 - fb) / fm, y1];
                        else if (v0[1] < y0) return;
                        v1 = [(y0 - fb) / fm, y0];
                      }
                    } else {
                      if (ly < ry) {
                        if (!v0) v0 = [x0, fm * x0 + fb];
                        else if (v0[0] >= x1) return;
                        v1 = [x1, fm * x1 + fb];
                      } else {
                        if (!v0) v0 = [x1, fm * x1 + fb];
                        else if (v0[0] < x0) return;
                        v1 = [x0, fm * x0 + fb];
                      }
                    }
                  }

                  edge[0] = v0;
                  edge[1] = v1;
                  return true;
                }

                function clipEdges(x0, y0, x1, y1) {
                  var i = edges.length,
                      edge;

                  while (i--) {
                    if (!connectEdge(edge = edges[i], x0, y0, x1, y1)
                        || !clipEdge(edge, x0, y0, x1, y1)
                        || !(Math.abs(edge[0][0] - edge[1][0]) > epsilon$3
                            || Math.abs(edge[0][1] - edge[1][1]) > epsilon$3)) {
                      delete edges[i];
                    }
                  }
                }

                function createCell(site) {
                  return cells[site.index] = {
                    site: site,
                    halfedges: []
                  };
                }

                function cellHalfedgeAngle(cell, edge) {
                  var site = cell.site,
                      va = edge.left,
                      vb = edge.right;
                  if (site === vb) vb = va, va = site;
                  if (vb) return Math.atan2(vb[1] - va[1], vb[0] - va[0]);
                  if (site === va) va = edge[1], vb = edge[0];
                  else va = edge[0], vb = edge[1];
                  return Math.atan2(va[0] - vb[0], vb[1] - va[1]);
                }

                function cellHalfedgeStart(cell, edge) {
                  return edge[+(edge.left !== cell.site)];
                }

                function cellHalfedgeEnd(cell, edge) {
                  return edge[+(edge.left === cell.site)];
                }

                function sortCellHalfedges() {
                  for (var i = 0, n = cells.length, cell, halfedges, j, m; i < n; ++i) {
                    if ((cell = cells[i]) && (m = (halfedges = cell.halfedges).length)) {
                      var index = new Array(m),
                          array = new Array(m);
                      for (j = 0; j < m; ++j) index[j] = j, array[j] = cellHalfedgeAngle(cell, edges[halfedges[j]]);
                      index.sort(function(i, j) { return array[j] - array[i]; });
                      for (j = 0; j < m; ++j) array[j] = halfedges[index[j]];
                      for (j = 0; j < m; ++j) halfedges[j] = array[j];
                    }
                  }
                }

                function clipCells(x0, y0, x1, y1) {
                  var nCells = cells.length,
                      iCell,
                      cell,
                      site,
                      iHalfedge,
                      halfedges,
                      nHalfedges,
                      start,
                      startX,
                      startY,
                      end,
                      endX,
                      endY,
                      cover = true;

                  for (iCell = 0; iCell < nCells; ++iCell) {
                    if (cell = cells[iCell]) {
                      site = cell.site;
                      halfedges = cell.halfedges;
                      iHalfedge = halfedges.length;

                      // Remove any dangling clipped edges.
                      while (iHalfedge--) {
                        if (!edges[halfedges[iHalfedge]]) {
                          halfedges.splice(iHalfedge, 1);
                        }
                      }

                      // Insert any border edges as necessary.
                      iHalfedge = 0, nHalfedges = halfedges.length;
                      while (iHalfedge < nHalfedges) {
                        end = cellHalfedgeEnd(cell, edges[halfedges[iHalfedge]]), endX = end[0], endY = end[1];
                        start = cellHalfedgeStart(cell, edges[halfedges[++iHalfedge % nHalfedges]]), startX = start[0], startY = start[1];
                        if (Math.abs(endX - startX) > epsilon$3 || Math.abs(endY - startY) > epsilon$3) {
                          halfedges.splice(iHalfedge, 0, edges.push(createBorderEdge(site, end,
                              Math.abs(endX - x0) < epsilon$3 && y1 - endY > epsilon$3 ? [x0, Math.abs(startX - x0) < epsilon$3 ? startY : y1]
                              : Math.abs(endY - y1) < epsilon$3 && x1 - endX > epsilon$3 ? [Math.abs(startY - y1) < epsilon$3 ? startX : x1, y1]
                              : Math.abs(endX - x1) < epsilon$3 && endY - y0 > epsilon$3 ? [x1, Math.abs(startX - x1) < epsilon$3 ? startY : y0]
                              : Math.abs(endY - y0) < epsilon$3 && endX - x0 > epsilon$3 ? [Math.abs(startY - y0) < epsilon$3 ? startX : x0, y0]
                              : null)) - 1);
                          ++nHalfedges;
                        }
                      }

                      if (nHalfedges) cover = false;
                    }
                  }

                  // If there weren’t any edges, have the closest site cover the extent.
                  // It doesn’t matter which corner of the extent we measure!
                  if (cover) {
                    var dx, dy, d2, dc = Infinity;

                    for (iCell = 0, cover = null; iCell < nCells; ++iCell) {
                      if (cell = cells[iCell]) {
                        site = cell.site;
                        dx = site[0] - x0;
                        dy = site[1] - y0;
                        d2 = dx * dx + dy * dy;
                        if (d2 < dc) dc = d2, cover = cell;
                      }
                    }

                    if (cover) {
                      var v00 = [x0, y0], v01 = [x0, y1], v11 = [x1, y1], v10 = [x1, y0];
                      cover.halfedges.push(
                        edges.push(createBorderEdge(site = cover.site, v00, v01)) - 1,
                        edges.push(createBorderEdge(site, v01, v11)) - 1,
                        edges.push(createBorderEdge(site, v11, v10)) - 1,
                        edges.push(createBorderEdge(site, v10, v00)) - 1
                      );
                    }
                  }

                  // Lastly delete any cells with no edges; these were entirely clipped.
                  for (iCell = 0; iCell < nCells; ++iCell) {
                    if (cell = cells[iCell]) {
                      if (!cell.halfedges.length) {
                        delete cells[iCell];
                      }
                    }
                  }
                }

                var circlePool = [];

                var firstCircle;

                function Circle() {
                  RedBlackNode(this);
                  this.x =
                  this.y =
                  this.arc =
                  this.site =
                  this.cy = null;
                }

                function attachCircle(arc) {
                  var lArc = arc.P,
                      rArc = arc.N;

                  if (!lArc || !rArc) return;

                  var lSite = lArc.site,
                      cSite = arc.site,
                      rSite = rArc.site;

                  if (lSite === rSite) return;

                  var bx = cSite[0],
                      by = cSite[1],
                      ax = lSite[0] - bx,
                      ay = lSite[1] - by,
                      cx = rSite[0] - bx,
                      cy = rSite[1] - by;

                  var d = 2 * (ax * cy - ay * cx);
                  if (d >= -epsilon2$1) return;

                  var ha = ax * ax + ay * ay,
                      hc = cx * cx + cy * cy,
                      x = (cy * ha - ay * hc) / d,
                      y = (ax * hc - cx * ha) / d;

                  var circle = circlePool.pop() || new Circle;
                  circle.arc = arc;
                  circle.site = cSite;
                  circle.x = x + bx;
                  circle.y = (circle.cy = y + by) + Math.sqrt(x * x + y * y); // y bottom

                  arc.circle = circle;

                  var before = null,
                      node = circles._;

                  while (node) {
                    if (circle.y < node.y || (circle.y === node.y && circle.x <= node.x)) {
                      if (node.L) node = node.L;
                      else { before = node.P; break; }
                    } else {
                      if (node.R) node = node.R;
                      else { before = node; break; }
                    }
                  }

                  circles.insert(before, circle);
                  if (!before) firstCircle = circle;
                }

                function detachCircle(arc) {
                  var circle = arc.circle;
                  if (circle) {
                    if (!circle.P) firstCircle = circle.N;
                    circles.remove(circle);
                    circlePool.push(circle);
                    RedBlackNode(circle);
                    arc.circle = null;
                  }
                }

                var beachPool = [];

                function Beach() {
                  RedBlackNode(this);
                  this.edge =
                  this.site =
                  this.circle = null;
                }

                function createBeach(site) {
                  var beach = beachPool.pop() || new Beach;
                  beach.site = site;
                  return beach;
                }

                function detachBeach(beach) {
                  detachCircle(beach);
                  beaches.remove(beach);
                  beachPool.push(beach);
                  RedBlackNode(beach);
                }

                function removeBeach(beach) {
                  var circle = beach.circle,
                      x = circle.x,
                      y = circle.cy,
                      vertex = [x, y],
                      previous = beach.P,
                      next = beach.N,
                      disappearing = [beach];

                  detachBeach(beach);

                  var lArc = previous;
                  while (lArc.circle
                      && Math.abs(x - lArc.circle.x) < epsilon$3
                      && Math.abs(y - lArc.circle.cy) < epsilon$3) {
                    previous = lArc.P;
                    disappearing.unshift(lArc);
                    detachBeach(lArc);
                    lArc = previous;
                  }

                  disappearing.unshift(lArc);
                  detachCircle(lArc);

                  var rArc = next;
                  while (rArc.circle
                      && Math.abs(x - rArc.circle.x) < epsilon$3
                      && Math.abs(y - rArc.circle.cy) < epsilon$3) {
                    next = rArc.N;
                    disappearing.push(rArc);
                    detachBeach(rArc);
                    rArc = next;
                  }

                  disappearing.push(rArc);
                  detachCircle(rArc);

                  var nArcs = disappearing.length,
                      iArc;
                  for (iArc = 1; iArc < nArcs; ++iArc) {
                    rArc = disappearing[iArc];
                    lArc = disappearing[iArc - 1];
                    setEdgeEnd(rArc.edge, lArc.site, rArc.site, vertex);
                  }

                  lArc = disappearing[0];
                  rArc = disappearing[nArcs - 1];
                  rArc.edge = createEdge(lArc.site, rArc.site, null, vertex);

                  attachCircle(lArc);
                  attachCircle(rArc);
                }

                function addBeach(site) {
                  var x = site[0],
                      directrix = site[1],
                      lArc,
                      rArc,
                      dxl,
                      dxr,
                      node = beaches._;

                  while (node) {
                    dxl = leftBreakPoint(node, directrix) - x;
                    if (dxl > epsilon$3) node = node.L; else {
                      dxr = x - rightBreakPoint(node, directrix);
                      if (dxr > epsilon$3) {
                        if (!node.R) {
                          lArc = node;
                          break;
                        }
                        node = node.R;
                      } else {
                        if (dxl > -epsilon$3) {
                          lArc = node.P;
                          rArc = node;
                        } else if (dxr > -epsilon$3) {
                          lArc = node;
                          rArc = node.N;
                        } else {
                          lArc = rArc = node;
                        }
                        break;
                      }
                    }
                  }

                  createCell(site);
                  var newArc = createBeach(site);
                  beaches.insert(lArc, newArc);

                  if (!lArc && !rArc) return;

                  if (lArc === rArc) {
                    detachCircle(lArc);
                    rArc = createBeach(lArc.site);
                    beaches.insert(newArc, rArc);
                    newArc.edge = rArc.edge = createEdge(lArc.site, newArc.site);
                    attachCircle(lArc);
                    attachCircle(rArc);
                    return;
                  }

                  if (!rArc) { // && lArc
                    newArc.edge = createEdge(lArc.site, newArc.site);
                    return;
                  }

                  // else lArc !== rArc
                  detachCircle(lArc);
                  detachCircle(rArc);

                  var lSite = lArc.site,
                      ax = lSite[0],
                      ay = lSite[1],
                      bx = site[0] - ax,
                      by = site[1] - ay,
                      rSite = rArc.site,
                      cx = rSite[0] - ax,
                      cy = rSite[1] - ay,
                      d = 2 * (bx * cy - by * cx),
                      hb = bx * bx + by * by,
                      hc = cx * cx + cy * cy,
                      vertex = [(cy * hb - by * hc) / d + ax, (bx * hc - cx * hb) / d + ay];

                  setEdgeEnd(rArc.edge, lSite, rSite, vertex);
                  newArc.edge = createEdge(lSite, site, null, vertex);
                  rArc.edge = createEdge(site, rSite, null, vertex);
                  attachCircle(lArc);
                  attachCircle(rArc);
                }

                function leftBreakPoint(arc, directrix) {
                  var site = arc.site,
                      rfocx = site[0],
                      rfocy = site[1],
                      pby2 = rfocy - directrix;

                  if (!pby2) return rfocx;

                  var lArc = arc.P;
                  if (!lArc) return -Infinity;

                  site = lArc.site;
                  var lfocx = site[0],
                      lfocy = site[1],
                      plby2 = lfocy - directrix;

                  if (!plby2) return lfocx;

                  var hl = lfocx - rfocx,
                      aby2 = 1 / pby2 - 1 / plby2,
                      b = hl / plby2;

                  if (aby2) return (-b + Math.sqrt(b * b - 2 * aby2 * (hl * hl / (-2 * plby2) - lfocy + plby2 / 2 + rfocy - pby2 / 2))) / aby2 + rfocx;

                  return (rfocx + lfocx) / 2;
                }

                function rightBreakPoint(arc, directrix) {
                  var rArc = arc.N;
                  if (rArc) return leftBreakPoint(rArc, directrix);
                  var site = arc.site;
                  return site[1] === directrix ? site[0] : Infinity;
                }

                var epsilon$3 = 1e-6;
                var epsilon2$1 = 1e-12;
                var beaches;
                var cells;
                var circles;
                var edges;

                function triangleArea(a, b, c) {
                  return (a[0] - c[0]) * (b[1] - a[1]) - (a[0] - b[0]) * (c[1] - a[1]);
                }

                function lexicographic(a, b) {
                  return b[1] - a[1]
                      || b[0] - a[0];
                }

                function Diagram(sites, extent) {
                  var site = sites.sort(lexicographic).pop(),
                      x,
                      y,
                      circle;

                  edges = [];
                  cells = new Array(sites.length);
                  beaches = new RedBlackTree;
                  circles = new RedBlackTree;

                  while (true) {
                    circle = firstCircle;
                    if (site && (!circle || site[1] < circle.y || (site[1] === circle.y && site[0] < circle.x))) {
                      if (site[0] !== x || site[1] !== y) {
                        addBeach(site);
                        x = site[0], y = site[1];
                      }
                      site = sites.pop();
                    } else if (circle) {
                      removeBeach(circle.arc);
                    } else {
                      break;
                    }
                  }

                  sortCellHalfedges();

                  if (extent) {
                    var x0 = +extent[0][0],
                        y0 = +extent[0][1],
                        x1 = +extent[1][0],
                        y1 = +extent[1][1];
                    clipEdges(x0, y0, x1, y1);
                    clipCells(x0, y0, x1, y1);
                  }

                  this.edges = edges;
                  this.cells = cells;

                  beaches =
                  circles =
                  edges =
                  cells = null;
                }

                Diagram.prototype = {
                  constructor: Diagram,

                  polygons: function() {
                    var edges = this.edges;

                    return this.cells.map(function(cell) {
                      var polygon = cell.halfedges.map(function(i) { return cellHalfedgeStart(cell, edges[i]); });
                      polygon.data = cell.site.data;
                      return polygon;
                    });
                  },

                  triangles: function() {
                    var triangles = [],
                        edges = this.edges;

                    this.cells.forEach(function(cell, i) {
                      var site = cell.site,
                          halfedges = cell.halfedges,
                          j = -1,
                          m = halfedges.length,
                          s0,
                          e1 = edges[halfedges[m - 1]],
                          s1 = e1.left === site ? e1.right : e1.left;

                      while (++j < m) {
                        s0 = s1;
                        e1 = edges[halfedges[j]];
                        s1 = e1.left === site ? e1.right : e1.left;
                        if (s0 && s1 && i < s0.index && i < s1.index && triangleArea(site, s0, s1) < 0) {
                          triangles.push([site.data, s0.data, s1.data]);
                        }
                      }
                    });

                    return triangles;
                  },

                  links: function() {
                    return this.edges.filter(function(edge) {
                      return edge.right;
                    }).map(function(edge) {
                      return {
                        source: edge.left.data,
                        target: edge.right.data
                      };
                    });
                  },

                  find: function(x, y, radius) {
                    var that = this,
                        i0, i1 = that._found || 0,
                        cell = that.cells[i1] || that.cells[i1 = 0],
                        dx = x - cell.site[0],
                        dy = y - cell.site[1],
                        d2 = dx * dx + dy * dy;

                    do {
                      cell = that.cells[i0 = i1], i1 = null;
                      cell.halfedges.forEach(function(e) {
                        var edge = that.edges[e], v = edge.left;
                        if ((v === cell.site || !v) && !(v = edge.right)) return;
                        var vx = x - v[0],
                            vy = y - v[1],
                            v2 = vx * vx + vy * vy;
                        if (v2 < d2) d2 = v2, i1 = v.index;
                      });
                    } while (i1 !== null);

                    that._found = i0;

                    return radius == null || d2 <= radius * radius ? cell.site : null;
                  }
                };

                var voronoi = function() {
                  var x$$1 = x$4,
                      y$$1 = y$4,
                      extent = null;

                  function voronoi(data) {
                    return new Diagram(data.map(function(d, i) {
                      var s = [Math.round(x$$1(d, i, data) / epsilon$3) * epsilon$3, Math.round(y$$1(d, i, data) / epsilon$3) * epsilon$3];
                      s.index = i;
                      s.data = d;
                      return s;
                    }), extent);
                  }

                  voronoi.polygons = function(data) {
                    return voronoi(data).polygons();
                  };

                  voronoi.links = function(data) {
                    return voronoi(data).links();
                  };

                  voronoi.triangles = function(data) {
                    return voronoi(data).triangles();
                  };

                  voronoi.x = function(_) {
                    return arguments.length ? (x$$1 = typeof _ === "function" ? _ : constant$9(+_), voronoi) : x$$1;
                  };

                  voronoi.y = function(_) {
                    return arguments.length ? (y$$1 = typeof _ === "function" ? _ : constant$9(+_), voronoi) : y$$1;
                  };

                  voronoi.extent = function(_) {
                    return arguments.length ? (extent = _ == null ? null : [[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]], voronoi) : extent && [[extent[0][0], extent[0][1]], [extent[1][0], extent[1][1]]];
                  };

                  voronoi.size = function(_) {
                    return arguments.length ? (extent = _ == null ? null : [[0, 0], [+_[0], +_[1]]], voronoi) : extent && [extent[1][0] - extent[0][0], extent[1][1] - extent[0][1]];
                  };

                  return voronoi;
                };

                var constant$10 = function(x) {
                  return function() {
                    return x;
                  };
                };

                function ZoomEvent(target, type, transform) {
                  this.target = target;
                  this.type = type;
                  this.transform = transform;
                }

                function Transform(k, x, y) {
                  this.k = k;
                  this.x = x;
                  this.y = y;
                }

                Transform.prototype = {
                  constructor: Transform,
                  scale: function(k) {
                    return k === 1 ? this : new Transform(this.k * k, this.x, this.y);
                  },
                  translate: function(x, y) {
                    return x === 0 & y === 0 ? this : new Transform(this.k, this.x + this.k * x, this.y + this.k * y);
                  },
                  apply: function(point) {
                    return [point[0] * this.k + this.x, point[1] * this.k + this.y];
                  },
                  applyX: function(x) {
                    return x * this.k + this.x;
                  },
                  applyY: function(y) {
                    return y * this.k + this.y;
                  },
                  invert: function(location) {
                    return [(location[0] - this.x) / this.k, (location[1] - this.y) / this.k];
                  },
                  invertX: function(x) {
                    return (x - this.x) / this.k;
                  },
                  invertY: function(y) {
                    return (y - this.y) / this.k;
                  },
                  rescaleX: function(x) {
                    return x.copy().domain(x.range().map(this.invertX, this).map(x.invert, x));
                  },
                  rescaleY: function(y) {
                    return y.copy().domain(y.range().map(this.invertY, this).map(y.invert, y));
                  },
                  toString: function() {
                    return "translate(" + this.x + "," + this.y + ") scale(" + this.k + ")";
                  }
                };

                var identity$6 = new Transform(1, 0, 0);

                transform.prototype = Transform.prototype;

                function transform(node) {
                  return node.__zoom || identity$6;
                }

                function nopropagation$1() {
                  exports.event.stopImmediatePropagation();
                }

                var noevent$1 = function() {
                  exports.event.preventDefault();
                  exports.event.stopImmediatePropagation();
                };

                // Ignore right-click, since that should open the context menu.
                function defaultFilter$1() {
                  return !exports.event.button;
                }

                function defaultExtent() {
                  var e = this, w, h;
                  if (e instanceof SVGElement) {
                    e = e.ownerSVGElement || e;
                    w = e.width.baseVal.value;
                    h = e.height.baseVal.value;
                  } else {
                    w = e.clientWidth;
                    h = e.clientHeight;
                  }
                  return [[0, 0], [w, h]];
                }

                function defaultTransform() {
                  return this.__zoom || identity$6;
                }

                var zoom = function() {
                  var filter = defaultFilter$1,
                      extent = defaultExtent,
                      k0 = 0,
                      k1 = Infinity,
                      x0 = -k1,
                      x1 = k1,
                      y0 = x0,
                      y1 = x1,
                      duration = 250,
                      gestures = [],
                      listeners = dispatch("start", "zoom", "end"),
                      touchstarting,
                      touchending,
                      touchDelay = 500,
                      wheelDelay = 150;

                  function zoom(selection$$1) {
                    selection$$1
                        .on("wheel.zoom", wheeled)
                        .on("mousedown.zoom", mousedowned)
                        .on("dblclick.zoom", dblclicked)
                        .on("touchstart.zoom", touchstarted)
                        .on("touchmove.zoom", touchmoved)
                        .on("touchend.zoom touchcancel.zoom", touchended)
                        .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)")
                        .property("__zoom", defaultTransform);
                  }

                  zoom.transform = function(collection, transform) {
                    var selection$$1 = collection.selection ? collection.selection() : collection;
                    selection$$1.property("__zoom", defaultTransform);
                    if (collection !== selection$$1) {
                      schedule(collection, transform);
                    } else {
                      selection$$1.interrupt().each(function() {
                        gesture(this, arguments)
                            .start()
                            .zoom(null, typeof transform === "function" ? transform.apply(this, arguments) : transform)
                            .end();
                      });
                    }
                  };

                  zoom.scaleBy = function(selection$$1, k) {
                    zoom.scaleTo(selection$$1, function() {
                      var k0 = this.__zoom.k,
                          k1 = typeof k === "function" ? k.apply(this, arguments) : k;
                      return k0 * k1;
                    });
                  };

                  zoom.scaleTo = function(selection$$1, k) {
                    zoom.transform(selection$$1, function() {
                      var e = extent.apply(this, arguments),
                          t0 = this.__zoom,
                          p0 = centroid(e),
                          p1 = t0.invert(p0),
                          k1 = typeof k === "function" ? k.apply(this, arguments) : k;
                      return constrain(translate(scale(t0, k1), p0, p1), e);
                    });
                  };

                  zoom.translateBy = function(selection$$1, x, y) {
                    zoom.transform(selection$$1, function() {
                      return constrain(this.__zoom.translate(
                        typeof x === "function" ? x.apply(this, arguments) : x,
                        typeof y === "function" ? y.apply(this, arguments) : y
                      ), extent.apply(this, arguments));
                    });
                  };

                  function scale(transform, k) {
                    k = Math.max(k0, Math.min(k1, k));
                    return k === transform.k ? transform : new Transform(k, transform.x, transform.y);
                  }

                  function translate(transform, p0, p1) {
                    var x = p0[0] - p1[0] * transform.k, y = p0[1] - p1[1] * transform.k;
                    return x === transform.x && y === transform.y ? transform : new Transform(transform.k, x, y);
                  }

                  function constrain(transform, extent) {
                    var dx = Math.min(0, transform.invertX(extent[0][0]) - x0) || Math.max(0, transform.invertX(extent[1][0]) - x1),
                        dy = Math.min(0, transform.invertY(extent[0][1]) - y0) || Math.max(0, transform.invertY(extent[1][1]) - y1);
                    return dx || dy ? transform.translate(dx, dy) : transform;
                  }

                  function centroid(extent) {
                    return [(+extent[0][0] + +extent[1][0]) / 2, (+extent[0][1] + +extent[1][1]) / 2];
                  }

                  function schedule(transition$$1, transform, center) {
                    transition$$1
                        .on("start.zoom", function() { gesture(this, arguments).start(); })
                        .on("interrupt.zoom end.zoom", function() { gesture(this, arguments).end(); })
                        .tween("zoom", function() {
                          var that = this,
                              args = arguments,
                              g = gesture(that, args),
                              e = extent.apply(that, args),
                              p = center || centroid(e),
                              w = Math.max(e[1][0] - e[0][0], e[1][1] - e[0][1]),
                              a = that.__zoom,
                              b = typeof transform === "function" ? transform.apply(that, args) : transform,
                              i = interpolateZoom(a.invert(p).concat(w / a.k), b.invert(p).concat(w / b.k));
                          return function(t) {
                            if (t === 1) t = b; // Avoid rounding error on end.
                            else { var l = i(t), k = w / l[2]; t = new Transform(k, p[0] - l[0] * k, p[1] - l[1] * k); }
                            g.zoom(null, t);
                          };
                        });
                  }

                  function gesture(that, args) {
                    for (var i = 0, n = gestures.length, g; i < n; ++i) {
                      if ((g = gestures[i]).that === that) {
                        return g;
                      }
                    }
                    return new Gesture(that, args);
                  }

                  function Gesture(that, args) {
                    this.that = that;
                    this.args = args;
                    this.index = -1;
                    this.active = 0;
                    this.extent = extent.apply(that, args);
                  }

                  Gesture.prototype = {
                    start: function() {
                      if (++this.active === 1) {
                        this.index = gestures.push(this) - 1;
                        this.emit("start");
                      }
                      return this;
                    },
                    zoom: function(key, transform) {
                      if (this.mouse && key !== "mouse") this.mouse[1] = transform.invert(this.mouse[0]);
                      if (this.touch0 && key !== "touch") this.touch0[1] = transform.invert(this.touch0[0]);
                      if (this.touch1 && key !== "touch") this.touch1[1] = transform.invert(this.touch1[0]);
                      this.that.__zoom = transform;
                      this.emit("zoom");
                      return this;
                    },
                    end: function() {
                      if (--this.active === 0) {
                        gestures.splice(this.index, 1);
                        this.index = -1;
                        this.emit("end");
                      }
                      return this;
                    },
                    emit: function(type) {
                      customEvent(new ZoomEvent(zoom, type, this.that.__zoom), listeners.apply, listeners, [type, this.that, this.args]);
                    }
                  };

                  function wheeled() {
                    if (!filter.apply(this, arguments)) return;
                    var g = gesture(this, arguments),
                        t = this.__zoom,
                        k = Math.max(k0, Math.min(k1, t.k * Math.pow(2, -exports.event.deltaY * (exports.event.deltaMode ? 120 : 1) / 500))),
                        p = mouse(this);

                    // If the mouse is in the same location as before, reuse it.
                    // If there were recent wheel events, reset the wheel idle timeout.
                    if (g.wheel) {
                      if (g.mouse[0][0] !== p[0] || g.mouse[0][1] !== p[1]) {
                        g.mouse[1] = t.invert(g.mouse[0] = p);
                      }
                      clearTimeout(g.wheel);
                    }

                    // If this wheel event won’t trigger a transform change, ignore it.
                    else if (t.k === k) return;

                    // Otherwise, capture the mouse point and location at the start.
                    else {
                      g.mouse = [p, t.invert(p)];
                      interrupt(this);
                      g.start();
                    }

                    noevent$1();
                    g.wheel = setTimeout(wheelidled, wheelDelay);
                    g.zoom("mouse", constrain(translate(scale(t, k), g.mouse[0], g.mouse[1]), g.extent));

                    function wheelidled() {
                      g.wheel = null;
                      g.end();
                    }
                  }

                  function mousedowned() {
                    if (touchending || !filter.apply(this, arguments)) return;
                    var g = gesture(this, arguments),
                        v = select(exports.event.view).on("mousemove.zoom", mousemoved, true).on("mouseup.zoom", mouseupped, true),
                        p = mouse(this);

                    dragDisable(exports.event.view);
                    nopropagation$1();
                    g.mouse = [p, this.__zoom.invert(p)];
                    interrupt(this);
                    g.start();

                    function mousemoved() {
                      noevent$1();
                      g.moved = true;
                      g.zoom("mouse", constrain(translate(g.that.__zoom, g.mouse[0] = mouse(g.that), g.mouse[1]), g.extent));
                    }

                    function mouseupped() {
                      v.on("mousemove.zoom mouseup.zoom", null);
                      yesdrag(exports.event.view, g.moved);
                      noevent$1();
                      g.end();
                    }
                  }

                  function dblclicked() {
                    if (!filter.apply(this, arguments)) return;
                    var t0 = this.__zoom,
                        p0 = mouse(this),
                        p1 = t0.invert(p0),
                        k1 = t0.k * (exports.event.shiftKey ? 0.5 : 2),
                        t1 = constrain(translate(scale(t0, k1), p0, p1), extent.apply(this, arguments));

                    noevent$1();
                    if (duration > 0) select(this).transition().duration(duration).call(schedule, t1, p0);
                    else select(this).call(zoom.transform, t1);
                  }

                  function touchstarted() {
                    if (!filter.apply(this, arguments)) return;
                    var g = gesture(this, arguments),
                        touches$$1 = exports.event.changedTouches,
                        n = touches$$1.length, i, t, p;

                    nopropagation$1();
                    for (i = 0; i < n; ++i) {
                      t = touches$$1[i], p = touch(this, touches$$1, t.identifier);
                      p = [p, this.__zoom.invert(p), t.identifier];
                      if (!g.touch0) g.touch0 = p;
                      else if (!g.touch1) g.touch1 = p;
                    }
                    if (touchstarting) {
                      touchstarting = clearTimeout(touchstarting);
                      if (!g.touch1) return g.end(), dblclicked.apply(this, arguments);
                    }
                    if (exports.event.touches.length === n) {
                      touchstarting = setTimeout(function() { touchstarting = null; }, touchDelay);
                      interrupt(this);
                      g.start();
                    }
                  }

                  function touchmoved() {
                    var g = gesture(this, arguments),
                        touches$$1 = exports.event.changedTouches,
                        n = touches$$1.length, i, t, p, l;

                    noevent$1();
                    if (touchstarting) touchstarting = clearTimeout(touchstarting);
                    for (i = 0; i < n; ++i) {
                      t = touches$$1[i], p = touch(this, touches$$1, t.identifier);
                      if (g.touch0 && g.touch0[2] === t.identifier) g.touch0[0] = p;
                      else if (g.touch1 && g.touch1[2] === t.identifier) g.touch1[0] = p;
                    }
                    t = g.that.__zoom;
                    if (g.touch1) {
                      var p0 = g.touch0[0], l0 = g.touch0[1],
                          p1 = g.touch1[0], l1 = g.touch1[1],
                          dp = (dp = p1[0] - p0[0]) * dp + (dp = p1[1] - p0[1]) * dp,
                          dl = (dl = l1[0] - l0[0]) * dl + (dl = l1[1] - l0[1]) * dl;
                      t = scale(t, Math.sqrt(dp / dl));
                      p = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2];
                      l = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2];
                    }
                    else if (g.touch0) p = g.touch0[0], l = g.touch0[1];
                    else return;
                    g.zoom("touch", constrain(translate(t, p, l), g.extent));
                  }

                  function touchended() {
                    var g = gesture(this, arguments),
                        touches$$1 = exports.event.changedTouches,
                        n = touches$$1.length, i, t;

                    nopropagation$1();
                    if (touchending) clearTimeout(touchending);
                    touchending = setTimeout(function() { touchending = null; }, touchDelay);
                    for (i = 0; i < n; ++i) {
                      t = touches$$1[i];
                      if (g.touch0 && g.touch0[2] === t.identifier) delete g.touch0;
                      else if (g.touch1 && g.touch1[2] === t.identifier) delete g.touch1;
                    }
                    if (g.touch1 && !g.touch0) g.touch0 = g.touch1, delete g.touch1;
                    if (!g.touch0) g.end();
                  }

                  zoom.filter = function(_) {
                    return arguments.length ? (filter = typeof _ === "function" ? _ : constant$10(!!_), zoom) : filter;
                  };

                  zoom.extent = function(_) {
                    return arguments.length ? (extent = typeof _ === "function" ? _ : constant$10([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), zoom) : extent;
                  };

                  zoom.scaleExtent = function(_) {
                    return arguments.length ? (k0 = +_[0], k1 = +_[1], zoom) : [k0, k1];
                  };

                  zoom.translateExtent = function(_) {
                    return arguments.length ? (x0 = +_[0][0], x1 = +_[1][0], y0 = +_[0][1], y1 = +_[1][1], zoom) : [[x0, y0], [x1, y1]];
                  };

                  zoom.duration = function(_) {
                    return arguments.length ? (duration = +_, zoom) : duration;
                  };

                  zoom.on = function() {
                    var value = listeners.on.apply(listeners, arguments);
                    return value === listeners ? zoom : value;
                  };

                  return zoom;
                };

                var constant$11 = function(x) {
                  return function() {
                    return x;
                  };
                };

                var BrushEvent = function(target, type, selection) {
                  this.target = target;
                  this.type = type;
                  this.selection = selection;
                };

                function nopropagation$2() {
                  exports.event.stopImmediatePropagation();
                }

                var noevent$2 = function() {
                  exports.event.preventDefault();
                  exports.event.stopImmediatePropagation();
                };

                var MODE_DRAG = {name: "drag"};
                var MODE_SPACE = {name: "space"};
                var MODE_HANDLE = {name: "handle"};
                var MODE_CENTER = {name: "center"};

                var X = {
                  name: "x",
                  handles: ["e", "w"].map(type$1),
                  input: function(x, e) { return x && [[x[0], e[0][1]], [x[1], e[1][1]]]; },
                  output: function(xy) { return xy && [xy[0][0], xy[1][0]]; }
                };

                var Y = {
                  name: "y",
                  handles: ["n", "s"].map(type$1),
                  input: function(y, e) { return y && [[e[0][0], y[0]], [e[1][0], y[1]]]; },
                  output: function(xy) { return xy && [xy[0][1], xy[1][1]]; }
                };

                var XY = {
                  name: "xy",
                  handles: ["n", "e", "s", "w", "nw", "ne", "se", "sw"].map(type$1),
                  input: function(xy) { return xy; },
                  output: function(xy) { return xy; }
                };

                var cursors = {
                  overlay: "crosshair",
                  selection: "move",
                  n: "ns-resize",
                  e: "ew-resize",
                  s: "ns-resize",
                  w: "ew-resize",
                  nw: "nwse-resize",
                  ne: "nesw-resize",
                  se: "nwse-resize",
                  sw: "nesw-resize"
                };

                var flipX = {
                  e: "w",
                  w: "e",
                  nw: "ne",
                  ne: "nw",
                  se: "sw",
                  sw: "se"
                };

                var flipY = {
                  n: "s",
                  s: "n",
                  nw: "sw",
                  ne: "se",
                  se: "ne",
                  sw: "nw"
                };

                var signsX = {
                  overlay: +1,
                  selection: +1,
                  n: null,
                  e: +1,
                  s: null,
                  w: -1,
                  nw: -1,
                  ne: +1,
                  se: +1,
                  sw: -1
                };

                var signsY = {
                  overlay: +1,
                  selection: +1,
                  n: -1,
                  e: null,
                  s: +1,
                  w: null,
                  nw: -1,
                  ne: -1,
                  se: +1,
                  sw: +1
                };

                function type$1(t) {
                  return {type: t};
                }

                // Ignore right-click, since that should open the context menu.
                function defaultFilter$2() {
                  return !exports.event.button;
                }

                function defaultExtent$1() {
                  var svg = this.ownerSVGElement || this;
                  return [[0, 0], [svg.width.baseVal.value, svg.height.baseVal.value]];
                }

                // Like d3.local, but with the name “__brush” rather than auto-generated.
                function local$1(node) {
                  while (!node.__brush) if (!(node = node.parentNode)) return;
                  return node.__brush;
                }

                function empty$1(extent) {
                  return extent[0][0] === extent[1][0]
                      || extent[0][1] === extent[1][1];
                }

                function brushSelection(node) {
                  var state = node.__brush;
                  return state ? state.dim.output(state.selection) : null;
                }

                function brushX() {
                  return brush$1(X);
                }

                function brushY() {
                  return brush$1(Y);
                }

                var brush = function() {
                  return brush$1(XY);
                };

                function brush$1(dim) {
                  var extent = defaultExtent$1,
                      filter = defaultFilter$2,
                      listeners = dispatch(brush, "start", "brush", "end"),
                      handleSize = 6,
                      touchending;

                  function brush(group) {
                    var overlay = group
                        .property("__brush", initialize)
                      .selectAll(".overlay")
                      .data([type$1("overlay")]);

                    overlay.enter().append("rect")
                        .attr("class", "overlay")
                        .attr("pointer-events", "all")
                        .attr("cursor", cursors.overlay)
                      .merge(overlay)
                        .each(function() {
                          var extent = local$1(this).extent;
                          select(this)
                              .attr("x", extent[0][0])
                              .attr("y", extent[0][1])
                              .attr("width", extent[1][0] - extent[0][0])
                              .attr("height", extent[1][1] - extent[0][1]);
                        });

                    group.selectAll(".selection")
                      .data([type$1("selection")])
                      .enter().append("rect")
                        .attr("class", "selection")
                        .attr("cursor", cursors.selection)
                        .attr("fill", "#777")
                        .attr("fill-opacity", 0.3)
                        .attr("stroke", "#fff")
                        .attr("shape-rendering", "crispEdges");

                    var handle = group.selectAll(".handle")
                      .data(dim.handles, function(d) { return d.type; });

                    handle.exit().remove();

                    handle.enter().append("rect")
                        .attr("class", function(d) { return "handle handle--" + d.type; })
                        .attr("cursor", function(d) { return cursors[d.type]; });

                    group
                        .each(redraw)
                        .attr("fill", "none")
                        .attr("pointer-events", "all")
                        .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)")
                        .on("mousedown.brush touchstart.brush", started);
                  }

                  brush.move = function(group, selection$$1) {
                    if (group.selection) {
                      group
                          .on("start.brush", function() { emitter(this, arguments).beforestart().start(); })
                          .on("interrupt.brush end.brush", function() { emitter(this, arguments).end(); })
                          .tween("brush", function() {
                            var that = this,
                                state = that.__brush,
                                emit = emitter(that, arguments),
                                selection0 = state.selection,
                                selection1 = dim.input(typeof selection$$1 === "function" ? selection$$1.apply(this, arguments) : selection$$1, state.extent),
                                i = interpolate(selection0, selection1);

                            function tween(t) {
                              state.selection = t === 1 && empty$1(selection1) ? null : i(t);
                              redraw.call(that);
                              emit.brush();
                            }

                            return selection0 && selection1 ? tween : tween(1);
                          });
                    } else {
                      group
                          .each(function() {
                            var that = this,
                                args = arguments,
                                state = that.__brush,
                                selection1 = dim.input(typeof selection$$1 === "function" ? selection$$1.apply(that, args) : selection$$1, state.extent),
                                emit = emitter(that, args).beforestart();

                            interrupt(that);
                            state.selection = selection1 == null || empty$1(selection1) ? null : selection1;
                            redraw.call(that);
                            emit.start().brush().end();
                          });
                    }
                  };

                  function redraw() {
                    var group = select(this),
                        selection$$1 = local$1(this).selection;

                    if (selection$$1) {
                      group.selectAll(".selection")
                          .style("display", null)
                          .attr("x", selection$$1[0][0])
                          .attr("y", selection$$1[0][1])
                          .attr("width", selection$$1[1][0] - selection$$1[0][0])
                          .attr("height", selection$$1[1][1] - selection$$1[0][1]);

                      group.selectAll(".handle")
                          .style("display", null)
                          .attr("x", function(d) { return d.type[d.type.length - 1] === "e" ? selection$$1[1][0] - handleSize / 2 : selection$$1[0][0] - handleSize / 2; })
                          .attr("y", function(d) { return d.type[0] === "s" ? selection$$1[1][1] - handleSize / 2 : selection$$1[0][1] - handleSize / 2; })
                          .attr("width", function(d) { return d.type === "n" || d.type === "s" ? selection$$1[1][0] - selection$$1[0][0] + handleSize : handleSize; })
                          .attr("height", function(d) { return d.type === "e" || d.type === "w" ? selection$$1[1][1] - selection$$1[0][1] + handleSize : handleSize; });
                    }

                    else {
                      group.selectAll(".selection,.handle")
                          .style("display", "none")
                          .attr("x", null)
                          .attr("y", null)
                          .attr("width", null)
                          .attr("height", null);
                    }
                  }

                  function emitter(that, args) {
                    return that.__brush.emitter || new Emitter(that, args);
                  }

                  function Emitter(that, args) {
                    this.that = that;
                    this.args = args;
                    this.state = that.__brush;
                    this.active = 0;
                  }

                  Emitter.prototype = {
                    beforestart: function() {
                      if (++this.active === 1) this.state.emitter = this, this.starting = true;
                      return this;
                    },
                    start: function() {
                      if (this.starting) this.starting = false, this.emit("start");
                      return this;
                    },
                    brush: function() {
                      this.emit("brush");
                      return this;
                    },
                    end: function() {
                      if (--this.active === 0) delete this.state.emitter, this.emit("end");
                      return this;
                    },
                    emit: function(type) {
                      customEvent(new BrushEvent(brush, type, dim.output(this.state.selection)), listeners.apply, listeners, [type, this.that, this.args]);
                    }
                  };

                  function started() {
                    if (exports.event.touches) { if (exports.event.changedTouches.length < exports.event.touches.length) return noevent$2(); }
                    else if (touchending) return;
                    if (!filter.apply(this, arguments)) return;

                    var that = this,
                        type = exports.event.target.__data__.type,
                        mode = (exports.event.metaKey ? type = "overlay" : type) === "selection" ? MODE_DRAG : (exports.event.altKey ? MODE_CENTER : MODE_HANDLE),
                        signX = dim === Y ? null : signsX[type],
                        signY = dim === X ? null : signsY[type],
                        state = local$1(that),
                        extent = state.extent,
                        selection$$1 = state.selection,
                        W = extent[0][0], w0, w1,
                        N = extent[0][1], n0, n1,
                        E = extent[1][0], e0, e1,
                        S = extent[1][1], s0, s1,
                        dx,
                        dy,
                        moving,
                        shifting = signX && signY && exports.event.shiftKey,
                        lockX,
                        lockY,
                        point0 = mouse(that),
                        point = point0,
                        emit = emitter(that, arguments).beforestart();

                    if (type === "overlay") {
                      state.selection = selection$$1 = [
                        [w0 = dim === Y ? W : point0[0], n0 = dim === X ? N : point0[1]],
                        [e0 = dim === Y ? E : w0, s0 = dim === X ? S : n0]
                      ];
                    } else {
                      w0 = selection$$1[0][0];
                      n0 = selection$$1[0][1];
                      e0 = selection$$1[1][0];
                      s0 = selection$$1[1][1];
                    }

                    w1 = w0;
                    n1 = n0;
                    e1 = e0;
                    s1 = s0;

                    var group = select(that)
                        .attr("pointer-events", "none");

                    var overlay = group.selectAll(".overlay")
                        .attr("cursor", cursors[type]);

                    if (exports.event.touches) {
                      group
                          .on("touchmove.brush", moved, true)
                          .on("touchend.brush touchcancel.brush", ended, true);
                    } else {
                      var view = select(exports.event.view)
                          .on("keydown.brush", keydowned, true)
                          .on("keyup.brush", keyupped, true)
                          .on("mousemove.brush", moved, true)
                          .on("mouseup.brush", ended, true);

                      dragDisable(exports.event.view);
                    }

                    nopropagation$2();
                    interrupt(that);
                    redraw.call(that);
                    emit.start();

                    function moved() {
                      var point1 = mouse(that);
                      if (shifting && !lockX && !lockY) {
                        if (Math.abs(point1[0] - point[0]) > Math.abs(point1[1] - point[1])) lockY = true;
                        else lockX = true;
                      }
                      point = point1;
                      moving = true;
                      noevent$2();
                      move();
                    }

                    function move() {
                      var t;

                      dx = point[0] - point0[0];
                      dy = point[1] - point0[1];

                      switch (mode) {
                        case MODE_SPACE:
                        case MODE_DRAG: {
                          if (signX) dx = Math.max(W - w0, Math.min(E - e0, dx)), w1 = w0 + dx, e1 = e0 + dx;
                          if (signY) dy = Math.max(N - n0, Math.min(S - s0, dy)), n1 = n0 + dy, s1 = s0 + dy;
                          break;
                        }
                        case MODE_HANDLE: {
                          if (signX < 0) dx = Math.max(W - w0, Math.min(E - w0, dx)), w1 = w0 + dx, e1 = e0;
                          else if (signX > 0) dx = Math.max(W - e0, Math.min(E - e0, dx)), w1 = w0, e1 = e0 + dx;
                          if (signY < 0) dy = Math.max(N - n0, Math.min(S - n0, dy)), n1 = n0 + dy, s1 = s0;
                          else if (signY > 0) dy = Math.max(N - s0, Math.min(S - s0, dy)), n1 = n0, s1 = s0 + dy;
                          break;
                        }
                        case MODE_CENTER: {
                          if (signX) w1 = Math.max(W, Math.min(E, w0 - dx * signX)), e1 = Math.max(W, Math.min(E, e0 + dx * signX));
                          if (signY) n1 = Math.max(N, Math.min(S, n0 - dy * signY)), s1 = Math.max(N, Math.min(S, s0 + dy * signY));
                          break;
                        }
                      }

                      if (e1 < w1) {
                        signX *= -1;
                        t = w0, w0 = e0, e0 = t;
                        t = w1, w1 = e1, e1 = t;
                        if (type in flipX) overlay.attr("cursor", cursors[type = flipX[type]]);
                      }

                      if (s1 < n1) {
                        signY *= -1;
                        t = n0, n0 = s0, s0 = t;
                        t = n1, n1 = s1, s1 = t;
                        if (type in flipY) overlay.attr("cursor", cursors[type = flipY[type]]);
                      }

                      if (state.selection) selection$$1 = state.selection; // May be set by brush.move!
                      if (lockX) w1 = selection$$1[0][0], e1 = selection$$1[1][0];
                      if (lockY) n1 = selection$$1[0][1], s1 = selection$$1[1][1];

                      if (selection$$1[0][0] !== w1
                          || selection$$1[0][1] !== n1
                          || selection$$1[1][0] !== e1
                          || selection$$1[1][1] !== s1) {
                        state.selection = [[w1, n1], [e1, s1]];
                        redraw.call(that);
                        emit.brush();
                      }
                    }

                    function ended() {
                      nopropagation$2();
                      if (exports.event.touches) {
                        if (exports.event.touches.length) return;
                        if (touchending) clearTimeout(touchending);
                        touchending = setTimeout(function() { touchending = null; }, 500); // Ghost clicks are delayed!
                        group.on("touchmove.brush touchend.brush touchcancel.brush", null);
                      } else {
                        yesdrag(exports.event.view, moving);
                        view.on("keydown.brush keyup.brush mousemove.brush mouseup.brush", null);
                      }
                      group.attr("pointer-events", "all");
                      overlay.attr("cursor", cursors.overlay);
                      if (state.selection) selection$$1 = state.selection; // May be set by brush.move (on start)!
                      if (empty$1(selection$$1)) state.selection = null, redraw.call(that);
                      emit.end();
                    }

                    function keydowned() {
                      switch (exports.event.keyCode) {
                        case 16: { // SHIFT
                          shifting = signX && signY;
                          break;
                        }
                        case 18: { // ALT
                          if (mode === MODE_HANDLE) {
                            if (signX) e0 = e1 - dx * signX, w0 = w1 + dx * signX;
                            if (signY) s0 = s1 - dy * signY, n0 = n1 + dy * signY;
                            mode = MODE_CENTER;
                            move();
                          }
                          break;
                        }
                        case 32: { // SPACE; takes priority over ALT
                          if (mode === MODE_HANDLE || mode === MODE_CENTER) {
                            if (signX < 0) e0 = e1 - dx; else if (signX > 0) w0 = w1 - dx;
                            if (signY < 0) s0 = s1 - dy; else if (signY > 0) n0 = n1 - dy;
                            mode = MODE_SPACE;
                            overlay.attr("cursor", cursors.selection);
                            move();
                          }
                          break;
                        }
                        default: return;
                      }
                      noevent$2();
                    }

                    function keyupped() {
                      switch (exports.event.keyCode) {
                        case 16: { // SHIFT
                          if (shifting) {
                            lockX = lockY = shifting = false;
                            move();
                          }
                          break;
                        }
                        case 18: { // ALT
                          if (mode === MODE_CENTER) {
                            if (signX < 0) e0 = e1; else if (signX > 0) w0 = w1;
                            if (signY < 0) s0 = s1; else if (signY > 0) n0 = n1;
                            mode = MODE_HANDLE;
                            move();
                          }
                          break;
                        }
                        case 32: { // SPACE
                          if (mode === MODE_SPACE) {
                            if (exports.event.altKey) {
                              if (signX) e0 = e1 - dx * signX, w0 = w1 + dx * signX;
                              if (signY) s0 = s1 - dy * signY, n0 = n1 + dy * signY;
                              mode = MODE_CENTER;
                            } else {
                              if (signX < 0) e0 = e1; else if (signX > 0) w0 = w1;
                              if (signY < 0) s0 = s1; else if (signY > 0) n0 = n1;
                              mode = MODE_HANDLE;
                            }
                            overlay.attr("cursor", cursors[type]);
                            move();
                          }
                          break;
                        }
                        default: return;
                      }
                      noevent$2();
                    }
                  }

                  function initialize() {
                    var state = this.__brush || {selection: null};
                    state.extent = extent.apply(this, arguments);
                    state.dim = dim;
                    return state;
                  }

                  brush.extent = function(_) {
                    return arguments.length ? (extent = typeof _ === "function" ? _ : constant$11([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), brush) : extent;
                  };

                  brush.filter = function(_) {
                    return arguments.length ? (filter = typeof _ === "function" ? _ : constant$11(!!_), brush) : filter;
                  };

                  brush.handleSize = function(_) {
                    return arguments.length ? (handleSize = +_, brush) : handleSize;
                  };

                  brush.on = function() {
                    var value = listeners.on.apply(listeners, arguments);
                    return value === listeners ? brush : value;
                  };

                  return brush;
                }

                var cos = Math.cos;
                var sin = Math.sin;
                var pi$3 = Math.PI;
                var halfPi$2 = pi$3 / 2;
                var tau$3 = pi$3 * 2;
                var max$1 = Math.max;

                function compareValue(compare) {
                  return function(a, b) {
                    return compare(
                      a.source.value + a.target.value,
                      b.source.value + b.target.value
                    );
                  };
                }

                var chord = function() {
                  var padAngle = 0,
                      sortGroups = null,
                      sortSubgroups = null,
                      sortChords = null;

                  function chord(matrix) {
                    var n = matrix.length,
                        groupSums = [],
                        groupIndex = range(n),
                        subgroupIndex = [],
                        chords = [],
                        groups = chords.groups = new Array(n),
                        subgroups = new Array(n * n),
                        k,
                        x,
                        x0,
                        dx,
                        i,
                        j;

                    // Compute the sum.
                    k = 0, i = -1; while (++i < n) {
                      x = 0, j = -1; while (++j < n) {
                        x += matrix[i][j];
                      }
                      groupSums.push(x);
                      subgroupIndex.push(range(n));
                      k += x;
                    }

                    // Sort groups…
                    if (sortGroups) groupIndex.sort(function(a, b) {
                      return sortGroups(groupSums[a], groupSums[b]);
                    });

                    // Sort subgroups…
                    if (sortSubgroups) subgroupIndex.forEach(function(d, i) {
                      d.sort(function(a, b) {
                        return sortSubgroups(matrix[i][a], matrix[i][b]);
                      });
                    });

                    // Convert the sum to scaling factor for [0, 2pi].
                    // TODO Allow start and end angle to be specified?
                    // TODO Allow padding to be specified as percentage?
                    k = max$1(0, tau$3 - padAngle * n) / k;
                    dx = k ? padAngle : tau$3 / n;

                    // Compute the start and end angle for each group and subgroup.
                    // Note: Opera has a bug reordering object literal properties!
                    x = 0, i = -1; while (++i < n) {
                      x0 = x, j = -1; while (++j < n) {
                        var di = groupIndex[i],
                            dj = subgroupIndex[di][j],
                            v = matrix[di][dj],
                            a0 = x,
                            a1 = x += v * k;
                        subgroups[dj * n + di] = {
                          index: di,
                          subindex: dj,
                          startAngle: a0,
                          endAngle: a1,
                          value: v
                        };
                      }
                      groups[di] = {
                        index: di,
                        startAngle: x0,
                        endAngle: x,
                        value: groupSums[di]
                      };
                      x += dx;
                    }

                    // Generate chords for each (non-empty) subgroup-subgroup link.
                    i = -1; while (++i < n) {
                      j = i - 1; while (++j < n) {
                        var source = subgroups[j * n + i],
                            target = subgroups[i * n + j];
                        if (source.value || target.value) {
                          chords.push(source.value < target.value
                              ? {source: target, target: source}
                              : {source: source, target: target});
                        }
                      }
                    }

                    return sortChords ? chords.sort(sortChords) : chords;
                  }

                  chord.padAngle = function(_) {
                    return arguments.length ? (padAngle = max$1(0, _), chord) : padAngle;
                  };

                  chord.sortGroups = function(_) {
                    return arguments.length ? (sortGroups = _, chord) : sortGroups;
                  };

                  chord.sortSubgroups = function(_) {
                    return arguments.length ? (sortSubgroups = _, chord) : sortSubgroups;
                  };

                  chord.sortChords = function(_) {
                    return arguments.length ? (_ == null ? sortChords = null : (sortChords = compareValue(_))._ = _, chord) : sortChords && sortChords._;
                  };

                  return chord;
                };

                var slice$5 = Array.prototype.slice;

                var constant$12 = function(x) {
                  return function() {
                    return x;
                  };
                };

                function defaultSource(d) {
                  return d.source;
                }

                function defaultTarget(d) {
                  return d.target;
                }

                function defaultRadius$1(d) {
                  return d.radius;
                }

                function defaultStartAngle(d) {
                  return d.startAngle;
                }

                function defaultEndAngle(d) {
                  return d.endAngle;
                }

                var ribbon = function() {
                  var source = defaultSource,
                      target = defaultTarget,
                      radius = defaultRadius$1,
                      startAngle = defaultStartAngle,
                      endAngle = defaultEndAngle,
                      context = null;

                  function ribbon() {
                    var buffer,
                        argv = slice$5.call(arguments),
                        s = source.apply(this, argv),
                        t = target.apply(this, argv),
                        sr = +radius.apply(this, (argv[0] = s, argv)),
                        sa0 = startAngle.apply(this, argv) - halfPi$2,
                        sa1 = endAngle.apply(this, argv) - halfPi$2,
                        sx0 = sr * cos(sa0),
                        sy0 = sr * sin(sa0),
                        tr = +radius.apply(this, (argv[0] = t, argv)),
                        ta0 = startAngle.apply(this, argv) - halfPi$2,
                        ta1 = endAngle.apply(this, argv) - halfPi$2;

                    if (!context) context = buffer = path();

                    context.moveTo(sx0, sy0);
                    context.arc(0, 0, sr, sa0, sa1);
                    if (sa0 !== ta0 || sa1 !== ta1) { // TODO sr !== tr?
                      context.quadraticCurveTo(0, 0, tr * cos(ta0), tr * sin(ta0));
                      context.arc(0, 0, tr, ta0, ta1);
                    }
                    context.quadraticCurveTo(0, 0, sx0, sy0);
                    context.closePath();

                    if (buffer) return context = null, buffer + "" || null;
                  }

                  ribbon.radius = function(_) {
                    return arguments.length ? (radius = typeof _ === "function" ? _ : constant$12(+_), ribbon) : radius;
                  };

                  ribbon.startAngle = function(_) {
                    return arguments.length ? (startAngle = typeof _ === "function" ? _ : constant$12(+_), ribbon) : startAngle;
                  };

                  ribbon.endAngle = function(_) {
                    return arguments.length ? (endAngle = typeof _ === "function" ? _ : constant$12(+_), ribbon) : endAngle;
                  };

                  ribbon.source = function(_) {
                    return arguments.length ? (source = _, ribbon) : source;
                  };

                  ribbon.target = function(_) {
                    return arguments.length ? (target = _, ribbon) : target;
                  };

                  ribbon.context = function(_) {
                    return arguments.length ? ((context = _ == null ? null : _), ribbon) : context;
                  };

                  return ribbon;
                };

                // Adds floating point numbers with twice the normal precision.
                // Reference: J. R. Shewchuk, Adaptive Precision Floating-Point Arithmetic and
                // Fast Robust Geometric Predicates, Discrete & Computational Geometry 18(3)
                // 305–363 (1997).
                // Code adapted from GeographicLib by Charles F. F. Karney,
                // http://geographiclib.sourceforge.net/

                var adder = function() {
                  return new Adder;
                };

                function Adder() {
                  this.reset();
                }

                Adder.prototype = {
                  constructor: Adder,
                  reset: function() {
                    this.s = // rounded value
                    this.t = 0; // exact error
                  },
                  add: function(y) {
                    add$1(temp, y, this.t);
                    add$1(this, temp.s, this.s);
                    if (this.s) this.t += temp.t;
                    else this.s = temp.t;
                  },
                  valueOf: function() {
                    return this.s;
                  }
                };

                var temp = new Adder;

                function add$1(adder, a, b) {
                  var x = adder.s = a + b,
                      bv = x - a,
                      av = x - bv;
                  adder.t = (a - av) + (b - bv);
                }

                var epsilon$4 = 1e-6;
                var epsilon2$2 = 1e-12;
                var pi$4 = Math.PI;
                var halfPi$3 = pi$4 / 2;
                var quarterPi = pi$4 / 4;
                var tau$4 = pi$4 * 2;

                var degrees$1 = 180 / pi$4;
                var radians = pi$4 / 180;

                var abs = Math.abs;
                var atan = Math.atan;
                var atan2 = Math.atan2;
                var cos$1 = Math.cos;
                var ceil = Math.ceil;
                var exp = Math.exp;

                var log$1 = Math.log;
                var pow$1 = Math.pow;
                var sin$1 = Math.sin;
                var sign$1 = Math.sign || function(x) { return x > 0 ? 1 : x < 0 ? -1 : 0; };
                var sqrt$1 = Math.sqrt;
                var tan = Math.tan;

                function acos(x) {
                  return x > 1 ? 0 : x < -1 ? pi$4 : Math.acos(x);
                }

                function asin$1(x) {
                  return x > 1 ? halfPi$3 : x < -1 ? -halfPi$3 : Math.asin(x);
                }

                function haversin(x) {
                  return (x = sin$1(x / 2)) * x;
                }

                function noop$2() {}

                function streamGeometry(geometry, stream) {
                  if (geometry && streamGeometryType.hasOwnProperty(geometry.type)) {
                    streamGeometryType[geometry.type](geometry, stream);
                  }
                }

                var streamObjectType = {
                  Feature: function(feature, stream) {
                    streamGeometry(feature.geometry, stream);
                  },
                  FeatureCollection: function(object, stream) {
                    var features = object.features, i = -1, n = features.length;
                    while (++i < n) streamGeometry(features[i].geometry, stream);
                  }
                };

                var streamGeometryType = {
                  Sphere: function(object, stream) {
                    stream.sphere();
                  },
                  Point: function(object, stream) {
                    object = object.coordinates;
                    stream.point(object[0], object[1], object[2]);
                  },
                  MultiPoint: function(object, stream) {
                    var coordinates = object.coordinates, i = -1, n = coordinates.length;
                    while (++i < n) object = coordinates[i], stream.point(object[0], object[1], object[2]);
                  },
                  LineString: function(object, stream) {
                    streamLine(object.coordinates, stream, 0);
                  },
                  MultiLineString: function(object, stream) {
                    var coordinates = object.coordinates, i = -1, n = coordinates.length;
                    while (++i < n) streamLine(coordinates[i], stream, 0);
                  },
                  Polygon: function(object, stream) {
                    streamPolygon(object.coordinates, stream);
                  },
                  MultiPolygon: function(object, stream) {
                    var coordinates = object.coordinates, i = -1, n = coordinates.length;
                    while (++i < n) streamPolygon(coordinates[i], stream);
                  },
                  GeometryCollection: function(object, stream) {
                    var geometries = object.geometries, i = -1, n = geometries.length;
                    while (++i < n) streamGeometry(geometries[i], stream);
                  }
                };

                function streamLine(coordinates, stream, closed) {
                  var i = -1, n = coordinates.length - closed, coordinate;
                  stream.lineStart();
                  while (++i < n) coordinate = coordinates[i], stream.point(coordinate[0], coordinate[1], coordinate[2]);
                  stream.lineEnd();
                }

                function streamPolygon(coordinates, stream) {
                  var i = -1, n = coordinates.length;
                  stream.polygonStart();
                  while (++i < n) streamLine(coordinates[i], stream, 1);
                  stream.polygonEnd();
                }

                var geoStream = function(object, stream) {
                  if (object && streamObjectType.hasOwnProperty(object.type)) {
                    streamObjectType[object.type](object, stream);
                  } else {
                    streamGeometry(object, stream);
                  }
                };

                var areaRingSum = adder();

                var areaSum = adder();
                var lambda00;
                var phi00;
                var lambda0;
                var cosPhi0;
                var sinPhi0;

                var areaStream = {
                  point: noop$2,
                  lineStart: noop$2,
                  lineEnd: noop$2,
                  polygonStart: function() {
                    areaRingSum.reset();
                    areaStream.lineStart = areaRingStart;
                    areaStream.lineEnd = areaRingEnd;
                  },
                  polygonEnd: function() {
                    var areaRing = +areaRingSum;
                    areaSum.add(areaRing < 0 ? tau$4 + areaRing : areaRing);
                    this.lineStart = this.lineEnd = this.point = noop$2;
                  },
                  sphere: function() {
                    areaSum.add(tau$4);
                  }
                };

                function areaRingStart() {
                  areaStream.point = areaPointFirst;
                }

                function areaRingEnd() {
                  areaPoint(lambda00, phi00);
                }

                function areaPointFirst(lambda, phi) {
                  areaStream.point = areaPoint;
                  lambda00 = lambda, phi00 = phi;
                  lambda *= radians, phi *= radians;
                  lambda0 = lambda, cosPhi0 = cos$1(phi = phi / 2 + quarterPi), sinPhi0 = sin$1(phi);
                }

                function areaPoint(lambda, phi) {
                  lambda *= radians, phi *= radians;
                  phi = phi / 2 + quarterPi; // half the angular distance from south pole

                  // Spherical excess E for a spherical triangle with vertices: south pole,
                  // previous point, current point.  Uses a formula derived from Cagnoli’s
                  // theorem.  See Todhunter, Spherical Trig. (1871), Sec. 103, Eq. (2).
                  var dLambda = lambda - lambda0,
                      sdLambda = dLambda >= 0 ? 1 : -1,
                      adLambda = sdLambda * dLambda,
                      cosPhi = cos$1(phi),
                      sinPhi = sin$1(phi),
                      k = sinPhi0 * sinPhi,
                      u = cosPhi0 * cosPhi + k * cos$1(adLambda),
                      v = k * sdLambda * sin$1(adLambda);
                  areaRingSum.add(atan2(v, u));

                  // Advance the previous points.
                  lambda0 = lambda, cosPhi0 = cosPhi, sinPhi0 = sinPhi;
                }

                var area$2 = function(object) {
                  areaSum.reset();
                  geoStream(object, areaStream);
                  return areaSum * 2;
                };

                function spherical(cartesian) {
                  return [atan2(cartesian[1], cartesian[0]), asin$1(cartesian[2])];
                }

                function cartesian(spherical) {
                  var lambda = spherical[0], phi = spherical[1], cosPhi = cos$1(phi);
                  return [cosPhi * cos$1(lambda), cosPhi * sin$1(lambda), sin$1(phi)];
                }

                function cartesianDot(a, b) {
                  return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
                }

                function cartesianCross(a, b) {
                  return [a[1] * b[2] - a[2] * b[1], a[2] * b[0] - a[0] * b[2], a[0] * b[1] - a[1] * b[0]];
                }

                // TODO return a
                function cartesianAddInPlace(a, b) {
                  a[0] += b[0], a[1] += b[1], a[2] += b[2];
                }

                function cartesianScale(vector, k) {
                  return [vector[0] * k, vector[1] * k, vector[2] * k];
                }

                // TODO return d
                function cartesianNormalizeInPlace(d) {
                  var l = sqrt$1(d[0] * d[0] + d[1] * d[1] + d[2] * d[2]);
                  d[0] /= l, d[1] /= l, d[2] /= l;
                }

                var lambda0$1;
                var phi0;
                var lambda1;
                var phi1;
                var lambda2;
                var lambda00$1;
                var phi00$1;
                var p0;
                var deltaSum = adder();
                var ranges;
                var range$1;

                var boundsStream = {
                  point: boundsPoint,
                  lineStart: boundsLineStart,
                  lineEnd: boundsLineEnd,
                  polygonStart: function() {
                    boundsStream.point = boundsRingPoint;
                    boundsStream.lineStart = boundsRingStart;
                    boundsStream.lineEnd = boundsRingEnd;
                    deltaSum.reset();
                    areaStream.polygonStart();
                  },
                  polygonEnd: function() {
                    areaStream.polygonEnd();
                    boundsStream.point = boundsPoint;
                    boundsStream.lineStart = boundsLineStart;
                    boundsStream.lineEnd = boundsLineEnd;
                    if (areaRingSum < 0) lambda0$1 = -(lambda1 = 180), phi0 = -(phi1 = 90);
                    else if (deltaSum > epsilon$4) phi1 = 90;
                    else if (deltaSum < -epsilon$4) phi0 = -90;
                    range$1[0] = lambda0$1, range$1[1] = lambda1;
                  }
                };

                function boundsPoint(lambda, phi) {
                  ranges.push(range$1 = [lambda0$1 = lambda, lambda1 = lambda]);
                  if (phi < phi0) phi0 = phi;
                  if (phi > phi1) phi1 = phi;
                }

                function linePoint(lambda, phi) {
                  var p = cartesian([lambda * radians, phi * radians]);
                  if (p0) {
                    var normal = cartesianCross(p0, p),
                        equatorial = [normal[1], -normal[0], 0],
                        inflection = cartesianCross(equatorial, normal);
                    cartesianNormalizeInPlace(inflection);
                    inflection = spherical(inflection);
                    var delta = lambda - lambda2,
                        sign$$1 = delta > 0 ? 1 : -1,
                        lambdai = inflection[0] * degrees$1 * sign$$1,
                        phii,
                        antimeridian = abs(delta) > 180;
                    if (antimeridian ^ (sign$$1 * lambda2 < lambdai && lambdai < sign$$1 * lambda)) {
                      phii = inflection[1] * degrees$1;
                      if (phii > phi1) phi1 = phii;
                    } else if (lambdai = (lambdai + 360) % 360 - 180, antimeridian ^ (sign$$1 * lambda2 < lambdai && lambdai < sign$$1 * lambda)) {
                      phii = -inflection[1] * degrees$1;
                      if (phii < phi0) phi0 = phii;
                    } else {
                      if (phi < phi0) phi0 = phi;
                      if (phi > phi1) phi1 = phi;
                    }
                    if (antimeridian) {
                      if (lambda < lambda2) {
                        if (angle(lambda0$1, lambda) > angle(lambda0$1, lambda1)) lambda1 = lambda;
                      } else {
                        if (angle(lambda, lambda1) > angle(lambda0$1, lambda1)) lambda0$1 = lambda;
                      }
                    } else {
                      if (lambda1 >= lambda0$1) {
                        if (lambda < lambda0$1) lambda0$1 = lambda;
                        if (lambda > lambda1) lambda1 = lambda;
                      } else {
                        if (lambda > lambda2) {
                          if (angle(lambda0$1, lambda) > angle(lambda0$1, lambda1)) lambda1 = lambda;
                        } else {
                          if (angle(lambda, lambda1) > angle(lambda0$1, lambda1)) lambda0$1 = lambda;
                        }
                      }
                    }
                  } else {
                    boundsPoint(lambda, phi);
                  }
                  p0 = p, lambda2 = lambda;
                }

                function boundsLineStart() {
                  boundsStream.point = linePoint;
                }

                function boundsLineEnd() {
                  range$1[0] = lambda0$1, range$1[1] = lambda1;
                  boundsStream.point = boundsPoint;
                  p0 = null;
                }

                function boundsRingPoint(lambda, phi) {
                  if (p0) {
                    var delta = lambda - lambda2;
                    deltaSum.add(abs(delta) > 180 ? delta + (delta > 0 ? 360 : -360) : delta);
                  } else {
                    lambda00$1 = lambda, phi00$1 = phi;
                  }
                  areaStream.point(lambda, phi);
                  linePoint(lambda, phi);
                }

                function boundsRingStart() {
                  areaStream.lineStart();
                }

                function boundsRingEnd() {
                  boundsRingPoint(lambda00$1, phi00$1);
                  areaStream.lineEnd();
                  if (abs(deltaSum) > epsilon$4) lambda0$1 = -(lambda1 = 180);
                  range$1[0] = lambda0$1, range$1[1] = lambda1;
                  p0 = null;
                }

                // Finds the left-right distance between two longitudes.
                // This is almost the same as (lambda1 - lambda0 + 360°) % 360°, except that we want
                // the distance between ±180° to be 360°.
                function angle(lambda0, lambda1) {
                  return (lambda1 -= lambda0) < 0 ? lambda1 + 360 : lambda1;
                }

                function rangeCompare(a, b) {
                  return a[0] - b[0];
                }

                function rangeContains(range, x) {
                  return range[0] <= range[1] ? range[0] <= x && x <= range[1] : x < range[0] || range[1] < x;
                }

                var bounds = function(feature) {
                  var i, n, a, b, merged, deltaMax, delta;

                  phi1 = lambda1 = -(lambda0$1 = phi0 = Infinity);
                  ranges = [];
                  geoStream(feature, boundsStream);

                  // First, sort ranges by their minimum longitudes.
                  if (n = ranges.length) {
                    ranges.sort(rangeCompare);

                    // Then, merge any ranges that overlap.
                    for (i = 1, a = ranges[0], merged = [a]; i < n; ++i) {
                      b = ranges[i];
                      if (rangeContains(a, b[0]) || rangeContains(a, b[1])) {
                        if (angle(a[0], b[1]) > angle(a[0], a[1])) a[1] = b[1];
                        if (angle(b[0], a[1]) > angle(a[0], a[1])) a[0] = b[0];
                      } else {
                        merged.push(a = b);
                      }
                    }

                    // Finally, find the largest gap between the merged ranges.
                    // The final bounding box will be the inverse of this gap.
                    for (deltaMax = -Infinity, n = merged.length - 1, i = 0, a = merged[n]; i <= n; a = b, ++i) {
                      b = merged[i];
                      if ((delta = angle(a[1], b[0])) > deltaMax) deltaMax = delta, lambda0$1 = b[0], lambda1 = a[1];
                    }
                  }

                  ranges = range$1 = null;

                  return lambda0$1 === Infinity || phi0 === Infinity
                      ? [[NaN, NaN], [NaN, NaN]]
                      : [[lambda0$1, phi0], [lambda1, phi1]];
                };

                var W0;
                var W1;
                var X0;
                var Y0;
                var Z0;
                var X1;
                var Y1;
                var Z1;
                var X2;
                var Y2;
                var Z2;
                var lambda00$2;
                var phi00$2;
                var x0;
                var y0;
                var z0; // previous point

                var centroidStream = {
                  sphere: noop$2,
                  point: centroidPoint,
                  lineStart: centroidLineStart,
                  lineEnd: centroidLineEnd,
                  polygonStart: function() {
                    centroidStream.lineStart = centroidRingStart;
                    centroidStream.lineEnd = centroidRingEnd;
                  },
                  polygonEnd: function() {
                    centroidStream.lineStart = centroidLineStart;
                    centroidStream.lineEnd = centroidLineEnd;
                  }
                };

                // Arithmetic mean of Cartesian vectors.
                function centroidPoint(lambda, phi) {
                  lambda *= radians, phi *= radians;
                  var cosPhi = cos$1(phi);
                  centroidPointCartesian(cosPhi * cos$1(lambda), cosPhi * sin$1(lambda), sin$1(phi));
                }

                function centroidPointCartesian(x, y, z) {
                  ++W0;
                  X0 += (x - X0) / W0;
                  Y0 += (y - Y0) / W0;
                  Z0 += (z - Z0) / W0;
                }

                function centroidLineStart() {
                  centroidStream.point = centroidLinePointFirst;
                }

                function centroidLinePointFirst(lambda, phi) {
                  lambda *= radians, phi *= radians;
                  var cosPhi = cos$1(phi);
                  x0 = cosPhi * cos$1(lambda);
                  y0 = cosPhi * sin$1(lambda);
                  z0 = sin$1(phi);
                  centroidStream.point = centroidLinePoint;
                  centroidPointCartesian(x0, y0, z0);
                }

                function centroidLinePoint(lambda, phi) {
                  lambda *= radians, phi *= radians;
                  var cosPhi = cos$1(phi),
                      x = cosPhi * cos$1(lambda),
                      y = cosPhi * sin$1(lambda),
                      z = sin$1(phi),
                      w = atan2(sqrt$1((w = y0 * z - z0 * y) * w + (w = z0 * x - x0 * z) * w + (w = x0 * y - y0 * x) * w), x0 * x + y0 * y + z0 * z);
                  W1 += w;
                  X1 += w * (x0 + (x0 = x));
                  Y1 += w * (y0 + (y0 = y));
                  Z1 += w * (z0 + (z0 = z));
                  centroidPointCartesian(x0, y0, z0);
                }

                function centroidLineEnd() {
                  centroidStream.point = centroidPoint;
                }

                // See J. E. Brock, The Inertia Tensor for a Spherical Triangle,
                // J. Applied Mechanics 42, 239 (1975).
                function centroidRingStart() {
                  centroidStream.point = centroidRingPointFirst;
                }

                function centroidRingEnd() {
                  centroidRingPoint(lambda00$2, phi00$2);
                  centroidStream.point = centroidPoint;
                }

                function centroidRingPointFirst(lambda, phi) {
                  lambda00$2 = lambda, phi00$2 = phi;
                  lambda *= radians, phi *= radians;
                  centroidStream.point = centroidRingPoint;
                  var cosPhi = cos$1(phi);
                  x0 = cosPhi * cos$1(lambda);
                  y0 = cosPhi * sin$1(lambda);
                  z0 = sin$1(phi);
                  centroidPointCartesian(x0, y0, z0);
                }

                function centroidRingPoint(lambda, phi) {
                  lambda *= radians, phi *= radians;
                  var cosPhi = cos$1(phi),
                      x = cosPhi * cos$1(lambda),
                      y = cosPhi * sin$1(lambda),
                      z = sin$1(phi),
                      cx = y0 * z - z0 * y,
                      cy = z0 * x - x0 * z,
                      cz = x0 * y - y0 * x,
                      m = sqrt$1(cx * cx + cy * cy + cz * cz),
                      u = x0 * x + y0 * y + z0 * z,
                      v = m && -acos(u) / m, // area weight
                      w = atan2(m, u); // line weight
                  X2 += v * cx;
                  Y2 += v * cy;
                  Z2 += v * cz;
                  W1 += w;
                  X1 += w * (x0 + (x0 = x));
                  Y1 += w * (y0 + (y0 = y));
                  Z1 += w * (z0 + (z0 = z));
                  centroidPointCartesian(x0, y0, z0);
                }

                var centroid$1 = function(object) {
                  W0 = W1 =
                  X0 = Y0 = Z0 =
                  X1 = Y1 = Z1 =
                  X2 = Y2 = Z2 = 0;
                  geoStream(object, centroidStream);

                  var x = X2,
                      y = Y2,
                      z = Z2,
                      m = x * x + y * y + z * z;

                  // If the area-weighted ccentroid is undefined, fall back to length-weighted ccentroid.
                  if (m < epsilon2$2) {
                    x = X1, y = Y1, z = Z1;
                    // If the feature has zero length, fall back to arithmetic mean of point vectors.
                    if (W1 < epsilon$4) x = X0, y = Y0, z = Z0;
                    m = x * x + y * y + z * z;
                    // If the feature still has an undefined ccentroid, then return.
                    if (m < epsilon2$2) return [NaN, NaN];
                  }

                  return [atan2(y, x) * degrees$1, asin$1(z / sqrt$1(m)) * degrees$1];
                };

                var constant$13 = function(x) {
                  return function() {
                    return x;
                  };
                };

                var compose = function(a, b) {

                  function compose(x, y) {
                    return x = a(x, y), b(x[0], x[1]);
                  }

                  if (a.invert && b.invert) compose.invert = function(x, y) {
                    return x = b.invert(x, y), x && a.invert(x[0], x[1]);
                  };

                  return compose;
                };

                function rotationIdentity(lambda, phi) {
                  return [lambda > pi$4 ? lambda - tau$4 : lambda < -pi$4 ? lambda + tau$4 : lambda, phi];
                }

                rotationIdentity.invert = rotationIdentity;

                function rotateRadians(deltaLambda, deltaPhi, deltaGamma) {
                  return (deltaLambda %= tau$4) ? (deltaPhi || deltaGamma ? compose(rotationLambda(deltaLambda), rotationPhiGamma(deltaPhi, deltaGamma))
                    : rotationLambda(deltaLambda))
                    : (deltaPhi || deltaGamma ? rotationPhiGamma(deltaPhi, deltaGamma)
                    : rotationIdentity);
                }

                function forwardRotationLambda(deltaLambda) {
                  return function(lambda, phi) {
                    return lambda += deltaLambda, [lambda > pi$4 ? lambda - tau$4 : lambda < -pi$4 ? lambda + tau$4 : lambda, phi];
                  };
                }

                function rotationLambda(deltaLambda) {
                  var rotation = forwardRotationLambda(deltaLambda);
                  rotation.invert = forwardRotationLambda(-deltaLambda);
                  return rotation;
                }

                function rotationPhiGamma(deltaPhi, deltaGamma) {
                  var cosDeltaPhi = cos$1(deltaPhi),
                      sinDeltaPhi = sin$1(deltaPhi),
                      cosDeltaGamma = cos$1(deltaGamma),
                      sinDeltaGamma = sin$1(deltaGamma);

                  function rotation(lambda, phi) {
                    var cosPhi = cos$1(phi),
                        x = cos$1(lambda) * cosPhi,
                        y = sin$1(lambda) * cosPhi,
                        z = sin$1(phi),
                        k = z * cosDeltaPhi + x * sinDeltaPhi;
                    return [
                      atan2(y * cosDeltaGamma - k * sinDeltaGamma, x * cosDeltaPhi - z * sinDeltaPhi),
                      asin$1(k * cosDeltaGamma + y * sinDeltaGamma)
                    ];
                  }

                  rotation.invert = function(lambda, phi) {
                    var cosPhi = cos$1(phi),
                        x = cos$1(lambda) * cosPhi,
                        y = sin$1(lambda) * cosPhi,
                        z = sin$1(phi),
                        k = z * cosDeltaGamma - y * sinDeltaGamma;
                    return [
                      atan2(y * cosDeltaGamma + z * sinDeltaGamma, x * cosDeltaPhi + k * sinDeltaPhi),
                      asin$1(k * cosDeltaPhi - x * sinDeltaPhi)
                    ];
                  };

                  return rotation;
                }

                var rotation = function(rotate) {
                  rotate = rotateRadians(rotate[0] * radians, rotate[1] * radians, rotate.length > 2 ? rotate[2] * radians : 0);

                  function forward(coordinates) {
                    coordinates = rotate(coordinates[0] * radians, coordinates[1] * radians);
                    return coordinates[0] *= degrees$1, coordinates[1] *= degrees$1, coordinates;
                  }

                  forward.invert = function(coordinates) {
                    coordinates = rotate.invert(coordinates[0] * radians, coordinates[1] * radians);
                    return coordinates[0] *= degrees$1, coordinates[1] *= degrees$1, coordinates;
                  };

                  return forward;
                };

                // Generates a circle centered at [0°, 0°], with a given radius and precision.
                function circleStream(stream, radius, delta, direction, t0, t1) {
                  if (!delta) return;
                  var cosRadius = cos$1(radius),
                      sinRadius = sin$1(radius),
                      step = direction * delta;
                  if (t0 == null) {
                    t0 = radius + direction * tau$4;
                    t1 = radius - step / 2;
                  } else {
                    t0 = circleRadius(cosRadius, t0);
                    t1 = circleRadius(cosRadius, t1);
                    if (direction > 0 ? t0 < t1 : t0 > t1) t0 += direction * tau$4;
                  }
                  for (var point, t = t0; direction > 0 ? t > t1 : t < t1; t -= step) {
                    point = spherical([cosRadius, -sinRadius * cos$1(t), -sinRadius * sin$1(t)]);
                    stream.point(point[0], point[1]);
                  }
                }

                // Returns the signed angle of a cartesian point relative to [cosRadius, 0, 0].
                function circleRadius(cosRadius, point) {
                  point = cartesian(point), point[0] -= cosRadius;
                  cartesianNormalizeInPlace(point);
                  var radius = acos(-point[1]);
                  return ((-point[2] < 0 ? -radius : radius) + tau$4 - epsilon$4) % tau$4;
                }

                var circle$1 = function() {
                  var center = constant$13([0, 0]),
                      radius = constant$13(90),
                      precision = constant$13(6),
                      ring,
                      rotate,
                      stream = {point: point};

                  function point(x, y) {
                    ring.push(x = rotate(x, y));
                    x[0] *= degrees$1, x[1] *= degrees$1;
                  }

                  function circle() {
                    var c = center.apply(this, arguments),
                        r = radius.apply(this, arguments) * radians,
                        p = precision.apply(this, arguments) * radians;
                    ring = [];
                    rotate = rotateRadians(-c[0] * radians, -c[1] * radians, 0).invert;
                    circleStream(stream, r, p, 1);
                    c = {type: "Polygon", coordinates: [ring]};
                    ring = rotate = null;
                    return c;
                  }

                  circle.center = function(_) {
                    return arguments.length ? (center = typeof _ === "function" ? _ : constant$13([+_[0], +_[1]]), circle) : center;
                  };

                  circle.radius = function(_) {
                    return arguments.length ? (radius = typeof _ === "function" ? _ : constant$13(+_), circle) : radius;
                  };

                  circle.precision = function(_) {
                    return arguments.length ? (precision = typeof _ === "function" ? _ : constant$13(+_), circle) : precision;
                  };

                  return circle;
                };

                var clipBuffer = function() {
                  var lines = [],
                      line;
                  return {
                    point: function(x, y) {
                      line.push([x, y]);
                    },
                    lineStart: function() {
                      lines.push(line = []);
                    },
                    lineEnd: noop$2,
                    rejoin: function() {
                      if (lines.length > 1) lines.push(lines.pop().concat(lines.shift()));
                    },
                    result: function() {
                      var result = lines;
                      lines = [];
                      line = null;
                      return result;
                    }
                  };
                };

                var clipLine = function(a, b, x0, y0, x1, y1) {
                  var ax = a[0],
                      ay = a[1],
                      bx = b[0],
                      by = b[1],
                      t0 = 0,
                      t1 = 1,
                      dx = bx - ax,
                      dy = by - ay,
                      r;

                  r = x0 - ax;
                  if (!dx && r > 0) return;
                  r /= dx;
                  if (dx < 0) {
                    if (r < t0) return;
                    if (r < t1) t1 = r;
                  } else if (dx > 0) {
                    if (r > t1) return;
                    if (r > t0) t0 = r;
                  }

                  r = x1 - ax;
                  if (!dx && r < 0) return;
                  r /= dx;
                  if (dx < 0) {
                    if (r > t1) return;
                    if (r > t0) t0 = r;
                  } else if (dx > 0) {
                    if (r < t0) return;
                    if (r < t1) t1 = r;
                  }

                  r = y0 - ay;
                  if (!dy && r > 0) return;
                  r /= dy;
                  if (dy < 0) {
                    if (r < t0) return;
                    if (r < t1) t1 = r;
                  } else if (dy > 0) {
                    if (r > t1) return;
                    if (r > t0) t0 = r;
                  }

                  r = y1 - ay;
                  if (!dy && r < 0) return;
                  r /= dy;
                  if (dy < 0) {
                    if (r > t1) return;
                    if (r > t0) t0 = r;
                  } else if (dy > 0) {
                    if (r < t0) return;
                    if (r < t1) t1 = r;
                  }

                  if (t0 > 0) a[0] = ax + t0 * dx, a[1] = ay + t0 * dy;
                  if (t1 < 1) b[0] = ax + t1 * dx, b[1] = ay + t1 * dy;
                  return true;
                };

                var pointEqual = function(a, b) {
                  return abs(a[0] - b[0]) < epsilon$4 && abs(a[1] - b[1]) < epsilon$4;
                };

                function Intersection(point, points, other, entry) {
                  this.x = point;
                  this.z = points;
                  this.o = other; // another intersection
                  this.e = entry; // is an entry?
                  this.v = false; // visited
                  this.n = this.p = null; // next & previous
                }

                // A generalized polygon clipping algorithm: given a polygon that has been cut
                // into its visible line segments, and rejoins the segments by interpolating
                // along the clip edge.
                var clipPolygon = function(segments, compareIntersection, startInside, interpolate, stream) {
                  var subject = [],
                      clip = [],
                      i,
                      n;

                  segments.forEach(function(segment) {
                    if ((n = segment.length - 1) <= 0) return;
                    var n, p0 = segment[0], p1 = segment[n], x;

                    // If the first and last points of a segment are coincident, then treat as a
                    // closed ring. TODO if all rings are closed, then the winding order of the
                    // exterior ring should be checked.
                    if (pointEqual(p0, p1)) {
                      stream.lineStart();
                      for (i = 0; i < n; ++i) stream.point((p0 = segment[i])[0], p0[1]);
                      stream.lineEnd();
                      return;
                    }

                    subject.push(x = new Intersection(p0, segment, null, true));
                    clip.push(x.o = new Intersection(p0, null, x, false));
                    subject.push(x = new Intersection(p1, segment, null, false));
                    clip.push(x.o = new Intersection(p1, null, x, true));
                  });

                  if (!subject.length) return;

                  clip.sort(compareIntersection);
                  link$1(subject);
                  link$1(clip);

                  for (i = 0, n = clip.length; i < n; ++i) {
                    clip[i].e = startInside = !startInside;
                  }

                  var start = subject[0],
                      points,
                      point;

                  while (1) {
                    // Find first unvisited intersection.
                    var current = start,
                        isSubject = true;
                    while (current.v) if ((current = current.n) === start) return;
                    points = current.z;
                    stream.lineStart();
                    do {
                      current.v = current.o.v = true;
                      if (current.e) {
                        if (isSubject) {
                          for (i = 0, n = points.length; i < n; ++i) stream.point((point = points[i])[0], point[1]);
                        } else {
                          interpolate(current.x, current.n.x, 1, stream);
                        }
                        current = current.n;
                      } else {
                        if (isSubject) {
                          points = current.p.z;
                          for (i = points.length - 1; i >= 0; --i) stream.point((point = points[i])[0], point[1]);
                        } else {
                          interpolate(current.x, current.p.x, -1, stream);
                        }
                        current = current.p;
                      }
                      current = current.o;
                      points = current.z;
                      isSubject = !isSubject;
                    } while (!current.v);
                    stream.lineEnd();
                  }
                };

                function link$1(array) {
                  if (!(n = array.length)) return;
                  var n,
                      i = 0,
                      a = array[0],
                      b;
                  while (++i < n) {
                    a.n = b = array[i];
                    b.p = a;
                    a = b;
                  }
                  a.n = b = array[0];
                  b.p = a;
                }

                var clipMax = 1e9;
                var clipMin = -clipMax;

                // TODO Use d3-polygon’s polygonContains here for the ring check?
                // TODO Eliminate duplicate buffering in clipBuffer and polygon.push?

                function clipExtent(x0, y0, x1, y1) {

                  function visible(x, y) {
                    return x0 <= x && x <= x1 && y0 <= y && y <= y1;
                  }

                  function interpolate(from, to, direction, stream) {
                    var a = 0, a1 = 0;
                    if (from == null
                        || (a = corner(from, direction)) !== (a1 = corner(to, direction))
                        || comparePoint(from, to) < 0 ^ direction > 0) {
                      do stream.point(a === 0 || a === 3 ? x0 : x1, a > 1 ? y1 : y0);
                      while ((a = (a + direction + 4) % 4) !== a1);
                    } else {
                      stream.point(to[0], to[1]);
                    }
                  }

                  function corner(p, direction) {
                    return abs(p[0] - x0) < epsilon$4 ? direction > 0 ? 0 : 3
                        : abs(p[0] - x1) < epsilon$4 ? direction > 0 ? 2 : 1
                        : abs(p[1] - y0) < epsilon$4 ? direction > 0 ? 1 : 0
                        : direction > 0 ? 3 : 2; // abs(p[1] - y1) < epsilon
                  }

                  function compareIntersection(a, b) {
                    return comparePoint(a.x, b.x);
                  }

                  function comparePoint(a, b) {
                    var ca = corner(a, 1),
                        cb = corner(b, 1);
                    return ca !== cb ? ca - cb
                        : ca === 0 ? b[1] - a[1]
                        : ca === 1 ? a[0] - b[0]
                        : ca === 2 ? a[1] - b[1]
                        : b[0] - a[0];
                  }

                  return function(stream) {
                    var activeStream = stream,
                        bufferStream = clipBuffer(),
                        segments,
                        polygon,
                        ring,
                        x__, y__, v__, // first point
                        x_, y_, v_, // previous point
                        first,
                        clean;

                    var clipStream = {
                      point: point,
                      lineStart: lineStart,
                      lineEnd: lineEnd,
                      polygonStart: polygonStart,
                      polygonEnd: polygonEnd
                    };

                    function point(x, y) {
                      if (visible(x, y)) activeStream.point(x, y);
                    }

                    function polygonInside() {
                      var winding = 0;

                      for (var i = 0, n = polygon.length; i < n; ++i) {
                        for (var ring = polygon[i], j = 1, m = ring.length, point = ring[0], a0, a1, b0 = point[0], b1 = point[1]; j < m; ++j) {
                          a0 = b0, a1 = b1, point = ring[j], b0 = point[0], b1 = point[1];
                          if (a1 <= y1) { if (b1 > y1 && (b0 - a0) * (y1 - a1) > (b1 - a1) * (x0 - a0)) ++winding; }
                          else { if (b1 <= y1 && (b0 - a0) * (y1 - a1) < (b1 - a1) * (x0 - a0)) --winding; }
                        }
                      }

                      return winding;
                    }

                    // Buffer geometry within a polygon and then clip it en masse.
                    function polygonStart() {
                      activeStream = bufferStream, segments = [], polygon = [], clean = true;
                    }

                    function polygonEnd() {
                      var startInside = polygonInside(),
                          cleanInside = clean && startInside,
                          visible = (segments = merge(segments)).length;
                      if (cleanInside || visible) {
                        stream.polygonStart();
                        if (cleanInside) {
                          stream.lineStart();
                          interpolate(null, null, 1, stream);
                          stream.lineEnd();
                        }
                        if (visible) {
                          clipPolygon(segments, compareIntersection, startInside, interpolate, stream);
                        }
                        stream.polygonEnd();
                      }
                      activeStream = stream, segments = polygon = ring = null;
                    }

                    function lineStart() {
                      clipStream.point = linePoint;
                      if (polygon) polygon.push(ring = []);
                      first = true;
                      v_ = false;
                      x_ = y_ = NaN;
                    }

                    // TODO rather than special-case polygons, simply handle them separately.
                    // Ideally, coincident intersection points should be jittered to avoid
                    // clipping issues.
                    function lineEnd() {
                      if (segments) {
                        linePoint(x__, y__);
                        if (v__ && v_) bufferStream.rejoin();
                        segments.push(bufferStream.result());
                      }
                      clipStream.point = point;
                      if (v_) activeStream.lineEnd();
                    }

                    function linePoint(x, y) {
                      var v = visible(x, y);
                      if (polygon) ring.push([x, y]);
                      if (first) {
                        x__ = x, y__ = y, v__ = v;
                        first = false;
                        if (v) {
                          activeStream.lineStart();
                          activeStream.point(x, y);
                        }
                      } else {
                        if (v && v_) activeStream.point(x, y);
                        else {
                          var a = [x_ = Math.max(clipMin, Math.min(clipMax, x_)), y_ = Math.max(clipMin, Math.min(clipMax, y_))],
                              b = [x = Math.max(clipMin, Math.min(clipMax, x)), y = Math.max(clipMin, Math.min(clipMax, y))];
                          if (clipLine(a, b, x0, y0, x1, y1)) {
                            if (!v_) {
                              activeStream.lineStart();
                              activeStream.point(a[0], a[1]);
                            }
                            activeStream.point(b[0], b[1]);
                            if (!v) activeStream.lineEnd();
                            clean = false;
                          } else if (v) {
                            activeStream.lineStart();
                            activeStream.point(x, y);
                            clean = false;
                          }
                        }
                      }
                      x_ = x, y_ = y, v_ = v;
                    }

                    return clipStream;
                  };
                }

                var extent$1 = function() {
                  var x0 = 0,
                      y0 = 0,
                      x1 = 960,
                      y1 = 500,
                      cache,
                      cacheStream,
                      clip;

                  return clip = {
                    stream: function(stream) {
                      return cache && cacheStream === stream ? cache : cache = clipExtent(x0, y0, x1, y1)(cacheStream = stream);
                    },
                    extent: function(_) {
                      return arguments.length ? (x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1], cache = cacheStream = null, clip) : [[x0, y0], [x1, y1]];
                    }
                  };
                };

                var lengthSum = adder();
                var lambda0$2;
                var sinPhi0$1;
                var cosPhi0$1;

                var lengthStream = {
                  sphere: noop$2,
                  point: noop$2,
                  lineStart: lengthLineStart,
                  lineEnd: noop$2,
                  polygonStart: noop$2,
                  polygonEnd: noop$2
                };

                function lengthLineStart() {
                  lengthStream.point = lengthPointFirst;
                  lengthStream.lineEnd = lengthLineEnd;
                }

                function lengthLineEnd() {
                  lengthStream.point = lengthStream.lineEnd = noop$2;
                }

                function lengthPointFirst(lambda, phi) {
                  lambda *= radians, phi *= radians;
                  lambda0$2 = lambda, sinPhi0$1 = sin$1(phi), cosPhi0$1 = cos$1(phi);
                  lengthStream.point = lengthPoint;
                }

                function lengthPoint(lambda, phi) {
                  lambda *= radians, phi *= radians;
                  var sinPhi = sin$1(phi),
                      cosPhi = cos$1(phi),
                      delta = abs(lambda - lambda0$2),
                      cosDelta = cos$1(delta),
                      sinDelta = sin$1(delta),
                      x = cosPhi * sinDelta,
                      y = cosPhi0$1 * sinPhi - sinPhi0$1 * cosPhi * cosDelta,
                      z = sinPhi0$1 * sinPhi + cosPhi0$1 * cosPhi * cosDelta;
                  lengthSum.add(atan2(sqrt$1(x * x + y * y), z));
                  lambda0$2 = lambda, sinPhi0$1 = sinPhi, cosPhi0$1 = cosPhi;
                }

                var length$2 = function(object) {
                  lengthSum.reset();
                  geoStream(object, lengthStream);
                  return +lengthSum;
                };

                var coordinates = [null, null];
                var object$1 = {type: "LineString", coordinates: coordinates};

                var distance = function(a, b) {
                  coordinates[0] = a;
                  coordinates[1] = b;
                  return length$2(object$1);
                };

                function graticuleX(y0, y1, dy) {
                  var y = range(y0, y1 - epsilon$4, dy).concat(y1);
                  return function(x) { return y.map(function(y) { return [x, y]; }); };
                }

                function graticuleY(x0, x1, dx) {
                  var x = range(x0, x1 - epsilon$4, dx).concat(x1);
                  return function(y) { return x.map(function(x) { return [x, y]; }); };
                }

                function graticule() {
                  var x1, x0, X1, X0,
                      y1, y0, Y1, Y0,
                      dx = 10, dy = dx, DX = 90, DY = 360,
                      x, y, X, Y,
                      precision = 2.5;

                  function graticule() {
                    return {type: "MultiLineString", coordinates: lines()};
                  }

                  function lines() {
                    return range(ceil(X0 / DX) * DX, X1, DX).map(X)
                        .concat(range(ceil(Y0 / DY) * DY, Y1, DY).map(Y))
                        .concat(range(ceil(x0 / dx) * dx, x1, dx).filter(function(x) { return abs(x % DX) > epsilon$4; }).map(x))
                        .concat(range(ceil(y0 / dy) * dy, y1, dy).filter(function(y) { return abs(y % DY) > epsilon$4; }).map(y));
                  }

                  graticule.lines = function() {
                    return lines().map(function(coordinates) { return {type: "LineString", coordinates: coordinates}; });
                  };

                  graticule.outline = function() {
                    return {
                      type: "Polygon",
                      coordinates: [
                        X(X0).concat(
                        Y(Y1).slice(1),
                        X(X1).reverse().slice(1),
                        Y(Y0).reverse().slice(1))
                      ]
                    };
                  };

                  graticule.extent = function(_) {
                    if (!arguments.length) return graticule.extentMinor();
                    return graticule.extentMajor(_).extentMinor(_);
                  };

                  graticule.extentMajor = function(_) {
                    if (!arguments.length) return [[X0, Y0], [X1, Y1]];
                    X0 = +_[0][0], X1 = +_[1][0];
                    Y0 = +_[0][1], Y1 = +_[1][1];
                    if (X0 > X1) _ = X0, X0 = X1, X1 = _;
                    if (Y0 > Y1) _ = Y0, Y0 = Y1, Y1 = _;
                    return graticule.precision(precision);
                  };

                  graticule.extentMinor = function(_) {
                    if (!arguments.length) return [[x0, y0], [x1, y1]];
                    x0 = +_[0][0], x1 = +_[1][0];
                    y0 = +_[0][1], y1 = +_[1][1];
                    if (x0 > x1) _ = x0, x0 = x1, x1 = _;
                    if (y0 > y1) _ = y0, y0 = y1, y1 = _;
                    return graticule.precision(precision);
                  };

                  graticule.step = function(_) {
                    if (!arguments.length) return graticule.stepMinor();
                    return graticule.stepMajor(_).stepMinor(_);
                  };

                  graticule.stepMajor = function(_) {
                    if (!arguments.length) return [DX, DY];
                    DX = +_[0], DY = +_[1];
                    return graticule;
                  };

                  graticule.stepMinor = function(_) {
                    if (!arguments.length) return [dx, dy];
                    dx = +_[0], dy = +_[1];
                    return graticule;
                  };

                  graticule.precision = function(_) {
                    if (!arguments.length) return precision;
                    precision = +_;
                    x = graticuleX(y0, y1, 90);
                    y = graticuleY(x0, x1, precision);
                    X = graticuleX(Y0, Y1, 90);
                    Y = graticuleY(X0, X1, precision);
                    return graticule;
                  };

                  return graticule
                      .extentMajor([[-180, -90 + epsilon$4], [180, 90 - epsilon$4]])
                      .extentMinor([[-180, -80 - epsilon$4], [180, 80 + epsilon$4]]);
                }

                function graticule10() {
                  return graticule()();
                }

                var interpolate$2 = function(a, b) {
                  var x0 = a[0] * radians,
                      y0 = a[1] * radians,
                      x1 = b[0] * radians,
                      y1 = b[1] * radians,
                      cy0 = cos$1(y0),
                      sy0 = sin$1(y0),
                      cy1 = cos$1(y1),
                      sy1 = sin$1(y1),
                      kx0 = cy0 * cos$1(x0),
                      ky0 = cy0 * sin$1(x0),
                      kx1 = cy1 * cos$1(x1),
                      ky1 = cy1 * sin$1(x1),
                      d = 2 * asin$1(sqrt$1(haversin(y1 - y0) + cy0 * cy1 * haversin(x1 - x0))),
                      k = sin$1(d);

                  var interpolate = d ? function(t) {
                    var B = sin$1(t *= d) / k,
                        A = sin$1(d - t) / k,
                        x = A * kx0 + B * kx1,
                        y = A * ky0 + B * ky1,
                        z = A * sy0 + B * sy1;
                    return [
                      atan2(y, x) * degrees$1,
                      atan2(z, sqrt$1(x * x + y * y)) * degrees$1
                    ];
                  } : function() {
                    return [x0 * degrees$1, y0 * degrees$1];
                  };

                  interpolate.distance = d;

                  return interpolate;
                };

                var identity$7 = function(x) {
                  return x;
                };

                var areaSum$1 = adder();
                var areaRingSum$1 = adder();
                var x00;
                var y00;
                var x0$1;
                var y0$1;

                var areaStream$1 = {
                  point: noop$2,
                  lineStart: noop$2,
                  lineEnd: noop$2,
                  polygonStart: function() {
                    areaStream$1.lineStart = areaRingStart$1;
                    areaStream$1.lineEnd = areaRingEnd$1;
                  },
                  polygonEnd: function() {
                    areaStream$1.lineStart = areaStream$1.lineEnd = areaStream$1.point = noop$2;
                    areaSum$1.add(abs(areaRingSum$1));
                    areaRingSum$1.reset();
                  },
                  result: function() {
                    var area = areaSum$1 / 2;
                    areaSum$1.reset();
                    return area;
                  }
                };

                function areaRingStart$1() {
                  areaStream$1.point = areaPointFirst$1;
                }

                function areaPointFirst$1(x, y) {
                  areaStream$1.point = areaPoint$1;
                  x00 = x0$1 = x, y00 = y0$1 = y;
                }

                function areaPoint$1(x, y) {
                  areaRingSum$1.add(y0$1 * x - x0$1 * y);
                  x0$1 = x, y0$1 = y;
                }

                function areaRingEnd$1() {
                  areaPoint$1(x00, y00);
                }

                var x0$2 = Infinity;
                var y0$2 = x0$2;
                var x1 = -x0$2;
                var y1 = x1;

                var boundsStream$1 = {
                  point: boundsPoint$1,
                  lineStart: noop$2,
                  lineEnd: noop$2,
                  polygonStart: noop$2,
                  polygonEnd: noop$2,
                  result: function() {
                    var bounds = [[x0$2, y0$2], [x1, y1]];
                    x1 = y1 = -(y0$2 = x0$2 = Infinity);
                    return bounds;
                  }
                };

                function boundsPoint$1(x, y) {
                  if (x < x0$2) x0$2 = x;
                  if (x > x1) x1 = x;
                  if (y < y0$2) y0$2 = y;
                  if (y > y1) y1 = y;
                }

                // TODO Enforce positive area for exterior, negative area for interior?

                var X0$1 = 0;
                var Y0$1 = 0;
                var Z0$1 = 0;
                var X1$1 = 0;
                var Y1$1 = 0;
                var Z1$1 = 0;
                var X2$1 = 0;
                var Y2$1 = 0;
                var Z2$1 = 0;
                var x00$1;
                var y00$1;
                var x0$3;
                var y0$3;

                var centroidStream$1 = {
                  point: centroidPoint$1,
                  lineStart: centroidLineStart$1,
                  lineEnd: centroidLineEnd$1,
                  polygonStart: function() {
                    centroidStream$1.lineStart = centroidRingStart$1;
                    centroidStream$1.lineEnd = centroidRingEnd$1;
                  },
                  polygonEnd: function() {
                    centroidStream$1.point = centroidPoint$1;
                    centroidStream$1.lineStart = centroidLineStart$1;
                    centroidStream$1.lineEnd = centroidLineEnd$1;
                  },
                  result: function() {
                    var centroid = Z2$1 ? [X2$1 / Z2$1, Y2$1 / Z2$1]
                        : Z1$1 ? [X1$1 / Z1$1, Y1$1 / Z1$1]
                        : Z0$1 ? [X0$1 / Z0$1, Y0$1 / Z0$1]
                        : [NaN, NaN];
                    X0$1 = Y0$1 = Z0$1 =
                    X1$1 = Y1$1 = Z1$1 =
                    X2$1 = Y2$1 = Z2$1 = 0;
                    return centroid;
                  }
                };

                function centroidPoint$1(x, y) {
                  X0$1 += x;
                  Y0$1 += y;
                  ++Z0$1;
                }

                function centroidLineStart$1() {
                  centroidStream$1.point = centroidPointFirstLine;
                }

                function centroidPointFirstLine(x, y) {
                  centroidStream$1.point = centroidPointLine;
                  centroidPoint$1(x0$3 = x, y0$3 = y);
                }

                function centroidPointLine(x, y) {
                  var dx = x - x0$3, dy = y - y0$3, z = sqrt$1(dx * dx + dy * dy);
                  X1$1 += z * (x0$3 + x) / 2;
                  Y1$1 += z * (y0$3 + y) / 2;
                  Z1$1 += z;
                  centroidPoint$1(x0$3 = x, y0$3 = y);
                }

                function centroidLineEnd$1() {
                  centroidStream$1.point = centroidPoint$1;
                }

                function centroidRingStart$1() {
                  centroidStream$1.point = centroidPointFirstRing;
                }

                function centroidRingEnd$1() {
                  centroidPointRing(x00$1, y00$1);
                }

                function centroidPointFirstRing(x, y) {
                  centroidStream$1.point = centroidPointRing;
                  centroidPoint$1(x00$1 = x0$3 = x, y00$1 = y0$3 = y);
                }

                function centroidPointRing(x, y) {
                  var dx = x - x0$3,
                      dy = y - y0$3,
                      z = sqrt$1(dx * dx + dy * dy);

                  X1$1 += z * (x0$3 + x) / 2;
                  Y1$1 += z * (y0$3 + y) / 2;
                  Z1$1 += z;

                  z = y0$3 * x - x0$3 * y;
                  X2$1 += z * (x0$3 + x);
                  Y2$1 += z * (y0$3 + y);
                  Z2$1 += z * 3;
                  centroidPoint$1(x0$3 = x, y0$3 = y);
                }

                function PathContext(context) {
                  this._context = context;
                }

                PathContext.prototype = {
                  _radius: 4.5,
                  pointRadius: function(_) {
                    return this._radius = _, this;
                  },
                  polygonStart: function() {
                    this._line = 0;
                  },
                  polygonEnd: function() {
                    this._line = NaN;
                  },
                  lineStart: function() {
                    this._point = 0;
                  },
                  lineEnd: function() {
                    if (this._line === 0) this._context.closePath();
                    this._point = NaN;
                  },
                  point: function(x, y) {
                    switch (this._point) {
                      case 0: {
                        this._context.moveTo(x, y);
                        this._point = 1;
                        break;
                      }
                      case 1: {
                        this._context.lineTo(x, y);
                        break;
                      }
                      default: {
                        this._context.moveTo(x + this._radius, y);
                        this._context.arc(x, y, this._radius, 0, tau$4);
                        break;
                      }
                    }
                  },
                  result: noop$2
                };

                function PathString() {
                  this._string = [];
                }

                PathString.prototype = {
                  _circle: circle$2(4.5),
                  pointRadius: function(_) {
                    return this._circle = circle$2(_), this;
                  },
                  polygonStart: function() {
                    this._line = 0;
                  },
                  polygonEnd: function() {
                    this._line = NaN;
                  },
                  lineStart: function() {
                    this._point = 0;
                  },
                  lineEnd: function() {
                    if (this._line === 0) this._string.push("Z");
                    this._point = NaN;
                  },
                  point: function(x, y) {
                    switch (this._point) {
                      case 0: {
                        this._string.push("M", x, ",", y);
                        this._point = 1;
                        break;
                      }
                      case 1: {
                        this._string.push("L", x, ",", y);
                        break;
                      }
                      default: {
                        this._string.push("M", x, ",", y, this._circle);
                        break;
                      }
                    }
                  },
                  result: function() {
                    if (this._string.length) {
                      var result = this._string.join("");
                      this._string = [];
                      return result;
                    }
                  }
                };

                function circle$2(radius) {
                  return "m0," + radius
                      + "a" + radius + "," + radius + " 0 1,1 0," + -2 * radius
                      + "a" + radius + "," + radius + " 0 1,1 0," + 2 * radius
                      + "z";
                }

                var index$3 = function(projection, context) {
                  var pointRadius = 4.5,
                      projectionStream,
                      contextStream;

                  function path(object) {
                    if (object) {
                      if (typeof pointRadius === "function") contextStream.pointRadius(+pointRadius.apply(this, arguments));
                      geoStream(object, projectionStream(contextStream));
                    }
                    return contextStream.result();
                  }

                  path.area = function(object) {
                    geoStream(object, projectionStream(areaStream$1));
                    return areaStream$1.result();
                  };

                  path.bounds = function(object) {
                    geoStream(object, projectionStream(boundsStream$1));
                    return boundsStream$1.result();
                  };

                  path.centroid = function(object) {
                    geoStream(object, projectionStream(centroidStream$1));
                    return centroidStream$1.result();
                  };

                  path.projection = function(_) {
                    return arguments.length ? (projectionStream = (projection = _) == null ? identity$7 : _.stream, path) : projection;
                  };

                  path.context = function(_) {
                    if (!arguments.length) return context;
                    contextStream = (context = _) == null ? new PathString : new PathContext(_);
                    if (typeof pointRadius !== "function") contextStream.pointRadius(pointRadius);
                    return path;
                  };

                  path.pointRadius = function(_) {
                    if (!arguments.length) return pointRadius;
                    pointRadius = typeof _ === "function" ? _ : (contextStream.pointRadius(+_), +_);
                    return path;
                  };

                  return path.projection(projection).context(context);
                };

                var sum$2 = adder();

                var polygonContains = function(polygon, point) {
                  var lambda = point[0],
                      phi = point[1],
                      normal = [sin$1(lambda), -cos$1(lambda), 0],
                      angle = 0,
                      winding = 0;

                  sum$2.reset();

                  for (var i = 0, n = polygon.length; i < n; ++i) {
                    if (!(m = (ring = polygon[i]).length)) continue;
                    var ring,
                        m,
                        point0 = ring[m - 1],
                        lambda0 = point0[0],
                        phi0 = point0[1] / 2 + quarterPi,
                        sinPhi0 = sin$1(phi0),
                        cosPhi0 = cos$1(phi0);

                    for (var j = 0; j < m; ++j, lambda0 = lambda1, sinPhi0 = sinPhi1, cosPhi0 = cosPhi1, point0 = point1) {
                      var point1 = ring[j],
                          lambda1 = point1[0],
                          phi1 = point1[1] / 2 + quarterPi,
                          sinPhi1 = sin$1(phi1),
                          cosPhi1 = cos$1(phi1),
                          delta = lambda1 - lambda0,
                          sign$$1 = delta >= 0 ? 1 : -1,
                          absDelta = sign$$1 * delta,
                          antimeridian = absDelta > pi$4,
                          k = sinPhi0 * sinPhi1;

                      sum$2.add(atan2(k * sign$$1 * sin$1(absDelta), cosPhi0 * cosPhi1 + k * cos$1(absDelta)));
                      angle += antimeridian ? delta + sign$$1 * tau$4 : delta;

                      // Are the longitudes either side of the point’s meridian (lambda),
                      // and are the latitudes smaller than the parallel (phi)?
                      if (antimeridian ^ lambda0 >= lambda ^ lambda1 >= lambda) {
                        var arc = cartesianCross(cartesian(point0), cartesian(point1));
                        cartesianNormalizeInPlace(arc);
                        var intersection = cartesianCross(normal, arc);
                        cartesianNormalizeInPlace(intersection);
                        var phiArc = (antimeridian ^ delta >= 0 ? -1 : 1) * asin$1(intersection[2]);
                        if (phi > phiArc || phi === phiArc && (arc[0] || arc[1])) {
                          winding += antimeridian ^ delta >= 0 ? 1 : -1;
                        }
                      }
                    }
                  }

                  // First, determine whether the South pole is inside or outside:
                  //
                  // It is inside if:
                  // * the polygon winds around it in a clockwise direction.
                  // * the polygon does not (cumulatively) wind around it, but has a negative
                  //   (counter-clockwise) area.
                  //
                  // Second, count the (signed) number of times a segment crosses a lambda
                  // from the point to the South pole.  If it is zero, then the point is the
                  // same side as the South pole.

                  return (angle < -epsilon$4 || angle < epsilon$4 && sum$2 < -epsilon$4) ^ (winding & 1);
                };

                var clip = function(pointVisible, clipLine, interpolate, start) {
                  return function(rotate, sink) {
                    var line = clipLine(sink),
                        rotatedStart = rotate.invert(start[0], start[1]),
                        ringBuffer = clipBuffer(),
                        ringSink = clipLine(ringBuffer),
                        polygonStarted = false,
                        polygon,
                        segments,
                        ring;

                    var clip = {
                      point: point,
                      lineStart: lineStart,
                      lineEnd: lineEnd,
                      polygonStart: function() {
                        clip.point = pointRing;
                        clip.lineStart = ringStart;
                        clip.lineEnd = ringEnd;
                        segments = [];
                        polygon = [];
                      },
                      polygonEnd: function() {
                        clip.point = point;
                        clip.lineStart = lineStart;
                        clip.lineEnd = lineEnd;
                        segments = merge(segments);
                        var startInside = polygonContains(polygon, rotatedStart);
                        if (segments.length) {
                          if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
                          clipPolygon(segments, compareIntersection, startInside, interpolate, sink);
                        } else if (startInside) {
                          if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
                          sink.lineStart();
                          interpolate(null, null, 1, sink);
                          sink.lineEnd();
                        }
                        if (polygonStarted) sink.polygonEnd(), polygonStarted = false;
                        segments = polygon = null;
                      },
                      sphere: function() {
                        sink.polygonStart();
                        sink.lineStart();
                        interpolate(null, null, 1, sink);
                        sink.lineEnd();
                        sink.polygonEnd();
                      }
                    };

                    function point(lambda, phi) {
                      var point = rotate(lambda, phi);
                      if (pointVisible(lambda = point[0], phi = point[1])) sink.point(lambda, phi);
                    }

                    function pointLine(lambda, phi) {
                      var point = rotate(lambda, phi);
                      line.point(point[0], point[1]);
                    }

                    function lineStart() {
                      clip.point = pointLine;
                      line.lineStart();
                    }

                    function lineEnd() {
                      clip.point = point;
                      line.lineEnd();
                    }

                    function pointRing(lambda, phi) {
                      ring.push([lambda, phi]);
                      var point = rotate(lambda, phi);
                      ringSink.point(point[0], point[1]);
                    }

                    function ringStart() {
                      ringSink.lineStart();
                      ring = [];
                    }

                    function ringEnd() {
                      pointRing(ring[0][0], ring[0][1]);
                      ringSink.lineEnd();

                      var clean = ringSink.clean(),
                          ringSegments = ringBuffer.result(),
                          i, n = ringSegments.length, m,
                          segment,
                          point;

                      ring.pop();
                      polygon.push(ring);
                      ring = null;

                      if (!n) return;

                      // No intersections.
                      if (clean & 1) {
                        segment = ringSegments[0];
                        if ((m = segment.length - 1) > 0) {
                          if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
                          sink.lineStart();
                          for (i = 0; i < m; ++i) sink.point((point = segment[i])[0], point[1]);
                          sink.lineEnd();
                        }
                        return;
                      }

                      // Rejoin connected segments.
                      // TODO reuse ringBuffer.rejoin()?
                      if (n > 1 && clean & 2) ringSegments.push(ringSegments.pop().concat(ringSegments.shift()));

                      segments.push(ringSegments.filter(validSegment));
                    }

                    return clip;
                  };
                };

                function validSegment(segment) {
                  return segment.length > 1;
                }

                // Intersections are sorted along the clip edge. For both antimeridian cutting
                // and circle clipping, the same comparison is used.
                function compareIntersection(a, b) {
                  return ((a = a.x)[0] < 0 ? a[1] - halfPi$3 - epsilon$4 : halfPi$3 - a[1])
                       - ((b = b.x)[0] < 0 ? b[1] - halfPi$3 - epsilon$4 : halfPi$3 - b[1]);
                }

                var clipAntimeridian = clip(
                  function() { return true; },
                  clipAntimeridianLine,
                  clipAntimeridianInterpolate,
                  [-pi$4, -halfPi$3]
                );

                // Takes a line and cuts into visible segments. Return values: 0 - there were
                // intersections or the line was empty; 1 - no intersections; 2 - there were
                // intersections, and the first and last segments should be rejoined.
                function clipAntimeridianLine(stream) {
                  var lambda0 = NaN,
                      phi0 = NaN,
                      sign0 = NaN,
                      clean; // no intersections

                  return {
                    lineStart: function() {
                      stream.lineStart();
                      clean = 1;
                    },
                    point: function(lambda1, phi1) {
                      var sign1 = lambda1 > 0 ? pi$4 : -pi$4,
                          delta = abs(lambda1 - lambda0);
                      if (abs(delta - pi$4) < epsilon$4) { // line crosses a pole
                        stream.point(lambda0, phi0 = (phi0 + phi1) / 2 > 0 ? halfPi$3 : -halfPi$3);
                        stream.point(sign0, phi0);
                        stream.lineEnd();
                        stream.lineStart();
                        stream.point(sign1, phi0);
                        stream.point(lambda1, phi0);
                        clean = 0;
                      } else if (sign0 !== sign1 && delta >= pi$4) { // line crosses antimeridian
                        if (abs(lambda0 - sign0) < epsilon$4) lambda0 -= sign0 * epsilon$4; // handle degeneracies
                        if (abs(lambda1 - sign1) < epsilon$4) lambda1 -= sign1 * epsilon$4;
                        phi0 = clipAntimeridianIntersect(lambda0, phi0, lambda1, phi1);
                        stream.point(sign0, phi0);
                        stream.lineEnd();
                        stream.lineStart();
                        stream.point(sign1, phi0);
                        clean = 0;
                      }
                      stream.point(lambda0 = lambda1, phi0 = phi1);
                      sign0 = sign1;
                    },
                    lineEnd: function() {
                      stream.lineEnd();
                      lambda0 = phi0 = NaN;
                    },
                    clean: function() {
                      return 2 - clean; // if intersections, rejoin first and last segments
                    }
                  };
                }

                function clipAntimeridianIntersect(lambda0, phi0, lambda1, phi1) {
                  var cosPhi0,
                      cosPhi1,
                      sinLambda0Lambda1 = sin$1(lambda0 - lambda1);
                  return abs(sinLambda0Lambda1) > epsilon$4
                      ? atan((sin$1(phi0) * (cosPhi1 = cos$1(phi1)) * sin$1(lambda1)
                          - sin$1(phi1) * (cosPhi0 = cos$1(phi0)) * sin$1(lambda0))
                          / (cosPhi0 * cosPhi1 * sinLambda0Lambda1))
                      : (phi0 + phi1) / 2;
                }

                function clipAntimeridianInterpolate(from, to, direction, stream) {
                  var phi;
                  if (from == null) {
                    phi = direction * halfPi$3;
                    stream.point(-pi$4, phi);
                    stream.point(0, phi);
                    stream.point(pi$4, phi);
                    stream.point(pi$4, 0);
                    stream.point(pi$4, -phi);
                    stream.point(0, -phi);
                    stream.point(-pi$4, -phi);
                    stream.point(-pi$4, 0);
                    stream.point(-pi$4, phi);
                  } else if (abs(from[0] - to[0]) > epsilon$4) {
                    var lambda = from[0] < to[0] ? pi$4 : -pi$4;
                    phi = direction * lambda / 2;
                    stream.point(-lambda, phi);
                    stream.point(0, phi);
                    stream.point(lambda, phi);
                  } else {
                    stream.point(to[0], to[1]);
                  }
                }

                var clipCircle = function(radius, delta) {
                  var cr = cos$1(radius),
                      smallRadius = cr > 0,
                      notHemisphere = abs(cr) > epsilon$4; // TODO optimise for this common case

                  function interpolate(from, to, direction, stream) {
                    circleStream(stream, radius, delta, direction, from, to);
                  }

                  function visible(lambda, phi) {
                    return cos$1(lambda) * cos$1(phi) > cr;
                  }

                  // Takes a line and cuts into visible segments. Return values used for polygon
                  // clipping: 0 - there were intersections or the line was empty; 1 - no
                  // intersections 2 - there were intersections, and the first and last segments
                  // should be rejoined.
                  function clipLine(stream) {
                    var point0, // previous point
                        c0, // code for previous point
                        v0, // visibility of previous point
                        v00, // visibility of first point
                        clean; // no intersections
                    return {
                      lineStart: function() {
                        v00 = v0 = false;
                        clean = 1;
                      },
                      point: function(lambda, phi) {
                        var point1 = [lambda, phi],
                            point2,
                            v = visible(lambda, phi),
                            c = smallRadius
                              ? v ? 0 : code(lambda, phi)
                              : v ? code(lambda + (lambda < 0 ? pi$4 : -pi$4), phi) : 0;
                        if (!point0 && (v00 = v0 = v)) stream.lineStart();
                        // Handle degeneracies.
                        // TODO ignore if not clipping polygons.
                        if (v !== v0) {
                          point2 = intersect(point0, point1);
                          if (pointEqual(point0, point2) || pointEqual(point1, point2)) {
                            point1[0] += epsilon$4;
                            point1[1] += epsilon$4;
                            v = visible(point1[0], point1[1]);
                          }
                        }
                        if (v !== v0) {
                          clean = 0;
                          if (v) {
                            // outside going in
                            stream.lineStart();
                            point2 = intersect(point1, point0);
                            stream.point(point2[0], point2[1]);
                          } else {
                            // inside going out
                            point2 = intersect(point0, point1);
                            stream.point(point2[0], point2[1]);
                            stream.lineEnd();
                          }
                          point0 = point2;
                        } else if (notHemisphere && point0 && smallRadius ^ v) {
                          var t;
                          // If the codes for two points are different, or are both zero,
                          // and there this segment intersects with the small circle.
                          if (!(c & c0) && (t = intersect(point1, point0, true))) {
                            clean = 0;
                            if (smallRadius) {
                              stream.lineStart();
                              stream.point(t[0][0], t[0][1]);
                              stream.point(t[1][0], t[1][1]);
                              stream.lineEnd();
                            } else {
                              stream.point(t[1][0], t[1][1]);
                              stream.lineEnd();
                              stream.lineStart();
                              stream.point(t[0][0], t[0][1]);
                            }
                          }
                        }
                        if (v && (!point0 || !pointEqual(point0, point1))) {
                          stream.point(point1[0], point1[1]);
                        }
                        point0 = point1, v0 = v, c0 = c;
                      },
                      lineEnd: function() {
                        if (v0) stream.lineEnd();
                        point0 = null;
                      },
                      // Rejoin first and last segments if there were intersections and the first
                      // and last points were visible.
                      clean: function() {
                        return clean | ((v00 && v0) << 1);
                      }
                    };
                  }

                  // Intersects the great circle between a and b with the clip circle.
                  function intersect(a, b, two) {
                    var pa = cartesian(a),
                        pb = cartesian(b);

                    // We have two planes, n1.p = d1 and n2.p = d2.
                    // Find intersection line p(t) = c1 n1 + c2 n2 + t (n1 ⨯ n2).
                    var n1 = [1, 0, 0], // normal
                        n2 = cartesianCross(pa, pb),
                        n2n2 = cartesianDot(n2, n2),
                        n1n2 = n2[0], // cartesianDot(n1, n2),
                        determinant = n2n2 - n1n2 * n1n2;

                    // Two polar points.
                    if (!determinant) return !two && a;

                    var c1 =  cr * n2n2 / determinant,
                        c2 = -cr * n1n2 / determinant,
                        n1xn2 = cartesianCross(n1, n2),
                        A = cartesianScale(n1, c1),
                        B = cartesianScale(n2, c2);
                    cartesianAddInPlace(A, B);

                    // Solve |p(t)|^2 = 1.
                    var u = n1xn2,
                        w = cartesianDot(A, u),
                        uu = cartesianDot(u, u),
                        t2 = w * w - uu * (cartesianDot(A, A) - 1);

                    if (t2 < 0) return;

                    var t = sqrt$1(t2),
                        q = cartesianScale(u, (-w - t) / uu);
                    cartesianAddInPlace(q, A);
                    q = spherical(q);

                    if (!two) return q;

                    // Two intersection points.
                    var lambda0 = a[0],
                        lambda1 = b[0],
                        phi0 = a[1],
                        phi1 = b[1],
                        z;

                    if (lambda1 < lambda0) z = lambda0, lambda0 = lambda1, lambda1 = z;

                    var delta = lambda1 - lambda0,
                        polar = abs(delta - pi$4) < epsilon$4,
                        meridian = polar || delta < epsilon$4;

                    if (!polar && phi1 < phi0) z = phi0, phi0 = phi1, phi1 = z;

                    // Check that the first point is between a and b.
                    if (meridian
                        ? polar
                          ? phi0 + phi1 > 0 ^ q[1] < (abs(q[0] - lambda0) < epsilon$4 ? phi0 : phi1)
                          : phi0 <= q[1] && q[1] <= phi1
                        : delta > pi$4 ^ (lambda0 <= q[0] && q[0] <= lambda1)) {
                      var q1 = cartesianScale(u, (-w + t) / uu);
                      cartesianAddInPlace(q1, A);
                      return [q, spherical(q1)];
                    }
                  }

                  // Generates a 4-bit vector representing the location of a point relative to
                  // the small circle's bounding box.
                  function code(lambda, phi) {
                    var r = smallRadius ? radius : pi$4 - radius,
                        code = 0;
                    if (lambda < -r) code |= 1; // left
                    else if (lambda > r) code |= 2; // right
                    if (phi < -r) code |= 4; // below
                    else if (phi > r) code |= 8; // above
                    return code;
                  }

                  return clip(visible, clipLine, interpolate, smallRadius ? [0, -radius] : [-pi$4, radius - pi$4]);
                };

                var transform$1 = function(methods) {
                  return {
                    stream: transformer(methods)
                  };
                };

                function transformer(methods) {
                  return function(stream) {
                    var s = new TransformStream;
                    for (var key in methods) s[key] = methods[key];
                    s.stream = stream;
                    return s;
                  };
                }

                function TransformStream() {}

                TransformStream.prototype = {
                  constructor: TransformStream,
                  point: function(x, y) { this.stream.point(x, y); },
                  sphere: function() { this.stream.sphere(); },
                  lineStart: function() { this.stream.lineStart(); },
                  lineEnd: function() { this.stream.lineEnd(); },
                  polygonStart: function() { this.stream.polygonStart(); },
                  polygonEnd: function() { this.stream.polygonEnd(); }
                };

                function fitExtent(projection, extent, object) {
                  var w = extent[1][0] - extent[0][0],
                      h = extent[1][1] - extent[0][1],
                      clip = projection.clipExtent && projection.clipExtent();

                  projection
                      .scale(150)
                      .translate([0, 0]);

                  if (clip != null) projection.clipExtent(null);

                  geoStream(object, projection.stream(boundsStream$1));

                  var b = boundsStream$1.result(),
                      k = Math.min(w / (b[1][0] - b[0][0]), h / (b[1][1] - b[0][1])),
                      x = +extent[0][0] + (w - k * (b[1][0] + b[0][0])) / 2,
                      y = +extent[0][1] + (h - k * (b[1][1] + b[0][1])) / 2;

                  if (clip != null) projection.clipExtent(clip);

                  return projection
                      .scale(k * 150)
                      .translate([x, y]);
                }

                function fitSize(projection, size, object) {
                  return fitExtent(projection, [[0, 0], size], object);
                }

                var maxDepth = 16;
                var cosMinDistance = cos$1(30 * radians); // cos(minimum angular distance)

                var resample = function(project, delta2) {
                  return +delta2 ? resample$1(project, delta2) : resampleNone(project);
                };

                function resampleNone(project) {
                  return transformer({
                    point: function(x, y) {
                      x = project(x, y);
                      this.stream.point(x[0], x[1]);
                    }
                  });
                }

                function resample$1(project, delta2) {

                  function resampleLineTo(x0, y0, lambda0, a0, b0, c0, x1, y1, lambda1, a1, b1, c1, depth, stream) {
                    var dx = x1 - x0,
                        dy = y1 - y0,
                        d2 = dx * dx + dy * dy;
                    if (d2 > 4 * delta2 && depth--) {
                      var a = a0 + a1,
                          b = b0 + b1,
                          c = c0 + c1,
                          m = sqrt$1(a * a + b * b + c * c),
                          phi2 = asin$1(c /= m),
                          lambda2 = abs(abs(c) - 1) < epsilon$4 || abs(lambda0 - lambda1) < epsilon$4 ? (lambda0 + lambda1) / 2 : atan2(b, a),
                          p = project(lambda2, phi2),
                          x2 = p[0],
                          y2 = p[1],
                          dx2 = x2 - x0,
                          dy2 = y2 - y0,
                          dz = dy * dx2 - dx * dy2;
                      if (dz * dz / d2 > delta2 // perpendicular projected distance
                          || abs((dx * dx2 + dy * dy2) / d2 - 0.5) > 0.3 // midpoint close to an end
                          || a0 * a1 + b0 * b1 + c0 * c1 < cosMinDistance) { // angular distance
                        resampleLineTo(x0, y0, lambda0, a0, b0, c0, x2, y2, lambda2, a /= m, b /= m, c, depth, stream);
                        stream.point(x2, y2);
                        resampleLineTo(x2, y2, lambda2, a, b, c, x1, y1, lambda1, a1, b1, c1, depth, stream);
                      }
                    }
                  }
                  return function(stream) {
                    var lambda00, x00, y00, a00, b00, c00, // first point
                        lambda0, x0, y0, a0, b0, c0; // previous point

                    var resampleStream = {
                      point: point,
                      lineStart: lineStart,
                      lineEnd: lineEnd,
                      polygonStart: function() { stream.polygonStart(); resampleStream.lineStart = ringStart; },
                      polygonEnd: function() { stream.polygonEnd(); resampleStream.lineStart = lineStart; }
                    };

                    function point(x, y) {
                      x = project(x, y);
                      stream.point(x[0], x[1]);
                    }

                    function lineStart() {
                      x0 = NaN;
                      resampleStream.point = linePoint;
                      stream.lineStart();
                    }

                    function linePoint(lambda, phi) {
                      var c = cartesian([lambda, phi]), p = project(lambda, phi);
                      resampleLineTo(x0, y0, lambda0, a0, b0, c0, x0 = p[0], y0 = p[1], lambda0 = lambda, a0 = c[0], b0 = c[1], c0 = c[2], maxDepth, stream);
                      stream.point(x0, y0);
                    }

                    function lineEnd() {
                      resampleStream.point = point;
                      stream.lineEnd();
                    }

                    function ringStart() {
                      lineStart();
                      resampleStream.point = ringPoint;
                      resampleStream.lineEnd = ringEnd;
                    }

                    function ringPoint(lambda, phi) {
                      linePoint(lambda00 = lambda, phi), x00 = x0, y00 = y0, a00 = a0, b00 = b0, c00 = c0;
                      resampleStream.point = linePoint;
                    }

                    function ringEnd() {
                      resampleLineTo(x0, y0, lambda0, a0, b0, c0, x00, y00, lambda00, a00, b00, c00, maxDepth, stream);
                      resampleStream.lineEnd = lineEnd;
                      lineEnd();
                    }

                    return resampleStream;
                  };
                }

                var transformRadians = transformer({
                  point: function(x, y) {
                    this.stream.point(x * radians, y * radians);
                  }
                });

                function projection(project) {
                  return projectionMutator(function() { return project; })();
                }

                function projectionMutator(projectAt) {
                  var project,
                      k = 150, // scale
                      x = 480, y = 250, // translate
                      dx, dy, lambda = 0, phi = 0, // center
                      deltaLambda = 0, deltaPhi = 0, deltaGamma = 0, rotate, projectRotate, // rotate
                      theta = null, preclip = clipAntimeridian, // clip angle
                      x0 = null, y0, x1, y1, postclip = identity$7, // clip extent
                      delta2 = 0.5, projectResample = resample(projectTransform, delta2), // precision
                      cache,
                      cacheStream;

                  function projection(point) {
                    point = projectRotate(point[0] * radians, point[1] * radians);
                    return [point[0] * k + dx, dy - point[1] * k];
                  }

                  function invert(point) {
                    point = projectRotate.invert((point[0] - dx) / k, (dy - point[1]) / k);
                    return point && [point[0] * degrees$1, point[1] * degrees$1];
                  }

                  function projectTransform(x, y) {
                    return x = project(x, y), [x[0] * k + dx, dy - x[1] * k];
                  }

                  projection.stream = function(stream) {
                    return cache && cacheStream === stream ? cache : cache = transformRadians(preclip(rotate, projectResample(postclip(cacheStream = stream))));
                  };

                  projection.clipAngle = function(_) {
                    return arguments.length ? (preclip = +_ ? clipCircle(theta = _ * radians, 6 * radians) : (theta = null, clipAntimeridian), reset()) : theta * degrees$1;
                  };

                  projection.clipExtent = function(_) {
                    return arguments.length ? (postclip = _ == null ? (x0 = y0 = x1 = y1 = null, identity$7) : clipExtent(x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reset()) : x0 == null ? null : [[x0, y0], [x1, y1]];
                  };

                  projection.scale = function(_) {
                    return arguments.length ? (k = +_, recenter()) : k;
                  };

                  projection.translate = function(_) {
                    return arguments.length ? (x = +_[0], y = +_[1], recenter()) : [x, y];
                  };

                  projection.center = function(_) {
                    return arguments.length ? (lambda = _[0] % 360 * radians, phi = _[1] % 360 * radians, recenter()) : [lambda * degrees$1, phi * degrees$1];
                  };

                  projection.rotate = function(_) {
                    return arguments.length ? (deltaLambda = _[0] % 360 * radians, deltaPhi = _[1] % 360 * radians, deltaGamma = _.length > 2 ? _[2] % 360 * radians : 0, recenter()) : [deltaLambda * degrees$1, deltaPhi * degrees$1, deltaGamma * degrees$1];
                  };

                  projection.precision = function(_) {
                    return arguments.length ? (projectResample = resample(projectTransform, delta2 = _ * _), reset()) : sqrt$1(delta2);
                  };

                  projection.fitExtent = function(extent, object) {
                    return fitExtent(projection, extent, object);
                  };

                  projection.fitSize = function(size, object) {
                    return fitSize(projection, size, object);
                  };

                  function recenter() {
                    projectRotate = compose(rotate = rotateRadians(deltaLambda, deltaPhi, deltaGamma), project);
                    var center = project(lambda, phi);
                    dx = x - center[0] * k;
                    dy = y + center[1] * k;
                    return reset();
                  }

                  function reset() {
                    cache = cacheStream = null;
                    return projection;
                  }

                  return function() {
                    project = projectAt.apply(this, arguments);
                    projection.invert = project.invert && invert;
                    return recenter();
                  };
                }

                function conicProjection(projectAt) {
                  var phi0 = 0,
                      phi1 = pi$4 / 3,
                      m = projectionMutator(projectAt),
                      p = m(phi0, phi1);

                  p.parallels = function(_) {
                    return arguments.length ? m(phi0 = _[0] * radians, phi1 = _[1] * radians) : [phi0 * degrees$1, phi1 * degrees$1];
                  };

                  return p;
                }

                function cylindricalEqualAreaRaw(phi0) {
                  var cosPhi0 = cos$1(phi0);

                  function forward(lambda, phi) {
                    return [lambda * cosPhi0, sin$1(phi) / cosPhi0];
                  }

                  forward.invert = function(x, y) {
                    return [x / cosPhi0, asin$1(y * cosPhi0)];
                  };

                  return forward;
                }

                function conicEqualAreaRaw(y0, y1) {
                  var sy0 = sin$1(y0), n = (sy0 + sin$1(y1)) / 2;

                  // Are the parallels symmetrical around the Equator?
                  if (abs(n) < epsilon$4) return cylindricalEqualAreaRaw(y0);

                  var c = 1 + sy0 * (2 * n - sy0), r0 = sqrt$1(c) / n;

                  function project(x, y) {
                    var r = sqrt$1(c - 2 * n * sin$1(y)) / n;
                    return [r * sin$1(x *= n), r0 - r * cos$1(x)];
                  }

                  project.invert = function(x, y) {
                    var r0y = r0 - y;
                    return [atan2(x, abs(r0y)) / n * sign$1(r0y), asin$1((c - (x * x + r0y * r0y) * n * n) / (2 * n))];
                  };

                  return project;
                }

                var conicEqualArea = function() {
                  return conicProjection(conicEqualAreaRaw)
                      .scale(155.424)
                      .center([0, 33.6442]);
                };

                var albers = function() {
                  return conicEqualArea()
                      .parallels([29.5, 45.5])
                      .scale(1070)
                      .translate([480, 250])
                      .rotate([96, 0])
                      .center([-0.6, 38.7]);
                };

                // The projections must have mutually exclusive clip regions on the sphere,
                // as this will avoid emitting interleaving lines and polygons.
                function multiplex(streams) {
                  var n = streams.length;
                  return {
                    point: function(x, y) { var i = -1; while (++i < n) streams[i].point(x, y); },
                    sphere: function() { var i = -1; while (++i < n) streams[i].sphere(); },
                    lineStart: function() { var i = -1; while (++i < n) streams[i].lineStart(); },
                    lineEnd: function() { var i = -1; while (++i < n) streams[i].lineEnd(); },
                    polygonStart: function() { var i = -1; while (++i < n) streams[i].polygonStart(); },
                    polygonEnd: function() { var i = -1; while (++i < n) streams[i].polygonEnd(); }
                  };
                }

                // A composite projection for the United States, configured by default for
                // 960×500. The projection also works quite well at 960×600 if you change the
                // scale to 1285 and adjust the translate accordingly. The set of standard
                // parallels for each region comes from USGS, which is published here:
                // http://egsc.usgs.gov/isb/pubs/MapProjections/projections.html#albers
                var albersUsa = function() {
                  var cache,
                      cacheStream,
                      lower48 = albers(), lower48Point,
                      alaska = conicEqualArea().rotate([154, 0]).center([-2, 58.5]).parallels([55, 65]), alaskaPoint, // EPSG:3338
                      hawaii = conicEqualArea().rotate([157, 0]).center([-3, 19.9]).parallels([8, 18]), hawaiiPoint, // ESRI:102007
                      point, pointStream = {point: function(x, y) { point = [x, y]; }};

                  function albersUsa(coordinates) {
                    var x = coordinates[0], y = coordinates[1];
                    return point = null,
                        (lower48Point.point(x, y), point)
                        || (alaskaPoint.point(x, y), point)
                        || (hawaiiPoint.point(x, y), point);
                  }

                  albersUsa.invert = function(coordinates) {
                    var k = lower48.scale(),
                        t = lower48.translate(),
                        x = (coordinates[0] - t[0]) / k,
                        y = (coordinates[1] - t[1]) / k;
                    return (y >= 0.120 && y < 0.234 && x >= -0.425 && x < -0.214 ? alaska
                        : y >= 0.166 && y < 0.234 && x >= -0.214 && x < -0.115 ? hawaii
                        : lower48).invert(coordinates);
                  };

                  albersUsa.stream = function(stream) {
                    return cache && cacheStream === stream ? cache : cache = multiplex([lower48.stream(cacheStream = stream), alaska.stream(stream), hawaii.stream(stream)]);
                  };

                  albersUsa.precision = function(_) {
                    if (!arguments.length) return lower48.precision();
                    lower48.precision(_), alaska.precision(_), hawaii.precision(_);
                    return reset();
                  };

                  albersUsa.scale = function(_) {
                    if (!arguments.length) return lower48.scale();
                    lower48.scale(_), alaska.scale(_ * 0.35), hawaii.scale(_);
                    return albersUsa.translate(lower48.translate());
                  };

                  albersUsa.translate = function(_) {
                    if (!arguments.length) return lower48.translate();
                    var k = lower48.scale(), x = +_[0], y = +_[1];

                    lower48Point = lower48
                        .translate(_)
                        .clipExtent([[x - 0.455 * k, y - 0.238 * k], [x + 0.455 * k, y + 0.238 * k]])
                        .stream(pointStream);

                    alaskaPoint = alaska
                        .translate([x - 0.307 * k, y + 0.201 * k])
                        .clipExtent([[x - 0.425 * k + epsilon$4, y + 0.120 * k + epsilon$4], [x - 0.214 * k - epsilon$4, y + 0.234 * k - epsilon$4]])
                        .stream(pointStream);

                    hawaiiPoint = hawaii
                        .translate([x - 0.205 * k, y + 0.212 * k])
                        .clipExtent([[x - 0.214 * k + epsilon$4, y + 0.166 * k + epsilon$4], [x - 0.115 * k - epsilon$4, y + 0.234 * k - epsilon$4]])
                        .stream(pointStream);

                    return reset();
                  };

                  albersUsa.fitExtent = function(extent, object) {
                    return fitExtent(albersUsa, extent, object);
                  };

                  albersUsa.fitSize = function(size, object) {
                    return fitSize(albersUsa, size, object);
                  };

                  function reset() {
                    cache = cacheStream = null;
                    return albersUsa;
                  }

                  return albersUsa.scale(1070);
                };

                function azimuthalRaw(scale) {
                  return function(x, y) {
                    var cx = cos$1(x),
                        cy = cos$1(y),
                        k = scale(cx * cy);
                    return [
                      k * cy * sin$1(x),
                      k * sin$1(y)
                    ];
                  }
                }

                function azimuthalInvert(angle) {
                  return function(x, y) {
                    var z = sqrt$1(x * x + y * y),
                        c = angle(z),
                        sc = sin$1(c),
                        cc = cos$1(c);
                    return [
                      atan2(x * sc, z * cc),
                      asin$1(z && y * sc / z)
                    ];
                  }
                }

                var azimuthalEqualAreaRaw = azimuthalRaw(function(cxcy) {
                  return sqrt$1(2 / (1 + cxcy));
                });

                azimuthalEqualAreaRaw.invert = azimuthalInvert(function(z) {
                  return 2 * asin$1(z / 2);
                });

                var azimuthalEqualArea = function() {
                  return projection(azimuthalEqualAreaRaw)
                      .scale(124.75)
                      .clipAngle(180 - 1e-3);
                };

                var azimuthalEquidistantRaw = azimuthalRaw(function(c) {
                  return (c = acos(c)) && c / sin$1(c);
                });

                azimuthalEquidistantRaw.invert = azimuthalInvert(function(z) {
                  return z;
                });

                var azimuthalEquidistant = function() {
                  return projection(azimuthalEquidistantRaw)
                      .scale(79.4188)
                      .clipAngle(180 - 1e-3);
                };

                function mercatorRaw(lambda, phi) {
                  return [lambda, log$1(tan((halfPi$3 + phi) / 2))];
                }

                mercatorRaw.invert = function(x, y) {
                  return [x, 2 * atan(exp(y)) - halfPi$3];
                };

                var mercator = function() {
                  return mercatorProjection(mercatorRaw)
                      .scale(961 / tau$4);
                };

                function mercatorProjection(project) {
                  var m = projection(project),
                      scale = m.scale,
                      translate = m.translate,
                      clipExtent = m.clipExtent,
                      clipAuto;

                  m.scale = function(_) {
                    return arguments.length ? (scale(_), clipAuto && m.clipExtent(null), m) : scale();
                  };

                  m.translate = function(_) {
                    return arguments.length ? (translate(_), clipAuto && m.clipExtent(null), m) : translate();
                  };

                  m.clipExtent = function(_) {
                    if (!arguments.length) return clipAuto ? null : clipExtent();
                    if (clipAuto = _ == null) {
                      var k = pi$4 * scale(),
                          t = translate();
                      _ = [[t[0] - k, t[1] - k], [t[0] + k, t[1] + k]];
                    }
                    clipExtent(_);
                    return m;
                  };

                  return m.clipExtent(null);
                }

                function tany(y) {
                  return tan((halfPi$3 + y) / 2);
                }

                function conicConformalRaw(y0, y1) {
                  var cy0 = cos$1(y0),
                      n = y0 === y1 ? sin$1(y0) : log$1(cy0 / cos$1(y1)) / log$1(tany(y1) / tany(y0)),
                      f = cy0 * pow$1(tany(y0), n) / n;

                  if (!n) return mercatorRaw;

                  function project(x, y) {
                    if (f > 0) { if (y < -halfPi$3 + epsilon$4) y = -halfPi$3 + epsilon$4; }
                    else { if (y > halfPi$3 - epsilon$4) y = halfPi$3 - epsilon$4; }
                    var r = f / pow$1(tany(y), n);
                    return [r * sin$1(n * x), f - r * cos$1(n * x)];
                  }

                  project.invert = function(x, y) {
                    var fy = f - y, r = sign$1(n) * sqrt$1(x * x + fy * fy);
                    return [atan2(x, abs(fy)) / n * sign$1(fy), 2 * atan(pow$1(f / r, 1 / n)) - halfPi$3];
                  };

                  return project;
                }

                var conicConformal = function() {
                  return conicProjection(conicConformalRaw)
                      .scale(109.5)
                      .parallels([30, 30]);
                };

                function equirectangularRaw(lambda, phi) {
                  return [lambda, phi];
                }

                equirectangularRaw.invert = equirectangularRaw;

                var equirectangular = function() {
                  return projection(equirectangularRaw)
                      .scale(152.63);
                };

                function conicEquidistantRaw(y0, y1) {
                  var cy0 = cos$1(y0),
                      n = y0 === y1 ? sin$1(y0) : (cy0 - cos$1(y1)) / (y1 - y0),
                      g = cy0 / n + y0;

                  if (abs(n) < epsilon$4) return equirectangularRaw;

                  function project(x, y) {
                    var gy = g - y, nx = n * x;
                    return [gy * sin$1(nx), g - gy * cos$1(nx)];
                  }

                  project.invert = function(x, y) {
                    var gy = g - y;
                    return [atan2(x, abs(gy)) / n * sign$1(gy), g - sign$1(n) * sqrt$1(x * x + gy * gy)];
                  };

                  return project;
                }

                var conicEquidistant = function() {
                  return conicProjection(conicEquidistantRaw)
                      .scale(131.154)
                      .center([0, 13.9389]);
                };

                function gnomonicRaw(x, y) {
                  var cy = cos$1(y), k = cos$1(x) * cy;
                  return [cy * sin$1(x) / k, sin$1(y) / k];
                }

                gnomonicRaw.invert = azimuthalInvert(atan);

                var gnomonic = function() {
                  return projection(gnomonicRaw)
                      .scale(144.049)
                      .clipAngle(60);
                };

                function scaleTranslate(k, tx, ty) {
                  return k === 1 && tx === 0 && ty === 0 ? identity$7 : transformer({
                    point: function(x, y) {
                      this.stream.point(x * k + tx, y * k + ty);
                    }
                  });
                }

                var identity$8 = function() {
                  var k = 1, tx = 0, ty = 0, transform = identity$7, // scale and translate
                      x0 = null, y0, x1, y1, clip = identity$7, // clip extent
                      cache,
                      cacheStream,
                      projection;

                  function reset() {
                    cache = cacheStream = null;
                    return projection;
                  }

                  return projection = {
                    stream: function(stream) {
                      return cache && cacheStream === stream ? cache : cache = transform(clip(cacheStream = stream));
                    },
                    clipExtent: function(_) {
                      return arguments.length ? (clip = _ == null ? (x0 = y0 = x1 = y1 = null, identity$7) : clipExtent(x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reset()) : x0 == null ? null : [[x0, y0], [x1, y1]];
                    },
                    scale: function(_) {
                      return arguments.length ? (transform = scaleTranslate(k = +_, tx, ty), reset()) : k;
                    },
                    translate: function(_) {
                      return arguments.length ? (transform = scaleTranslate(k, tx = +_[0], ty = +_[1]), reset()) : [tx, ty];
                    },
                    fitExtent: function(extent, object) {
                      return fitExtent(projection, extent, object);
                    },
                    fitSize: function(size, object) {
                      return fitSize(projection, size, object);
                    }
                  };
                };

                function orthographicRaw(x, y) {
                  return [cos$1(y) * sin$1(x), sin$1(y)];
                }

                orthographicRaw.invert = azimuthalInvert(asin$1);

                var orthographic = function() {
                  return projection(orthographicRaw)
                      .scale(249.5)
                      .clipAngle(90 + epsilon$4);
                };

                function stereographicRaw(x, y) {
                  var cy = cos$1(y), k = 1 + cos$1(x) * cy;
                  return [cy * sin$1(x) / k, sin$1(y) / k];
                }

                stereographicRaw.invert = azimuthalInvert(function(z) {
                  return 2 * atan(z);
                });

                var stereographic = function() {
                  return projection(stereographicRaw)
                      .scale(250)
                      .clipAngle(142);
                };

                function transverseMercatorRaw(lambda, phi) {
                  return [log$1(tan((halfPi$3 + phi) / 2)), -lambda];
                }

                transverseMercatorRaw.invert = function(x, y) {
                  return [-y, 2 * atan(exp(x)) - halfPi$3];
                };

                var transverseMercator = function() {
                  var m = mercatorProjection(transverseMercatorRaw),
                      center = m.center,
                      rotate = m.rotate;

                  m.center = function(_) {
                    return arguments.length ? center([-_[1], _[0]]) : (_ = center(), [_[1], -_[0]]);
                  };

                  m.rotate = function(_) {
                    return arguments.length ? rotate([_[0], _[1], _.length > 2 ? _[2] + 90 : 90]) : (_ = rotate(), [_[0], _[1], _[2] - 90]);
                  };

                  return rotate([0, 0, 90])
                      .scale(159.155);
                };

                exports.version = version;
                exports.bisect = bisectRight;
                exports.bisectRight = bisectRight;
                exports.bisectLeft = bisectLeft;
                exports.ascending = ascending;
                exports.bisector = bisector;
                exports.descending = descending;
                exports.deviation = deviation;
                exports.extent = extent;
                exports.histogram = histogram;
                exports.thresholdFreedmanDiaconis = freedmanDiaconis;
                exports.thresholdScott = scott;
                exports.thresholdSturges = sturges;
                exports.max = max;
                exports.mean = mean;
                exports.median = median;
                exports.merge = merge;
                exports.min = min;
                exports.pairs = pairs;
                exports.permute = permute;
                exports.quantile = threshold;
                exports.range = range;
                exports.scan = scan;
                exports.shuffle = shuffle;
                exports.sum = sum;
                exports.ticks = ticks;
                exports.tickStep = tickStep;
                exports.transpose = transpose;
                exports.variance = variance;
                exports.zip = zip;
                exports.entries = entries;
                exports.keys = keys;
                exports.values = values;
                exports.map = map$1;
                exports.set = set;
                exports.nest = nest;
                exports.randomUniform = uniform;
                exports.randomNormal = normal;
                exports.randomLogNormal = logNormal;
                exports.randomBates = bates;
                exports.randomIrwinHall = irwinHall;
                exports.randomExponential = exponential;
                exports.easeLinear = linear;
                exports.easeQuad = quadInOut;
                exports.easeQuadIn = quadIn;
                exports.easeQuadOut = quadOut;
                exports.easeQuadInOut = quadInOut;
                exports.easeCubic = cubicInOut;
                exports.easeCubicIn = cubicIn;
                exports.easeCubicOut = cubicOut;
                exports.easeCubicInOut = cubicInOut;
                exports.easePoly = polyInOut;
                exports.easePolyIn = polyIn;
                exports.easePolyOut = polyOut;
                exports.easePolyInOut = polyInOut;
                exports.easeSin = sinInOut;
                exports.easeSinIn = sinIn;
                exports.easeSinOut = sinOut;
                exports.easeSinInOut = sinInOut;
                exports.easeExp = expInOut;
                exports.easeExpIn = expIn;
                exports.easeExpOut = expOut;
                exports.easeExpInOut = expInOut;
                exports.easeCircle = circleInOut;
                exports.easeCircleIn = circleIn;
                exports.easeCircleOut = circleOut;
                exports.easeCircleInOut = circleInOut;
                exports.easeBounce = bounceOut;
                exports.easeBounceIn = bounceIn;
                exports.easeBounceOut = bounceOut;
                exports.easeBounceInOut = bounceInOut;
                exports.easeBack = backInOut;
                exports.easeBackIn = backIn;
                exports.easeBackOut = backOut;
                exports.easeBackInOut = backInOut;
                exports.easeElastic = elasticOut;
                exports.easeElasticIn = elasticIn;
                exports.easeElasticOut = elasticOut;
                exports.easeElasticInOut = elasticInOut;
                exports.polygonArea = area;
                exports.polygonCentroid = centroid;
                exports.polygonHull = hull;
                exports.polygonContains = contains;
                exports.polygonLength = length$1;
                exports.path = path;
                exports.quadtree = quadtree;
                exports.queue = queue;
                exports.arc = arc;
                exports.area = area$1;
                exports.line = line;
                exports.pie = pie;
                exports.radialArea = radialArea;
                exports.radialLine = radialLine$1;
                exports.symbol = symbol;
                exports.symbols = symbols;
                exports.symbolCircle = circle;
                exports.symbolCross = cross$1;
                exports.symbolDiamond = diamond;
                exports.symbolSquare = square;
                exports.symbolStar = star;
                exports.symbolTriangle = triangle;
                exports.symbolWye = wye;
                exports.curveBasisClosed = basisClosed;
                exports.curveBasisOpen = basisOpen;
                exports.curveBasis = basis;
                exports.curveBundle = bundle;
                exports.curveCardinalClosed = cardinalClosed;
                exports.curveCardinalOpen = cardinalOpen;
                exports.curveCardinal = cardinal;
                exports.curveCatmullRomClosed = catmullRomClosed;
                exports.curveCatmullRomOpen = catmullRomOpen;
                exports.curveCatmullRom = catmullRom;
                exports.curveLinearClosed = linearClosed;
                exports.curveLinear = curveLinear;
                exports.curveMonotoneX = monotoneX;
                exports.curveMonotoneY = monotoneY;
                exports.curveNatural = natural;
                exports.curveStep = step;
                exports.curveStepAfter = stepAfter;
                exports.curveStepBefore = stepBefore;
                exports.stack = stack;
                exports.stackOffsetExpand = expand;
                exports.stackOffsetNone = none;
                exports.stackOffsetSilhouette = silhouette;
                exports.stackOffsetWiggle = wiggle;
                exports.stackOrderAscending = ascending$1;
                exports.stackOrderDescending = descending$2;
                exports.stackOrderInsideOut = insideOut;
                exports.stackOrderNone = none$1;
                exports.stackOrderReverse = reverse;
                exports.color = color;
                exports.rgb = rgb;
                exports.hsl = hsl;
                exports.lab = lab;
                exports.hcl = hcl;
                exports.cubehelix = cubehelix;
                exports.interpolate = interpolate;
                exports.interpolateArray = array$1;
                exports.interpolateDate = date;
                exports.interpolateNumber = interpolateNumber;
                exports.interpolateObject = object;
                exports.interpolateRound = interpolateRound;
                exports.interpolateString = interpolateString;
                exports.interpolateTransformCss = interpolateTransformCss;
                exports.interpolateTransformSvg = interpolateTransformSvg;
                exports.interpolateZoom = interpolateZoom;
                exports.interpolateRgb = interpolateRgb;
                exports.interpolateRgbBasis = rgbBasis;
                exports.interpolateRgbBasisClosed = rgbBasisClosed;
                exports.interpolateHsl = hsl$2;
                exports.interpolateHslLong = hslLong;
                exports.interpolateLab = lab$1;
                exports.interpolateHcl = hcl$2;
                exports.interpolateHclLong = hclLong;
                exports.interpolateCubehelix = cubehelix$2;
                exports.interpolateCubehelixLong = cubehelixLong;
                exports.interpolateBasis = basis$2;
                exports.interpolateBasisClosed = basisClosed$1;
                exports.quantize = quantize;
                exports.dispatch = dispatch;
                exports.dsvFormat = dsv;
                exports.csvParse = csvParse;
                exports.csvParseRows = csvParseRows;
                exports.csvFormat = csvFormat;
                exports.csvFormatRows = csvFormatRows;
                exports.tsvParse = tsvParse;
                exports.tsvParseRows = tsvParseRows;
                exports.tsvFormat = tsvFormat;
                exports.tsvFormatRows = tsvFormatRows;
                exports.request = request;
                exports.html = html;
                exports.json = json;
                exports.text = text;
                exports.xml = xml;
                exports.csv = csv$1;
                exports.tsv = tsv$1;
                exports.now = now;
                exports.timer = timer;
                exports.timerFlush = timerFlush;
                exports.timeout = timeout$1;
                exports.interval = interval$1;
                exports.timeInterval = newInterval;
                exports.timeMillisecond = millisecond;
                exports.timeMilliseconds = milliseconds;
                exports.timeSecond = second;
                exports.timeSeconds = seconds;
                exports.timeMinute = minute;
                exports.timeMinutes = minutes;
                exports.timeHour = hour;
                exports.timeHours = hours;
                exports.timeDay = day;
                exports.timeDays = days;
                exports.timeWeek = sunday;
                exports.timeWeeks = sundays;
                exports.timeSunday = sunday;
                exports.timeSundays = sundays;
                exports.timeMonday = monday;
                exports.timeMondays = mondays;
                exports.timeTuesday = tuesday;
                exports.timeTuesdays = tuesdays;
                exports.timeWednesday = wednesday;
                exports.timeWednesdays = wednesdays;
                exports.timeThursday = thursday;
                exports.timeThursdays = thursdays;
                exports.timeFriday = friday;
                exports.timeFridays = fridays;
                exports.timeSaturday = saturday;
                exports.timeSaturdays = saturdays;
                exports.timeMonth = month;
                exports.timeMonths = months;
                exports.timeYear = year;
                exports.timeYears = years;
                exports.utcMillisecond = millisecond;
                exports.utcMilliseconds = milliseconds;
                exports.utcSecond = second;
                exports.utcSeconds = seconds;
                exports.utcMinute = utcMinute;
                exports.utcMinutes = utcMinutes;
                exports.utcHour = utcHour;
                exports.utcHours = utcHours;
                exports.utcDay = utcDay;
                exports.utcDays = utcDays;
                exports.utcWeek = utcSunday;
                exports.utcWeeks = utcSundays;
                exports.utcSunday = utcSunday;
                exports.utcSundays = utcSundays;
                exports.utcMonday = utcMonday;
                exports.utcMondays = utcMondays;
                exports.utcTuesday = utcTuesday;
                exports.utcTuesdays = utcTuesdays;
                exports.utcWednesday = utcWednesday;
                exports.utcWednesdays = utcWednesdays;
                exports.utcThursday = utcThursday;
                exports.utcThursdays = utcThursdays;
                exports.utcFriday = utcFriday;
                exports.utcFridays = utcFridays;
                exports.utcSaturday = utcSaturday;
                exports.utcSaturdays = utcSaturdays;
                exports.utcMonth = utcMonth;
                exports.utcMonths = utcMonths;
                exports.utcYear = utcYear;
                exports.utcYears = utcYears;
                exports.formatLocale = formatLocale;
                exports.formatDefaultLocale = defaultLocale;
                exports.formatSpecifier = formatSpecifier;
                exports.precisionFixed = precisionFixed;
                exports.precisionPrefix = precisionPrefix;
                exports.precisionRound = precisionRound;
                exports.isoFormat = formatIso;
                exports.isoParse = parseIso;
                exports.timeFormatLocale = formatLocale$1;
                exports.timeFormatDefaultLocale = defaultLocale$1;
                exports.scaleBand = band;
                exports.scalePoint = point$4;
                exports.scaleIdentity = identity$4;
                exports.scaleLinear = linear$2;
                exports.scaleLog = log;
                exports.scaleOrdinal = ordinal;
                exports.scaleImplicit = implicit;
                exports.scalePow = pow;
                exports.scaleSqrt = sqrt;
                exports.scaleQuantile = quantile$$1;
                exports.scaleQuantize = quantize$1;
                exports.scaleThreshold = threshold$1;
                exports.scaleTime = time;
                exports.scaleUtc = utcTime;
                exports.schemeCategory10 = category10;
                exports.schemeCategory20b = category20b;
                exports.schemeCategory20c = category20c;
                exports.schemeCategory20 = category20;
                exports.scaleSequential = sequential;
                exports.interpolateCubehelixDefault = cubehelix$3;
                exports.interpolateRainbow = rainbow$1;
                exports.interpolateWarm = warm;
                exports.interpolateCool = cool;
                exports.interpolateViridis = viridis;
                exports.interpolateMagma = magma;
                exports.interpolateInferno = inferno;
                exports.interpolatePlasma = plasma;
                exports.creator = creator;
                exports.customEvent = customEvent;
                exports.local = local;
                exports.matcher = matcher$1;
                exports.mouse = mouse;
                exports.namespace = namespace;
                exports.namespaces = namespaces;
                exports.select = select;
                exports.selectAll = selectAll;
                exports.selection = selection;
                exports.selector = selector;
                exports.selectorAll = selectorAll;
                exports.touch = touch;
                exports.touches = touches;
                exports.window = window;
                exports.active = active;
                exports.interrupt = interrupt;
                exports.transition = transition;
                exports.axisTop = axisTop;
                exports.axisRight = axisRight;
                exports.axisBottom = axisBottom;
                exports.axisLeft = axisLeft;
                exports.cluster = cluster;
                exports.hierarchy = hierarchy;
                exports.pack = index;
                exports.packSiblings = siblings;
                exports.packEnclose = enclose;
                exports.partition = partition;
                exports.stratify = stratify;
                exports.tree = tree;
                exports.treemap = index$1;
                exports.treemapBinary = binary;
                exports.treemapDice = treemapDice;
                exports.treemapSlice = treemapSlice;
                exports.treemapSliceDice = sliceDice;
                exports.treemapSquarify = squarify;
                exports.treemapResquarify = resquarify;
                exports.forceCenter = center$1;
                exports.forceCollide = collide;
                exports.forceLink = link;
                exports.forceManyBody = manyBody;
                exports.forceSimulation = simulation;
                exports.forceX = x$3;
                exports.forceY = y$3;
                exports.drag = drag;
                exports.dragDisable = dragDisable;
                exports.dragEnable = yesdrag;
                exports.voronoi = voronoi;
                exports.zoom = zoom;
                exports.zoomIdentity = identity$6;
                exports.zoomTransform = transform;
                exports.brush = brush;
                exports.brushX = brushX;
                exports.brushY = brushY;
                exports.brushSelection = brushSelection;
                exports.chord = chord;
                exports.ribbon = ribbon;
                exports.geoAlbers = albers;
                exports.geoAlbersUsa = albersUsa;
                exports.geoArea = area$2;
                exports.geoAzimuthalEqualArea = azimuthalEqualArea;
                exports.geoAzimuthalEqualAreaRaw = azimuthalEqualAreaRaw;
                exports.geoAzimuthalEquidistant = azimuthalEquidistant;
                exports.geoAzimuthalEquidistantRaw = azimuthalEquidistantRaw;
                exports.geoBounds = bounds;
                exports.geoCentroid = centroid$1;
                exports.geoCircle = circle$1;
                exports.geoClipExtent = extent$1;
                exports.geoConicConformal = conicConformal;
                exports.geoConicConformalRaw = conicConformalRaw;
                exports.geoConicEqualArea = conicEqualArea;
                exports.geoConicEqualAreaRaw = conicEqualAreaRaw;
                exports.geoConicEquidistant = conicEquidistant;
                exports.geoConicEquidistantRaw = conicEquidistantRaw;
                exports.geoDistance = distance;
                exports.geoEquirectangular = equirectangular;
                exports.geoEquirectangularRaw = equirectangularRaw;
                exports.geoGnomonic = gnomonic;
                exports.geoGnomonicRaw = gnomonicRaw;
                exports.geoGraticule = graticule;
                exports.geoGraticule10 = graticule10;
                exports.geoIdentity = identity$8;
                exports.geoInterpolate = interpolate$2;
                exports.geoLength = length$2;
                exports.geoMercator = mercator;
                exports.geoMercatorRaw = mercatorRaw;
                exports.geoOrthographic = orthographic;
                exports.geoOrthographicRaw = orthographicRaw;
                exports.geoPath = index$3;
                exports.geoProjection = projection;
                exports.geoProjectionMutator = projectionMutator;
                exports.geoRotation = rotation;
                exports.geoStereographic = stereographic;
                exports.geoStereographicRaw = stereographicRaw;
                exports.geoStream = geoStream;
                exports.geoTransform = transform$1;
                exports.geoTransverseMercator = transverseMercator;
                exports.geoTransverseMercatorRaw = transverseMercatorRaw;

                Object.defineProperty(exports, '__esModule', { value: true });

                })));


                //aigner: HERE IS WHERE IT ALL STARTS!!!
                },{}],2:[function(require,module,exports){
                    


                    
                var d3 = require('d3');

                var PULSE_DURATION = 700;
                var SUB_ANIM_DELAY = 200;
                var ACTIVE_COLOR = d3.rgb("seagreen");

                function Animation(xdsms, rootId, delay) {
                  this.rootId = rootId;
                  if (typeof (rootId) === 'undefined') {
                    this.rootId = 'root';
                  }
                  this.root = xdsms[this.rootId];
                  this.xdsms = xdsms;
                  this.duration = PULSE_DURATION;
                  this.initialDelay = delay || 0;
                }

                Animation.prototype._pulse = function(delay, toBeSelected, option) {
                  var sel = d3.select("svg." + this.rootId)
                              .selectAll(toBeSelected)
                              .transition().delay(delay);
                  if (option !== "out") {
                    sel = sel.transition().duration(200)
                            .style('stroke-width', '8px')
                            .style('stroke', ACTIVE_COLOR)
                            .style('fill', function(d) {
                              if (d.id) {
                                return ACTIVE_COLOR.brighter();
                              }});
                  }
                  if (option !== "in") {
                    sel.transition().duration(3 * PULSE_DURATION)
                            .style('stroke-width', null)
                            .style('stroke', null)
                            .style('fill', null);
                  }
                };

                Animation.prototype._animate = function() {
                  var self = this;
                  var delay = this.initialDelay;
                  var animDelay = SUB_ANIM_DELAY;
                  var graph = self.xdsms[self.rootId].graph;
                  
                  var title = d3.select("svg." + self.rootId).select("g.title");
                  title.select("text").transition().delay(delay).style("fill", ACTIVE_COLOR);
                  d3.select("svg." + self.rootId).select("rect.border")
                    .transition().delay(delay)
                      .style("stroke-width", '5px').duration(200)
                    .transition().duration(1000)
                      .style("stroke", 'black').style("stroke-width", '0px');

                  graph.nodesByStep.forEach(function(nodesAtStep, n, nodesByStep) {
                    var offsets = [];
                    nodesAtStep.forEach(function(nodeId) {
                      var elapsed = delay + n * PULSE_DURATION;
                      if (n > 0) {
                        nodesByStep[n-1].forEach(function(prevNodeId) { // eslint-disable-line space-infix-ops
                          var from = graph.idxOf(prevNodeId);
                          var to = graph.idxOf(nodeId);
                          self._pulse(elapsed,"polyline.link_" + from + "_" + to);
                        });
                      }
                      //aigner: Look for existing xdsms/Sub-xdsms. Only show those, which are expanded
                      var gnode = "g." + nodeId;
                      var nodeSel = d3.select("svg." + self.rootId).select(gnode);
                      var scnId = graph.getNode(nodeId).getScenarioId();
                      if (nodeSel.classed("mdo") && self.xdsms[scnId]) 
                      {
                          self._pulse(elapsed, gnode + " > rect", "in");
                          var anim = new Animation(self.xdsms, scnId, elapsed + animDelay);
                          var offset = anim._animate();
                          offsets.push(offset);
                          self._pulse(offset + elapsed + animDelay, gnode + " > rect", "out");
                      } 
                      else 
                      {
                          self._pulse(elapsed, gnode + " > rect");
                      }
                    }, this);

                    if (offsets.length > 0) {
                      delay += Math.max.apply(null, offsets);
                    }
                    delay += animDelay;
                  }, this);
                    
                  title.select("text").transition()
                    .delay(graph.nodesByStep.length * PULSE_DURATION + delay)
                    .style("fill", null);

                  return graph.nodesByStep.length * PULSE_DURATION;
                };

                Animation.prototype.run = function() {
                  this._animate();
                };

                module.exports = Animation;

                },{"d3":1}],3:[function(require,module,exports){
                var UID = "_U_";
                var MULTI_TYPE = "_multi";

                //aigner: Node() constructor additionally gets the "xdsm"
                function Node(xdsm, id, name, type, metadata) {
                    
                  var splitUndef = name.split("undefined: ")
                  if (splitUndef.length>1) {name=splitUndef[1]}
                  else {name=splitUndef[0]}
                  
                  if (typeof (name) === 'undefined') {
                    name = id;
                  }
                  if (typeof (type) === 'undefined') {
                    type = 'analysis';
                  }
                  this.xdsm = xdsm;
                  this.id = id;
                  this.name = name;
                  this.metadata = metadata;
                  this.isMulti = (type.search(/_multi$/) >= 0);
                  this.type = this.isMulti ?
                    type.substr(0, type.length - MULTI_TYPE.length) : type;
                }

                Node.prototype.isMdo = function() {
                  return this.type === "mdo";
                };

                Node.prototype.getScenarioId = function() {
                  if (this.isMdo()) {
                    var idxscn = this.name.indexOf("_scn-");
                    if (idxscn === -1) {
                      console.log("Warning: MDO Scenario not found. " +
                                  "Bad type or name for node: " + JSON.stringify(this));
                      return null;
                    }
                    return this.name.substr(idxscn + 1);
                  }
                  return null;
                };

                function Edge(from, to, name, row, col, isMulti) {
                  this.id = "link_" + from + "_" + to;
                  this.name = name;
                  this.row = row;
                  this.col = col;
                  this.iotype = row < col ? "in" : "out";
                  this.io = {
                    fromU: (from === UID),
                    toU: (to === UID)
                  };
                  this.from = from;
                  this.to = to;
                  this.isMulti = isMulti;
                }

                Edge.prototype.isIO = function() {
                  return this.io.fromU || this.io.toU;
                };

                //aigner: Function creates the xdsm graph
                function Graph(mdo, refname) {
                  this.nodes = [new Node(UID, UID, UID, "user",[])];
                  this.edges = [];
                  this.chains = [];
                  this.refname = refname || "";
                  
                  //aigner: New numbering due to new workflow definition in KADMOS (Old stuff commented out)
                  var numbering = Graph.new_number(mdo.workflow);
                  //var numbering = Graph.number(mdo.workflow);
                  var numPrefixes = numbering.toNum;
                  this.nodesByStep = numbering.toNode;

                  mdo.nodes.forEach(function(item) {
                    name = document.createElement("TEXTAREA");
                    name = numPrefixes[item.id] + ": " + item.name;
                    this.nodes.push(new Node(item.xdsm, item.id, name, item.type,item.metadata));    
                  }, this);

                  this.ids = this.nodes.map(function(elt) {
                    return elt.id;
                  });
                  
                  mdo.edges.forEach(function(item) {
                    var idA = this.idxOf(item.from);
                    var idB = this.idxOf(item.to);
                    
                    var isMulti = this.nodes[idA].isMulti || this.nodes[idB].isMulti;
                    this.edges.push(new Edge(item.from, item.to, item.name, idA, idB, isMulti));
                  }, this);

                  
                  //aigner: new chains with new workflow definition for KADMOS (Old stuff commented out)
                  this.chains = Graph.new_expand(mdo.workflow,mdo.nodes);
                  // var echain = Graph.expand(mdo.workflow); 
                  // echain.forEach(function(leafChain) {
                    // if (leafChain.length < 2) {
                      // throw new Error("Bad process chain (" + leafChain.length + "elt)");
                    // } else {
                      // this.chains.push([]);
                      // var ids = this.nodes.map(function(elt) {
                        // return elt.id;
                      // });
                      // leafChain.forEach(function(item, j) {
                        // if (j !== 0) {
                          // var idA = ids.indexOf(leafChain[j - 1]);
                          // if (idA < 0) {
                            // throw new Error("Process chain element (" +
                                            // leafChain[j - 1] + ") not found");
                          // }
                          // var idB = ids.indexOf(leafChain[j]);
                          // if (idB < 0) {
                            // throw new Error("Process chain element (" +
                                            // leafChain[j] + ") not found");
                          // }
                          // if (idA !== idB) {
                            // this.chains[this.chains.length - 1].push([idA, idB]);
                          // }
                        // }
                      // }, this);
                    // }
                  // }, this);
                  
                  
                }

                Graph.prototype.idxOf = function(nodeId) {
                  return this.ids.indexOf(nodeId);
                };
                Graph.prototype.getNode = function(nodeId) {
                  return this.nodes[this.ids.indexOf(nodeId)];
                };

                function _expand(workflow) {
                  var ret = [];
                  var prev;
                  workflow.forEach(function(item) {
                    if (item instanceof Array) {
                      if (item[0].hasOwnProperty('parallel')) {
                        if (prev) {
                          ret = ret.slice(0, ret.length - 1).concat(item[0].parallel.map(
                              function(elt) {
                                return [prev].concat(_expand([elt]), prev);
                              }));
                        } else {
                          throw new Error("Bad workflow structure : " +
                              "cannot parallel loop without previous starting point.");
                        }
                      } else if (prev) {
                        ret = ret.concat(_expand(item), prev);
                      } else {
                        ret = ret.concat(_expand(item));
                      }
                      prev = ret[ret.length - 1];
                    } else if (item.hasOwnProperty('parallel')) {
                      if (prev) {
                        ret = ret.slice(0, ret.length - 1).concat(
                            item.parallel.map(function(elt) {
                              return [prev].concat(_expand([elt]));
                            }));
                      } else {
                        ret = ret.concat(item.parallel.map(
                            function(elt) {
                              return _expand([elt]);
                            }));
                      }
                      prev = undefined;
                    } else {
                      var i = ret.length - 1;
                      var flagParallel = false;
                      while (i >= 0 && (ret[i] instanceof Array)) {
                        ret[i] = ret[i].concat(item);
                        i -= 1;
                        flagParallel = true;
                      }
                      if (!flagParallel) {
                        ret.push(item);
                      }
                      prev = item;
                    }
                  }, this);
                  return ret;
                }

                Graph.expand = function(item) {
                  var expanded = _expand(item);
                  var result = [];
                  var current = [];
                  expanded.forEach(function(elt) {
                    if (elt instanceof Array) {
                      if (current.length > 0) {
                        current.push(elt[0]);
                        result.push(current);
                        current = [];
                      }
                      result.push(elt);
                    } else {
                      if (result.length > 0 && current.length === 0) {
                        var lastChain = result[result.length - 1];
                        var lastElt = lastChain[lastChain.length - 1];
                        current.push(lastElt);
                      }
                      current.push(elt);
                    }
                  }, this);
                  if (current.length > 0) {
                    result.push(current);
                  }
                  return result;
                };

                Graph.new_expand = function(workflow,nodes) {
                    var ids = nodes.map(function(elt) {
                        return elt.id;
                    });
                    var result_tmp = [];
                    for (var i=0; i < workflow.length; i++)
                    {
                        var stepNumber = workflow[i].step_number
                        var edges = workflow[i].edges;
                        for (var j=0; j < edges.length; j++)
                        {
                            var fromNode = edges[j][0];
                            var toNode = edges[j][1];			
                            var fromId = ids.indexOf(fromNode)+1;
                            var toId = ids.indexOf(toNode)+1;
                            result_tmp.push([fromId,toId]);
                        }
                    }
                    var result = [];
                    result.push(result_tmp)
                    return result;
                };

                Graph.number = function(workflow, num) {
                  num = (typeof num === 'undefined') ? 0 : num;
                  var toNum = {};
                  var toNode = [];

                  function setStep(step, nodeId) {
                    if (step in toNode) {
                      toNode[step].push(nodeId);
                    } else {
                      toNode[step] = [nodeId];
                    }
                  }

                  function setNum(nodeId, beg, end) {
                    if (end === undefined) {
                      num = String(beg);
                      setStep(beg, nodeId);
                    } else {
                      num = end + "-" + beg;
                      setStep(end, nodeId);
                    }
                    if (nodeId in toNum) {
                      toNum[nodeId] += "," + num;
                    } else {
                      toNum[nodeId] = num;
                    }
                  }

                  function _number(wks, num) {
                    var ret = 0;
                    if (wks instanceof Array) {
                      if (wks.length === 0) {
                        ret = num;
                      } else if (wks.length === 1) {
                        ret = _number(wks[0], num);
                      } else {
                        var head = wks[0];
                        var tail = wks.slice(1);
                        var beg = _number(head, num);
                        if (tail[0] instanceof Array) {
                          var end = _number(tail[0], beg);
                          setNum(head, beg, end);
                          beg = end + 1;
                          tail.shift();
                        }
                        ret = _number(tail, beg);
                      }
                    } else if ((wks instanceof Object) && 'parallel' in wks) {
                      var nums = wks.parallel.map(function(branch) {
                        return _number(branch, num);
                      });
                      ret = Math.max.apply(null, nums);
                    } else {
                      setNum(wks, num);
                      ret = num + 1;
                    }
                    return ret;
                  }

                  _number(workflow, num);
                  // console.log('toNodes=', JSON.stringify(toNode));
                  // console.log('toNum=',JSON.stringify(toNum));
                  return {toNum: toNum, toNode: toNode};
                };

                //aigner: New numbering for the workflow nodes
                Graph.new_number = function(workflow, num) {
                    num = (typeof num === 'undefined') ? 0 : num;
                    var toNum = {};
                    var toNode = [];
                    
                    for (var i=0; i < workflow.length; i++)
                    {
                        //aigner: Number the nodes with respect to the defined process steps
                        //--> toNum
                        //##########################################
                        for (var j=0; j < workflow[i].process_step_blocks.length; j++)
                        {
                            var proc_id_to = workflow[i].process_step_blocks[j];
                            if (proc_id_to)
                            {

                                if (!toNum[proc_id_to])
                                {
                                    toNum[proc_id_to] = workflow[i].step_number;
                                }
                                else
                                {
                                    toNum[proc_id_to] += "," + workflow[i].step_number;
                                }
                            }
                        }
                        for (var j=0; j < workflow[i].converger_step_blocks.length; j++)
                        {
                            var conv_id_to = workflow[i].converger_step_blocks[j];
                            if (conv_id_to)
                            {
                                toNum[conv_id_to] += "," + workflow[i].step_number;
                                var stepID = parseInt(toNum[conv_id_to].split(',')[0])+1;
                                //aigner: CAUTION --> hard coded exception for coordinator
                                if (conv_id_to!="id_Coordinator"){toNum[conv_id_to] += "-" + stepID;}
                            }
                        }
                        //##########################################		
                        //--> toNode
                        //##########################################
                        var stepNumber = workflow[i].step_number
                        var nodeId;
                        if (stepNumber==0){nodeId = [workflow[i].process_step_blocks[0]];}
                        else
                        {
                            var nodeIds = [];
                            for (var j=0; j<workflow[i].edges.length ;j++)
                            {
                                nodeIds.push(workflow[i].edges[j][1]);
                            }
                            nodeId = nodeIds;
                        }
                        toNode[stepNumber] = nodeId;
                        //##########################################
                    }	
                    return {toNum: toNum, toNode: toNode};
                };

                module.exports = Graph;

                },{}],4:[function(require,module,exports){
                function Labelizer() {}

                Labelizer.strParse = function(str) {
                  if (str === "") {
                    return [{base: '', sub: undefined, sup: undefined}];
                  }

                  //console.log("STR-->")
                  //console.log(str);
                  //aigner: Space sign added
                  var lstr = str.split(',');
                  var underscores = /_/g;
                  var rg = /([0-9\-]+: )?([A-Za-z0-9\{\}\(\)\[\]\-\.]+)(_[A-Za-z0-9\-\._]+)?(\^.+)?/;

                  var res = lstr.map(function(s) {
                    var base;
                    var sub;
                    var sup;
                    
                    //aigner: Modification. xpath is split after each "/"
                    var s_split = s.split("/");
                    s = s_split[s_split.length-1];

                    if ((s.match(underscores) || []).length > 1) {
                      var mu = s.match(/(.+)^(.+)/);
                      if (mu) {
                        return {base: mu[1], sub: undefined, sup: mu[2]};
                      }
                      return {base: s, sub: undefined, sup: undefined};
                    }
                    var m = s.match(rg);
                    if (m) {
                      base = (m[1] ? m[1] : "") + m[2];
                      if (m[3]) {
                        sub = m[3].substring(1);
                      }
                      if (m[4]) {
                        sup = m[4].substring(1);
                      }
                    } else {
                      throw new Error("Labelizer.strParse: Can not parse '" + s + "'");
                    }
                    return {base: base, sub: sub, sup: sup};
                  }, this);
                 
                  return res;
                };

                Labelizer.labelize = function() {
                  var ellipsis = 0;

                  //aigner: createLabel modified. Hide variable names if too long.
                  function createLabel(selection) 
                  {
                    selection.each(function(d) {
                        //console.log("Labelize-->");
                        //console.log(d);
                      var tokens = Labelizer.strParse(d.name);
                      var text = selection.append("text");

                      var className = selection._groups[0][0].getAttribute("class");

                      if (className.includes("node"))
                      {
                        tokens.every(function(token, i, ary)
                        {
                            var offsetSub = 0;
                            var offsetSup = 0;
                            //aigner: If the node is too big, it will not be shown at first, only when hovering
                            if (ellipsis < 1 || i < 15) 
                            {
                                text.append("tspan").text(token.base);
                                if (token.sub) 
                                {
                                offsetSub = 10;
                                text.append("tspan")
                                  .attr("class", "sub")
                                  .attr("dy", offsetSub)
                                  .text(token.sub);
                                }
                                if (token.sup) {
                                    offsetSup = -10;
                                    text.append("tspan")
                                      .attr("class", "sup")
                                      .attr("dx", -5)
                                      .attr("dy", -offsetSub + offsetSup)
                                      .text(token.sup);
                                    offsetSub = 0;
                                }
                            } else 
                            {
                                text.append("tspan")
                                    .attr("dy", -offsetSub - offsetSup)
                                    .text("...");
                                selection.classed("ellipsized", true);
                                return false;
                            }
                            if (i < ary.length - 1) 
                            {
                                  text.append("tspan")
                                    .attr("dy", -offsetSub - offsetSup)
                                    .text(", ");
                            }
                            return true;
                        }, this);
                      }
                      else if(className.includes("edge"))
                      {	  
                            var offsetSub = 0;
                            var offsetSup = 0;
                            //aigner: If there are more than 5 variables in an edge, they are not shown!
                            tokens.every(function(token, i, ary)
                            {           			
                                if(d.io.fromU || d.from =="id_Coordinator"){text_tmp = "inp."}
                                else if(d.io.toU || d.to=="id_Coordinator"){text_tmp = "outp."}
                                else{text_tmp = "conn."}
                                //if (ary.length>1){text_tmp = text_tmp+"s"};
                                text.append("tspan")
                                .attr("dy", -offsetSub - offsetSup)
                                .text(ary.length + " " + text_tmp);                    
                                
                                selection.classed("ellipsized", true);
                                return false;
                            }, this);
                      }
                    });
                  }

                  createLabel.ellipsis = function(value) {  
                    if (!arguments.length) {
                      return ellipsis;
                    }
                    ellipsis = value;
                    return createLabel;
                  };

                  return createLabel;
                };

                Labelizer.tooltipize = function() {
                  var text = "";

                  function createTooltip(selection) {
                    var tokens = Labelizer.strParse(text);
                    var html = [];
                    tokens.forEach(function(token) {
                      var item = token.base;
                      if (token.sub) {
                        item += "<sub>" + token.sub + "</sub>";
                      }
                      if (token.sup) {
                        item += "<sup>" + token.sup + "</sup>";
                      }
                      html.push(item);
                    }, this);
                    selection.html(html.join(", "));
                  }

                  createTooltip.text = function(value) {
                    if (!arguments.length) {
                      return text;
                    }
                    text = value;
                    return createTooltip;
                  };

                  return createTooltip;
                };

                module.exports = Labelizer;

                },{}],5:[function(require,module,exports){
                var d3 = require('d3');
                var Labelizer = require('./labelizer.js');

                var WIDTH = 1000;
                var HEIGHT = 500;
                var X_ORIG = 70;
                var Y_ORIG = 20;
                var PADDING = 20;
                var CELL_W = 250;
                var CELL_H = 75;
                var MULTI_OFFSET = 3;

                function Cell(x, y, width, height) {
                  this.x = x;
                  this.y = y;
                  this.width = width;
                  this.height = height;
                }

                function Xdsm(graph, svgid, tooltip) {
                  this.graph = graph;
                  this.tooltip = tooltip;
                  this.svg = d3.select(".xdsm")
                               .append("svg")
                             .attr("width", WIDTH)
                             .attr("height", HEIGHT)
                             .attr("class", svgid);

                  this.grid = [];
                  this.nodes = [];
                  this.edges = [];
                }

                Xdsm.prototype.draw = function(graphName) {
                  var self = this;

                  if (self.graph.refname) {
                    var ref = self.svg.append('g').classed('title', true);

                    var text_tmp = self.graph.refname.replace(/\w/g, function(l){ return l.toUpperCase() })
                        
                    //ref.append("text").text(graphName);
                    var bbox = ref.nodes()[0].getBBox();
                    ref.insert("rect", "text")
                        .attr('x', bbox.x)
                        .attr('y', bbox.y)
                        .attr('width', bbox.width)
                        .attr('height', bbox.height);

                    ref.attr('transform',
                             'translate(' + X_ORIG + ',' + (Y_ORIG + bbox.height-10) + ')');
                  }

                  self.nodes = self._createTextGroup("node");
                  self.edges = self._createTextGroup("edge");

                  // Workflow
                  self._createWorkflow();

                  // Layout texts
                  self._layoutText(self.nodes);
                  self._layoutText(self.edges);

                  // Rectangles for nodes
                  self.nodes.each(function(d, i) {
                    var that = d3.select(this);
                    that.call(self._customRect.bind(self), d, i, 0);
                    if (d.isMulti) {
                      that.call(self._customRect.bind(self), d, i, 1 * Number(MULTI_OFFSET));
                      that.call(self._customRect.bind(self), d, i, 2 * Number(MULTI_OFFSET));
                    }
                  });

                  // Trapezium for edges
                  self.edges.each(function(d, i) {
                    var that = d3.select(this);
                    that.call(self._customTrapz.bind(self), d, i, 0);
                    if (d.isMulti) {
                      that.call(self._customTrapz.bind(self), d, i, 1 * Number(MULTI_OFFSET));
                      that.call(self._customTrapz.bind(self), d, i, 2 * Number(MULTI_OFFSET));
                    }
                  });

                  // Dataflow
                  self._createDataflow(self.edges);
                    
                  //aigner: set svg size
                  var w = CELL_W * (self.graph.nodes.length + 1);
                  var h = CELL_H * (self.graph.nodes.length + 1);
                  self.svg.attr("width", w).attr("height", h);

                  var bordercolor = 'black';
                  self.svg.append("rect")
                            .classed("border", true)
                            .attr("x", 4)
                            .attr("y", 4)
                            .attr("height", h - 4)
                            .attr("width", w - 4)
                            .style("stroke", bordercolor)
                            .style("fill", "none")
                            .style("stroke-width", 0);
                            
                  //aigner: PlayButton for animation
                  var playButton = self.svg.append("g").attr("class", "playButton")
                      .attr("transform", "translate("+ 10 +","+ 10 +")")
                      
                  playButton
                    .append("rect")
                      .attr("class", "playButton_rect")
                      .attr("width", 50)
                      .attr("height", 50)
                      .attr("rx", 4)
                      .style("fill", "#555555");
                      
                  playButton
                    .append("path")
                      .attr("class", "playButton_triangle")
                      .attr("d", "M15 10 L15 40 L35 25 Z")
                      .style("fill", "white");
                      
                  playButton.append("text")
                      .attr("y",20)
                      .attr("x",60)
                      .text("Play Workflow")

                  //aigner: Hide playbutton if there is no workflow process
                  if(self.graph.nodesByStep.length<1)
                  {
                      playButton.attr("visibility","hidden")
                  }
                  playButton.append("svg:title").text("Click to play workflow");
                };

                Xdsm.prototype._createTextGroup = function(kind) {
                  var self = this;

                  var group = self.svg.append('g').attr("class", kind + "s");

                  var textGroups =
                    group.selectAll("." + kind)
                      .data(this.graph[kind + "s"])
                    .enter()
                      .append("g").attr("class", function(d) {
                        var klass = kind === "node" ? d.type : "dataInter";
                        if (klass === "dataInter" && (d.isIO()||d.from=="id_Coordinator"||d.to=="id_Coordinator")) {
                          klass = "dataIO";
                        }
                        return d.id + " " + kind + " " + klass;
                      }).each(function() {
                        var labelize = Labelizer.labelize().ellipsis(5);
                        d3.select(this).call(labelize);
                      });

                  d3.selectAll(".ellipsized")
                    .on("mouseover", function(d) {
                        d3.select(this).style("cursor", "pointer")
                        self.tooltip.transition().duration(200).style("opacity", 0.9);
                        var pipeData = d.name.split(",");
                        var pipeVariables=[];
                        for (var i=0; i<pipeData.length; i++)
                        {
                            if (pipeData[i].includes("/"))
                            {
                                var splitPipeData = pipeData[i].split("/");
                                pipeVariables.push(splitPipeData[splitPipeData.length-1]);
                            }
                        }
                        

                        var pruned_pipeVars = {};
                        var tooltipText="";
                        pipeVariables.forEach(function(x) { pruned_pipeVars[x] = (pruned_pipeVars[x] || 0)+1; });
                        for(var keyName in pruned_pipeVars) {
                            var textTmp;
                            var value = pruned_pipeVars[keyName]
                            if (value>1){textTmp = String(keyName+"("+value+")")}
                            else{textTmp=String(keyName)}
                            if (tooltipText==""){tooltipText+=textTmp}
                            else{tooltipText+=","+textTmp}
                        }
                        
                        var tooltipize = Labelizer.tooltipize().text(tooltipText);
                        self.tooltip.call(tooltipize)
                          .style("width", "200px")
                          .style("left", (d3.event.pageX) + "px")
                          .style("top", (d3.event.pageY - 28) + "px");
                    })
                    .on("mouseout", function() {
                        self.tooltip.transition().duration(500).style("opacity", 0);
                    });

                  return textGroups;
                };

                Xdsm.prototype._createWorkflow = function() {
                  //  console.log(JSON.stringify(this.graph.chains));
                  var workflow = this.svg.insert("g", ":first-child")
                                    .attr("class", "workflow");
                  workflow.selectAll("g")
                    .data(this.graph.chains)
                  .enter()
                    .insert('g').attr("class", "workflow-chain")
                    .selectAll('polyline')
                      .data(function(d) { return d; })  // eslint-disable-line brace-style
                    .enter()
                      .append("polyline")
                        .attr("class", function(d) {
                          return "link_" + d[0] + "_" + d[1];
                        })
                        .attr("points", function(d) {
                          var w = CELL_W * Math.abs(d[0] - d[1]);
                          var h = CELL_H * Math.abs(d[0] - d[1]);
                          var points = [];
                          if (d[0] < d[1]) {
                            if (d[0] !== 0) {
                              points.push((-w) + ",0");
                            }
                            points.push("0,0");
                            if (d[1] !== 0) {
                              points.push("0," + h);
                            }
                          } else {
                            if (d[0] !== 0) {
                              points.push(w + ",0");
                            }
                            points.push("0,0");
                            if (d[1] !== 0) {
                              points.push("0," + (-h));
                            }
                          }
                          return points.join(" ");
                        })
                      .attr("transform", function(d) {
                        var max = Math.max(d[0], d[1]);
                        var min = Math.min(d[0], d[1]);
                        var w;
                        var h;
                        if (d[0] < d[1]) {
                          w = CELL_W * max + X_ORIG;
                          h = CELL_H * min + Y_ORIG;
                        } else {
                          w = CELL_W * min + X_ORIG;
                          h = CELL_H * max + Y_ORIG;
                        }
                        return "translate(" + (X_ORIG + w) + "," + (Y_ORIG + h) + ")";
                      });
                };

                Xdsm.prototype._createDataflow = function(edges) {
                  var dataflow = this.svg.insert("g", ":first-child")
                                   .attr("class", "dataflow");

                  edges.each(function(d, i) {
                    dataflow.insert("polyline", ":first-child")
                      .attr("points", function() {
                        var w = CELL_W * Math.abs(d.col - d.row);
                        var h = CELL_H * Math.abs(d.col - d.row);
                        var points = [];
                        if (d.iotype === "in") {
                          if (!d.io.fromU) {
                            points.push((-w) + ",0");
                          }
                          points.push("0,0");
                          if (!d.io.toU) {
                            points.push("0," + h);
                          }
                        } else {
                          if (!d.io.fromU) {
                            points.push(w + ",0");
                          }
                          points.push("0,0");
                          if (!d.io.toU) {
                            points.push("0," + (-h));
                          }
                        }
                        return points.join(" ");
                      }).attr("transform", function() {
                        var m = (d.col === undefined) ? i : d.col;
                        var n = (d.row === undefined) ? i : d.row;
                        var w = CELL_W * m + X_ORIG;
                        var h = CELL_H * n + Y_ORIG;
                        return "translate(" + (X_ORIG + w) + "," + (Y_ORIG + h) + ")";
                      });
                  });
                };

                Xdsm.prototype._layoutText = function(items) {
                  var grid = this.grid;
                  items.each(function(d, i) {
                    var item = d3.select(this);
                    if (grid[i] === undefined) {
                      grid[i] = new Array(items.length);
                    }
                    item.select("text").each(function(d, j) {
                      var that = d3.select(this);
                      var data = item.data()[0];
                      var m = (data.row === undefined) ? i : data.row;
                      var n = (data.col === undefined) ? i : data.col;
                      var bbox = that.nodes()[j].getBBox();
                      grid[m][n] = new Cell(-bbox.width / 2, 0, bbox.width, bbox.height);
                      that.attr("x", function() {
                        return grid[m][n].x;
                      }).attr("y", function() {
                        return grid[m][n].y;
                      }).attr("width", function() {
                        return grid[m][n].width;
                      }).attr("height", function() {
                        return grid[m][n].height;
                      });
                    });
                  });

                  items.attr("transform", function(d, i) {
                    var m = (d.col === undefined) ? i : d.col;
                    var n = (d.row === undefined) ? i : d.row;
                    var w = CELL_W * m + X_ORIG;
                    var h = CELL_H * n + Y_ORIG;
                    return "translate(" + (X_ORIG + w) + "," + (Y_ORIG + h) + ")";
                  });
                };

                Xdsm.prototype._customRect = function(node, d, i, offset) {
                  var grid = this.grid;
                  node.insert("rect", ":first-child").attr("x", function() {
                    return grid[i][i].x + offset - PADDING;
                  }).attr("y", function() {
                    return -grid[i][i].height * 2 / 3 - PADDING - offset;
                  }).attr("width", function() {
                    return grid[i][i].width + (PADDING * 2);
                  }).attr("height", function() {
                    return grid[i][i].height + (PADDING * 2);
                  }).attr("rx", function() {
                    var rounded = d.type === 'optimization' ||
                                  d.type === 'mda' ||
                                  d.type === 'doe' ||
                                  d.type === 'converger';
                    return rounded ? (grid[i][i].height + (PADDING * 2)) / 2 : 0;
                  }).attr("ry", function() {
                    var rounded = d.type === 'optimization' ||
                                  d.type === 'mda' ||
                                  d.type === 'doe' ||
                                  d.type === 'converger';
                    return rounded ? (grid[i][i].height + (PADDING * 2)) / 2 : 0;
                  });
                };

                Xdsm.prototype._customTrapz = function(edge, d, i, offset) {
                  var grid = this.grid;
                  edge.insert("polygon", ":first-child").attr("points", function(d) {
                    var pad = 5;
                    var w = grid[d.row][d.col].width;
                    var h = grid[d.row][d.col].height;
                    var topleft = (-pad - w / 2 + offset) + ", " +
                                  (-pad - h * 2 / 3 - offset);
                    var topright = (w / 2 + pad + offset + 5) + ", " +
                                   (-pad - h * 2 / 3 - offset);
                    var botright = (w / 2 + pad + offset - 5 + 5) + ", " +
                                   (pad + h / 3 - offset);
                    var botleft = (-pad - w / 2 + offset - 5) + ", " +
                                  (pad + h / 3 - offset);
                    var tpz = [topleft, topright, botright, botleft].join(" ");
                    return tpz;
                  });
                };

                module.exports = Xdsm;

                },{"./labelizer.js":4,"d3":1}],6:[function(require,module,exports){
                /*
                 * XDSMjs
                 * Copyright 2016 Rémi Lafage
                 */
                "use strict";




                var d3 = require('d3');
                var Graph = require('./src/graph');
                var Xdsm = require('./src/xdsm');
                var Animation = require('./src/animation');


                //aigner: NEW!
                //#####################################################################//
                //aigner: functions for drawing expand- and collapse-symbols
                function drawExpandSymbol(aCircle, line1, line2)
                {        
                     aCircle = aCircle
                        .attr("r", 10)
                        .style("stroke", "black")
                        .style("stroke-width", 2)
                        .style("fill", "#99CC00")
                        .style("fill-opacity", .6)
                    line1 = line1
                        .attr("x1", parseFloat(aCircle.attr("cx"))-5)
                        .attr("y1", parseFloat(aCircle.attr("cy")))
                        .attr("x2", parseFloat(aCircle.attr("cx"))+5)
                        .attr("y2", parseFloat(aCircle.attr("cy")))
                        .style("stroke", "black")
                        .style("stroke-width", 2);
                    line2 = line2
                        .attr("x1", parseFloat(aCircle.attr("cx")))
                        .attr("y1", parseFloat(aCircle.attr("cy"))-5)
                        .attr("x2", parseFloat(aCircle.attr("cx")))
                        .attr("y2", parseFloat(aCircle.attr("cy"))+5)
                        .style("stroke", "black")
                        .style("stroke-width", 2);
                }
                function drawRemoveSymbol(anXdsm, aCircle, aMinus)
                {        
                     var xOffset=150;
                     var yOffset=12;
                     aCircle = aCircle
                        .attr("cx", anXdsm.svg.attr("width")-xOffset)
                        .attr("cy", yOffset)
                        .attr("r", 10)
                        .classed("remCircle",true)
                    aMinus = aMinus
                        .attr("x1", anXdsm.svg.attr("width")-xOffset+5)
                        .attr("y1", yOffset)
                        .attr("x2", anXdsm.svg.attr("width")-xOffset-5)
                        .attr("y2", yOffset)
                        .classed("remMinus",true)
                }
                function drawTreeRemoveSymbol(aRemoveSymbol)
                {
                    aRemoveSymbol = aRemoveSymbol
                        .attr("class", "treeRemoveSymbol")
                        .attr("transform", "translate(38,12)")
                    var circle = aRemoveSymbol.append("circle");
                    var minus = aRemoveSymbol.append("line");
                    var cx = -20;
                    var cy = 12;
                    circle = circle
                        .attr("cx", cx+5)
                        .attr("cy", cy)
                        .attr("r", 10)
                        .classed("remCircle",true)
                    minus = minus
                        .attr("x1", cx)
                        .attr("y1", cy)
                        .attr("x2", cx+10)
                        .attr("y2", cy)
                        .classed("remMinus",true)
                    aRemoveSymbol
                        .on("mouseover", function(){
                            d3.select(this).style("cursor", "pointer")
                            circle.style("fill", "red").style("fill-opacity", .8);
                            })
                        .on("mouseout", function(){circle.style("fill", "red").style("fill-opacity", .6)})
                }

                //aigner: Update of the sub workflows
                function update_subXdsm(xdsms, refName)
                {
                    var playButton = d3.select(".xdsm").select("."+refName).select(".playButton");
                    var rect = playButton.select(".playButton_rect");
                    playButton.on("mouseover",function(){
                            d3.select(this).style("cursor", "pointer")
                            rect.style("fill","#3399FF");
                        })
                        .on("mousedown", function()
                        {
                            rect.style("fill","#3399FF");
                            var anim = new Animation(xdsms, refName);
                            anim.run();
                        })
                        .on("mouseup", function(){rect.style("fill","#4B4B4B");})
                        .on("mouseout", function(){rect.style("fill","#555555");})
                }
                //d3-context-menu for right-click-option
                d3.contextMenu = function (menu, openCallback) {

                    // create the div element that will hold the context menu
                    d3.selectAll('.d3-context-menu').data([1])
                        .enter()
                        .append('div')
                        .attr('class', 'd3-context-menu');

                    // close menu
                    d3.select('body').on('click.d3-context-menu', function() {
                        d3.select('.d3-context-menu').style('display', 'none');
                    });

                    // this gets executed when a contextmenu event occurs
                    return function(data, index) {	
                        var elm = this;

                        d3.selectAll('.d3-context-menu').html('');
                        var list = d3.selectAll('.d3-context-menu').append('ul');
                            list.selectAll('li').data(menu).enter()
                            .append('li')
                            .html(function(d) {
                                return d.title;
                            })
                            .on('mousedown', function(d, i) {
                                d.onMouseDown(elm, data, index);
                            })
                            .on('mouseup', function(d, i) {
                                d.onMouseUp(elm, data, index);
                                d3.select('.d3-context-menu').style('display', 'none');
                            })
                            .on('mouseenter',function(d,i){
                                d.onMouseOver(elm,data,index);
                                if(d.childrenItems.length>0 )
                                     {
                                      d3.select(this).selectAll("ul").remove(); 
                                      d3.select(this)
                                        .append("ul")
                                        .selectAll("li")
                                           .data(d.childrenItems)
                                            .enter().append("li")
                                              .text(function(d) { return d.title; })
                                         .on("mouseenter", function(d,i){
                                                d.onMouseOver(elm,data,index);
                                            })
                                         .on('click',  function(d, i) {
                                                d.onMouseClick(elm, d, index);
                                            })
                                         .on('mouseleave',function(d,i){
                                            
                                            });
                                     }
                                 else
                                     return false;
                            })
                            .on('mouseleave',function(d,i){
                                d3.select(this).selectAll("ul").style('display', 'none')                  
                            });
                        
                          

                        // the openCallback allows an action to fire before the menu is displayed
                        // an example usage would be closing a tooltip
                        if (openCallback) openCallback(data, index);

                        // display context menu
                        d3.select('.d3-context-menu')
                            .style('left', (d3.event.pageX - 2) + 'px')
                            .style('top', (d3.event.pageY - 2) + 'px')
                            .style('display', 'block');

                        d3.event.preventDefault();
                    };
                };
                //aigner: Move to front function
                d3.selection.prototype.moveToFront = function() {  
                  return this.each(function(){
                    this.parentNode.appendChild(this);
                  });
                };
                //aigner: Include function
                function include(arr,obj) {
                        return (arr.indexOf(obj) != -1);
                }

                //aigner: Function creates a table
                function tabulate(aTable,data,columns) {
                    var thead = aTable.append('thead');
                    var	tbody = aTable.append('tbody');  

                    // create a row for each object in the data
                    var rows = tbody.selectAll('tr')
                      .data(data)
                      .enter()
                      .append('tr');

                    // create a cell in each row for each column
                    var cells = rows.selectAll('td')
                      .data(function (row) {
                        return columns.map(function (column) {
                          return {column: column, value: row[column]};
                        });
                      })
                      .enter()
                      .append('td')
                        .html(function (d) { return d.value; });

                    return aTable;
                }

                function loader(config) {
                  return function() {
                    var radius = Math.min(config.width, config.height) / 2;
                    var tau = 2 * Math.PI;

                    var arc = d3.svg.arc()
                            .innerRadius(radius*0.5)
                            .outerRadius(radius*0.9)
                            .startAngle(0);

                    var svg = d3.select(config.container).append("svg")
                        .attr("id", config.id)
                        .attr("width", config.width)
                        .attr("height", config.height)
                      .append("g")
                        .attr("transform", "translate(" + config.width / 2 + "," + config.height / 2 + ")")

                    var background = svg.append("path")
                            .datum({endAngle: 0.33*tau})
                            .style("fill", "#4D4D4D")
                            .attr("d", arc)
                            .call(spin, 1500)

                    function spin(selection, duration) {
                        selection.transition()
                            .ease("linear")
                            .duration(duration)
                            .attrTween("transform", function() {
                                return d3.interpolateString("rotate(0)", "rotate(360)");
                            });

                        setTimeout(function() { spin(selection, duration); }, duration);
                    }

                    function transitionFunction(path) {
                        path.transition()
                            .duration(7500)
                            .attrTween("stroke-dasharray", tweenDash)
                            .each("end", function() { d3.select(this).call(transition); });
                    }

                  };
                }


                var myLoader = loader({width: 960, height: 500, container: "#loader_container", id: "loader"});
                
                //aigner: NEW!
                //aigner: Here, the data is read and the XDSM is created
                //#####################################################################//
                function startDataModel(data) 
                {				                                  
                    d3.select("body").append("div").attr("class","modelViewerDiv")	
                    //################################################################################################//	
                    var headerDiv = d3.select(".modelViewerDiv").append("div").attr("class","panel panel-primary")
                    headerDiv.append("div").attr("class","panel-heading text-center")
                        .append("h3")
                        .attr("class","panel-title")
                        .style("font-family","Arial")
                        .style("font-size","20pt")
                        .text("VISTOMS Data Model Viewer")
                    //################################################################################################//	
                    
                    
                    //aigner: Data Model Expand Button
                    //##########################################################
                    var dataModelDiv = d3.select(".modelViewerDiv").append("div").attr("class","dataModelDiv").attr("transform","translate(10,0)")
                    var ul = dataModelDiv.append("ul")
                    var dropdown1 = ul.append("li").on("mouseover", function(){d3.select(this).style("cursor", "default")})
                    dropdown1.append("img").attr("src",fileReference.AGILE_Icon)
                        .attr("align","left")
                        .style("margin-left","6px")
                        .style("margin-right","-10px")
                        .style("margin-top","10px")
                        .style("margin-bottom","0px")
                        .attr("height","20")
                        .attr("width","20")
                    dropdown1.append("a").text("View Data Model")
                    dropdown1.on("click", function()
                    {		
                        showFullTree()
                    })
                    
                    //aigner: Set width of the div, so the VISTOMS dropdown (in the top of the page) still works
                    dataModelDiv.style("width", String(dropdown1.node().getBoundingClientRect().width+20)+"px")
                    //##########################################################
                    
                    //aigner: Tree option menu to select which kind of tree view the user wants to see
                    //#####################################################################//
                    var emptyArray;
                    function showFullTree()
                    {
                        //expandSymbolDiv.remove();
                        var treeLayoutdiv = d3.select(".modelViewerDiv").append("div").attr("class","treeDiv")
                                                        .style("left",(d3.event.pageX) + "px")
                                                        .style("top",(d3.event.pageY - 28) + "px")
                                                        .style("position", "absolute")
                        var treeLayoutSVG = treeLayoutdiv.append("svg").attr("class","treeLayoutSVG")
                        var treeLayout = treeLayoutSVG.append("g").attr("class","treeLayout");
                        var name = data.modelName;
                        maketreeLayout(emptyArray, treeLayout, treeLayoutSVG, treeLayoutdiv, name);
                        //Remove Symbol is created
                        var removeSymbol = treeLayout.append("g");
                        drawTreeRemoveSymbol(removeSymbol);
                        removeSymbol.on("mousedown", function(d)
                        {
                            treeLayoutdiv.remove();
                        })
                    }
                    //#####################################################################//

                    
                        
                    //aigner: General functions for tree layout
                    //##############################################################
                    //Function to prune the tree according to list of xPaths that are actually there
                    function prune_tree(aPipeData,aTreeData,direction="none")
                    {
                        //First, clean up pipeData if necessary
                        var cleanPipeData = aPipeData.split(",")
                        var index = cleanPipeData.indexOf("");
                        if (index > -1) {cleanPipeData.splice(index, 1);}
                        var firstEl = cleanPipeData[0].split("/")[1]
                        for (var i=0; i < aTreeData.length; ++i) 
                        {
                            var treeElement = aTreeData[i];
                            var relevant_xPath = "/"+firstEl+treeElement.xPath.split(firstEl)[1]
                            if(cleanPipeData.indexOf(relevant_xPath)<=-1)
                            {
                                aTreeData.splice(i,1);
                                i--;
                            }
                            else
                            {
                                if (direction=="in")
                                {
                                    aTreeData[i].pipeLineIn = true;
                                }
                                else if (direction=="out")
                                {
                                    aTreeData[i].pipeLineOut = true;
                                }
                            }
                        }
                    }
                    
                    function childExists(name, children)
                    {
                        var exists = false
                        children.forEach(function(child)
                        {
                            if (child.name == name)
                            {
                                exists = true;
                            }
                        })
                        return exists;
                    }
                    
                    //Function to create the tree layout by appending children to the layout
                    function appendChildren(anElement, aParent, xPath_list)
                    {
                        if (xPath_list.length > 0)
                        {
                            //If element has no children yet, initialize children array
                            if (!aParent.children){aParent.children = [];}
                            //Create a new child element, if it does not exist yet
                            if (!childExists(xPath_list[0], aParent.children))
                            {
                                //Create a new child object
                                var newChild = {level: aParent.level+1, name: xPath_list[0], type: "variable", xPath: aParent.xPath+"/"+xPath_list[0]};
                                if (anElement.pipeLineIn){newChild.pipeLineIn=true}
                                if (anElement.pipeLineOut){newChild.pipeLineOut=true}
                                aParent.children.push(newChild);
                            }
                            aParent.children.forEach(function(aChild)
                            {
                                if (xPath_list[0] == aChild.name)
                                {
                                    let newXPath_list = JSON.parse(JSON.stringify(xPath_list));
                                    newXPath_list.shift();
                                    appendChildren(anElement, aChild, newXPath_list)
                                }
                            })
                        }
                        else
                        {
                            aParent.value = anElement.value;
                        }
                    }
                    
                    //function builds tree layout from xPaths of the elements
                    function buildTree(root, aTreeData)
                    {
                        aTreeData.forEach(function(treeElement)
                        {
                            var xPath_split = treeElement.xPath.split("/");
                            var index = xPath_split.indexOf("");
                            if (index > -1) {xPath_split.splice(index, 1);}
                            root.level = 0
                            root.name = xPath_split[0]
                            root.xPath = "/"+xPath_split[0]
                            <!-- console.log("####################") -->
                            <!-- console.log(treeElement.xPath) -->
                            let newXPath_split = JSON.parse(JSON.stringify(xPath_split));
                            newXPath_split.shift();
                            appendChildren(treeElement, root, newXPath_split)
                            <!-- console.log("DONE!") -->
                            <!-- console.log("####################") -->
                        })
                    }
                    //##############################################################
                    
                    
                    function maketreeLayout(pipeData, layout, svg, div, aName)
                    {			
                        //aigner: here the tree layout begins
                        //Drag Function for treeLayout
                        var xPos_init = d3.event.pageX - 2;
                        var yPos_init = d3.event.pageY - 2;
                        var xOffset_tmp;
                        var yOffset_tmp;
                        var drag = div.call(d3.drag()
                            .on("start", dragstarted)
                            .on("drag", dragged)
                            .on("end", dragended));
                        function dragstarted() {
                          d3.select(this).style("cursor", "grabbing")
                          d3.select(this).raise().classed("active", true);
                          xOffset_tmp = xPos_init-d3.event.x;
                          yOffset_tmp = yPos_init-d3.event.y;
                        }
                        function dragged() {
                             d3.select(this).classed("active", false)
                                .style("left",(d3.event.x+xOffset_tmp) + "px")
                                .style("top",(d3.event.y+yOffset_tmp) + "px")
                        }
                        function dragended() {
                          d3.select(this).style("cursor", "grab")
                          d3.select(this).classed("active", false);
                          xPos_init = d3.event.x+xOffset_tmp;
                          yPos_init = d3.event.y+yOffset_tmp;
                        }
                        
                         var schema = data.schema;
                         var treeData = (JSON.parse(JSON.stringify(schema)));
                        //aigner: Build the tree layout                    
                        //######################################################################
                        //Function to prune the tree according to list of xPaths that are actually there
                        //The tree will only be pruned if there is pipeData, such as in an edge or for the input of a tool
                        if (pipeData)
                        {
                            prune_tree(pipeData, treeData);
                        }
                        
                        //build tree layout for vistoms
                        var newTree = {};
                        buildTree(newTree, treeData)                    
                        treeData = newTree
                        //######################################################################
                        
                        // Set the dimensions and margins of the diagram
                        var margin = {top: 20, right: 90, bottom: 20, left: 90},
                            width = 960 - margin.left - margin.right,
                            height = 500 - margin.top - margin.bottom;

                        // append the svg object to the body of the page
                        // appends a 'group' element to 'svg'
                        // moves the 'group' element to the top left margin
                        var offset_tmp = 60;
                        svg = svg.attr("width", width + margin.right + margin.left+offset_tmp)
                                 .attr("height", height + margin.top + margin.bottom+offset_tmp);
                        div = div.attr("width", width + margin.right + margin.left+offset_tmp)
                                 .attr("height", height + margin.top + margin.bottom+offset_tmp);
                        layout = layout
                            .attr("width", width + margin.right + margin.left)
                            .attr("height", height + margin.top + margin.bottom);
                        var name;
                        var rect = layout.append("rect")
                                .attr("class","treeFrame")
                                .attr("width", 0)
                                .attr("height", 70)
                                .attr("transform", "translate("
                                  + String(10) + "," + String(10) + ")")
                                .attr("fill", "white")
                                .attr("stroke", "darkgrey")
                                .attr("stroke-width", 0)
                                .attr("fill-opacity", 0.8)
                        //aigner: Put remove button on top of the rect
                        d3.selectAll(".treeRemoveSymbol").moveToFront();
                        
                        //aigner: Exit, if no tree data is available!
                        if (!treeData.children || treeData.children.length==0)
                        {
                            var newText = layout.append('text')
                            .attr("dx", 40)
                            .attr("dy", 55)
                            .style("font-family", "Arial")
                            .style("font-size", "32pt")
                            .style("font-weight", "bold")
                            .html(function (d) {
                                return 'No tree view available! &#8594; Please check data for consistency!';
                            });
                            
                            var newWidth;
                            rect.attr("width",  function(d) {
                                newWidth = this.parentNode.getBBox().width+20;
                                return newWidth;}) 
                            div = div.attr("width", newWidth+30)
                            svg = svg.attr("width", newWidth+30)
                            return;
                        }
                        
                        var newText = layout.append('text')
                            .attr("dx", 40)
                            .attr("dy", 30)
                            .style("font-family", "Arial")
                            .style("font-size", "12pt")
                            .style("font-weight", "bold")
                            .text(aName);
                        
                        // Calculate total nodes, max label length
                        var totalNodes = 0;
                        var maxLabelLength = 0;
                        
                        var i = 0,
                            duration = 500,
                            root;

                        // declares a tree layout and assigns the size
                        var treemap = d3.tree().size([height, width]);

                        // Assigns parent, children, height, depth
                        root = d3.hierarchy(treeData, function(d) { return d.children; });
                        root.x0 = height / 2;
                        root.y0 = 0;
                        
                        // Append a group which holds all nodes and which the zoom Listener can act upon.
                        var svgGroup_xOff = root.data.name.length*10
                        var svgGroup = layout.append("g")
                            .attr("transform", "translate("+ svgGroup_xOff + "," + String(margin.top+10) + ")");
                        
                            
                        // Collapse root initially
                        collapse(root);
                        update(root);

                        // Collapse the node and all it's children
                        function collapse(d) {
                          if(d.children) {
                            d._children = d.children
                            d._children.forEach(collapse)
                            d.children = null
                          }
                        }
                        // Collapse the node and all it's children
                        function expand(d) {
                          if(d._children) {
                            d.children = d._children
                            d.children.forEach(expand)
                            d._children = null
                          }
                        }
                        // Toggle children on click.
                        function click(d) 
                        {
                            if (d.children) {
                                d._children = d.children;
                                d.children = null;
                            } else 
                            {
                                d.children = d._children;
                                d._children = null;
                            }
                            update(d);
                        }
                        // Collapse/expand entire tree on double-click
                        function dblclick(d) 
                        {
                            if(d.children) 
                            {
                                collapse(d);
                            }
                            else if(d._children)
                            {
                                expand(d);
                            }
                            update(d);
                        }	
                        
                        function update(source) 
                        {
                            var levelWidth = [1];
                            var getLevelWidth = function(level, n) 
                            {
                                if (n.children && n.children.length > 0) {
                                    if (levelWidth.length <= level + 1) levelWidth.push(0);
                                    
                                    //establish maxLabelLength
                                    maxLabelLength = Math.max(n.data.name.length, maxLabelLength);
                                    
                                    levelWidth[level + 1] += n.children.length;
                                    n.children.forEach(function(d) {
                                        getLevelWidth(level + 1, d);
                                    });
                                }
                            };
                            getLevelWidth(0, root);
                            var newHeight = d3.max(levelWidth) * 60; // 20 pixels per line
                            //BENNI: fill in viewerHeight instead of newHeight for other expanding/collapsing beaviour 
                            
                            layout = layout.attr("height", newHeight + margin.top + margin.bottom)
                            svgGroup = svgGroup.attr("height", newHeight + margin.top + margin.bottom)
                            treemap = treemap.size([newHeight, width]);
                            
                            
                            // Assigns the x and y position for the nodes
                            var treeData = treemap(root);

                            // Compute the new tree layout.
                            var nodes = treeData.descendants(),
                                links = treeData.descendants().slice(1);
                            
                            //aigner: count all descendants of a node
                            function countDescendants(node, counter) 
                            {
                                if (node._children)
                                {
                                    node._children.forEach(function(n)
                                    {
                                        counter = countDescendants(n, counter);
                                    });
                                }
                                else if (node.children)
                                {
                                    node.children.forEach(function(n)
                                    {
                                        counter = countDescendants(n, counter);
                                    });
                                }
                                else
                                {
                                    counter ++;
                                }
                                return counter;
                            }
                            
                            
                            var depth_tmp = 0;
                            var labelLength = [];
                            labelLength.push(0);
                            nodes.forEach(function(d) 
                            {				
                                //aigner: If node is collapsed show number of ancestors
                                if (d._children)
                                {
                                    d._childrenNum = countDescendants(d, 0);
                                    d.data.text = d.data.name + " (" + d._childrenNum + ")";
                                }
                                else 
                                {
                                    d.data.text = d.data.name
                                }
                                
                                //aigner: Find maximum labelLength for each level
                                if (d.depth>depth_tmp)
                                {
                                    depth_tmp = d.depth;
                                    labelLength.push(d.data.text.length);
                                }
                                else
                                {
                                    if (d.depth!=0){labelLength[labelLength.length-1] = Math.max(d.data.text.length, labelLength[labelLength.length-1]);}
                                }
                            });
                            // Set widths between levels based on labelLength of each level.
                            var y_tmp = 100;		
                            var depth_tmp = 0;							
                            nodes.forEach(function(d) 
                            {
                                if (d.depth>depth_tmp)
                                {
                                    depth_tmp = d.depth;
                                    d.y = y_tmp+(labelLength[depth_tmp])*12+50;
                                }
                                else
                                {
                                    d.y = y_tmp;
                                }
                                newWidth=d.y;
                                y_tmp = d.y;
                            });
                            
                            
                            function getTextWidth(text, font) 
                            {
                                // re-use canvas object for better performance
                                var canvas = getTextWidth.canvas || (getTextWidth.canvas = document.createElement("canvas"));
                                var context = canvas.getContext("2d");
                                context.font = font;
                                var metrics = context.measureText(text);
                                return metrics.width;
                            }					
                            newWidth=Math.max(newWidth,getTextWidth(aName,"Arial 12pt"));
                            
                            //aigner: Adjust height and width of the frame
                            div = div.attr("height", newHeight + margin.top + margin.bottom+offset_tmp)
                            div = div.attr("width", newWidth + margin.top + margin.bottom +400+maxLabelLength*25+offset_tmp)
                                .on("mousedown", function(d) {
                                    //d3.select(this).moveToFront();
                                })
                            svg = svg.attr("height", newHeight + margin.top + margin.bottom+offset_tmp)
                            svg = svg.attr("width", newWidth + margin.top + margin.bottom +400+maxLabelLength*25+offset_tmp)
                            rect = rect.attr("height", newHeight + margin.top + margin.bottom)
                            rect = rect.attr("width", newWidth + margin.top + margin.bottom+400+maxLabelLength*15)
                            
                            
                            // ****************** Nodes section ***************************
                            // Update the nodes...
                            var node = svgGroup.selectAll('g.treeNode')
                              .data(nodes, function(d) {return d.id || (d.id = ++i); });
                            
                            var dblclick_timer = false;
                            // Enter any new modes at the parent's previous position.
                            var nodeEnter = node.enter().append('g')
                              .attr('class', 'treeNode')
                              .attr("transform", function(d) {
                                return "translate(" + source.y0 + "," + source.x0 + ")";
                            })
                            .on("mousedown", function(d) {
                                //prevent tree from expanding on right click!
                                if (d3.event.which != 3)
                                {
                                    // if double click timer is active, this click is the double click
                                    if ( dblclick_timer )
                                    {
                                        clearTimeout(dblclick_timer)
                                        dblclick_timer = false
                                        // double click code code comes here
                                        //console.log("DOUBLE CLICK")
                                        dblclick(d);
                                    }
                                    // otherwise, what to do after single click (double click has timed out)
                                    else dblclick_timer = setTimeout( function(){
                                        dblclick_timer = false
                                        // single click code code comes here
                                        //console.log("SINGLE CLICK")
                                        click(d);
                                    }, 250)
                                }
                                
                            })
                            
                            // Add Circle for the nodes
                            nodeEnter.append('circle')
                              .attr('class', 'treeNode')
                              .attr('r', 4.5)
                              .style("fill", function(d) {
                                    if (d._children)
                                    {
                                        if(aName.includes("Input")){return '#ea9999'}
                                        else if(aName.includes("Output")){return '#d6ea99'}
                                        else {return "lightsteelblue"}
                                    }
                                    else {return "#fff"}
                              })
                              .style("stroke", function(d) {
                                    if(aName.includes("Input")){
                                        //console.log(d);
                                        return '#CC0000'}
                                    else if(aName.includes("Output")){
                                        //console.log(d);
                                        return '#99CC00'}
                              });

                            // Add labels for the nodes
                            nodeEnter.append('text')
                              .attr('class', 'nodeText')
                              .attr("dy", ".35em")
                              .attr("x", function(d) {
                                  return d.children || d._children ? -13 : 13;
                              })
                              .attr("text-anchor", function(d) {
                                  return d.children || d._children ? "end" : "start";
                              })
                              //.text(function(d) { return d.data.text; });
                              
                              
                            // Function to download data to a file
                            function download(filename, text) {
                                var element = document.createElement('a');
                                element.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(text));
                                element.setAttribute('download', filename);

                                element.style.display = 'none';
                                document.body.appendChild(element);

                                element.click();

                                document.body.removeChild(element);
                            }
                            
                            //Highlight function, that shows usage of a node in the XDSM
                            function highlight(data,aText)
                            {
                                aText = "/"+data.data.name+aText;
                                if (data.parent){highlight(data.parent,aText)}
                                else
                                {
                                    scenarioKeys.forEach(function(k)
                                    {
                                        var xdsm_tmp;
                                        xdsm_tmp = xdsms[k];
                                        if (xdsm_tmp)
                                        {
                                            xdsm_tmp.svg.selectAll(".edge").each(function(p) 
                                            {
                                                var firstElement_tmp = p.name.split("/")[1]
                                                var text_fromFirst = "/"+firstElement_tmp+aText.split(firstElement_tmp)[1]
                                                if (include(p.name,text_fromFirst))
                                                {
                                                    var highlightEdge = d3.select(this).select("polygon");
                                                    highlightEdge
                                                        .style("stroke-width",5.)
                                                        .style("stroke","#CC0000")
                                                    d3.selectAll(".treeFrame")
                                                        .attr("fill-opacity", 0.5)
                                                        .attr("stroke-opacity", 0.5);
                                                    d3.selectAll(".nodeText").style("fill-opacity",0.5);
                                                }
                                            })
                                        }
                                    })
                                }
                            }
                            
                            //Unhighlight function again
                            function unhighlight(data,aText)
                            {
                                aText = "/"+data.data.name+aText;
                                if (data.parent){unhighlight(data.parent,aText)}
                                else
                                {
                                    scenarioKeys.forEach(function(k)
                                    {
                                        var xdsm_tmp;
                                        xdsm_tmp = xdsms[k];
                                        if (xdsm_tmp)
                                        {
                                            xdsm_tmp.svg.selectAll(".edge").each(function(p) 
                                            {
                                                var firstElement_tmp = p.name.split("/")[1]
                                                var text_fromFirst = "/"+firstElement_tmp+aText.split(firstElement_tmp)[1]
                                                if (include(p.name,text_fromFirst))
                                                {
                                                    var highlightEdge = d3.select(this).select("polygon");
                                                    highlightEdge
                                                        .style("stroke-width",1.)
                                                        .style("stroke","black");
                                                    d3.selectAll(".treeFrame")
                                                        .attr("fill-opacity", 0.8)
                                                        .attr("stroke-opacity", 0.8);
                                                    d3.selectAll(".nodeText").style("fill-opacity",1);
                                                }
                                            })
                                        }
                                    })
                                }
                            }							
                              
                            
                            function showVariableTable(aVariable)
                            {						
                                var varTableDiv = d3.select(".modelViewerDiv").append("div").attr("class","varTableDiv_"+aName+"_"+aVariable.data.name)
                                    .style('left', (d3.event.pageX - 2) + 'px')
                                    .style('top', (d3.event.pageY - 2) + 'px')
                                    .style("position", "absolute")
                                    .on("mousedown", function(d) {
                                        d3.select(this).moveToFront();
                                    })
                                var varTableGroup = varTableDiv.append("g").attr("class","varTableGroup")
                                
                                //Drag Function for variable table
                                var xPos_init = d3.event.pageX - 2;
                                var yPos_init = d3.event.pageY - 2;
                                var xOffset_tmp;
                                var yOffset_tmp;
                                var drag = varTableDiv.call(d3.drag()
                                    .on("start", dragstarted)
                                    .on("drag", dragged)
                                    .on("end", dragended));
                                function dragstarted() {
                                  d3.select(this).raise().classed("active", true);
                                  xOffset_tmp = xPos_init-d3.event.x;
                                  yOffset_tmp = yPos_init-d3.event.y;
                                }
                                function dragged() {
                                     d3.select(this).classed("active", false)
                                        .style("left",(d3.event.x+xOffset_tmp) + "px")
                                        .style("top",(d3.event.y+yOffset_tmp) + "px")
                                }
                                function dragended() {
                                  d3.select(this).classed("active", false);
                                  xPos_init = d3.event.x+xOffset_tmp;
                                  yPos_init = d3.event.y+yOffset_tmp;
                                }
                                
                                var headLine = "Node Information (" + aName + ")";
                                var tabRemoveSVG = varTableGroup.append("svg")
                                    .attr("width",String(headLine.length*9.5+"pt"))
                                    .attr("height",26)
                                tabRemoveSVG.append("rect")
                                    .attr("width", "100%")
                                    .attr("height", "100%")
                                    .attr("fill", "white");
                                var tabRemoveSymbol = tabRemoveSVG.append("g");
                                tabRemoveSymbol = tabRemoveSymbol
                                    .attr("class", "tabRemoveSymbol")
                                    .attr("transform", "translate(26,0)")
                                var circle = tabRemoveSymbol.append("circle")
                                    .classed("remCircle",true)
                                var minus = tabRemoveSymbol.append("line").classed("remMinus",true)
                                var cx = -20;
                                var cy = 12;
                                circle = circle
                                    .attr("cx", cx+5)
                                    .attr("cy", cy)
                                    .attr("r", 10)
                                minus = minus
                                    .attr("x1", cx)
                                    .attr("y1", cy)
                                    .attr("x2", cx+10)
                                    .attr("y2", cy)
                                    
                                
                                tabRemoveSVG.append("text").attr("class","tabRemoveText")
                                    .attr("transform", "translate(26,20)")
                                    .attr("fill", "black")
                                    .style("font-family", "Arial")
                                    .style("font-size", "16pt")
                                    .style("font-weight", "bold")
                                    .text(headLine);
                                
                                
                                tabRemoveSymbol
                                    .on("mouseover", function(){
                                        d3.select(this).style("cursor", "pointer")
                                        circle.style("fill", "red").style("fill-opacity", .8);
                                        })
                                    .on("mouseout", function(){circle.style("fill", "red").style("fill-opacity", .6)})
                                tabRemoveSymbol.on("mousedown", function(d)
                                {
                                    varTableDiv.remove();
                                })
                                
                                
                                
                                var data = [];
                                // render the table(s)
                                data.push({ "name" : "Name", "value" : "\""+aVariable.data.name+"\"" })
                                
                                function getNodeXPath(strWrapper,aNode) 
                                {
                                  strWrapper.val = "/"+aNode.data.name+strWrapper.val;
                                  if (!aNode.parent) 
                                  {
                                    return strWrapper;
                                  }
                                  else 
                                  {
                                    
                                    return getNodeXPath(strWrapper, aNode.parent);
                                  }
                                }
                                var xPath_tmp = getNodeXPath({ val : '' }, aVariable).val;
                                data.push({ "name" : "xPath", "value" : xPath_tmp })
                                if (aVariable.data.type){data.push({ "name" : "Type", "value" : aVariable.data.type })}
                                if (aVariable.data.level){data.push({ "name" : "Level", "value" : aVariable.data.level })}
                                if (aVariable.data.children){data.push({ "name" : "Number of children", "value" : aVariable.data.children.length })}
                                if (aVariable.data.dimension){data.push({ "name" : "Dimension", "value" : aVariable.data.dimension })}
                                else if(aVariable.data.dimension===null){data.push({ "name" : "Dimension", "value" : "undefined" })}
                                if (aVariable.data.value){data.push({ "name" : "Value(s)", "value" : aVariable.data.value })}
                                var table = varTableGroup.append('table');
                                tabulate(table,data,['name', 'value']); // 2 column table
                            }
                            
                           
                            //menu --> functions for right click options
                            var nodeMenu = [
                            {
                                title: 'Show node information',
                                onMouseDown: function(elm, d, i) {
                                    showVariableTable(d);
                                },
                                onMouseUp: function(elm, d, i) {},
                                onMouseOver: function(elm, d, i) {},
                                childrenItems: []
                            },
                            {
                                title: 'Copy x-path to clipboard',
                                onMouseDown: function(elm, d, i) {
                                    function copyToClipboard(text) 
                                    {
                                        window.prompt("Copy to clipboard: Ctrl+C, Enter", text);
                                    }
                                    function copyXPathToClipboard(data,aText)
                                    {
                                        aText = "/"+data.data.name+aText;
                                        if (data.parent){copyXPathToClipboard(data.parent,aText)}
                                        else{copyToClipboard(aText);}
                                    }
                                    var copyText="";
                                    copyXPathToClipboard(d,copyText);
                                    d3.select('.d3-context-menu').style('display', 'none');
                                },
                                onMouseUp: function(elm, d, i) {
                                },
                                onMouseOver: function(elm, d, i) {
                                },
                                childrenItems: []
                            },
                            {
                                title: 'Download full tree as XML-file',
                                onMouseDown: function(elm, d, i) {
                                    //Begin xml structure with the first element
                                    var xmlString = "<"+nodes[0].data.name+">"+"</"+nodes[0].data.name+">";
                                    //Create a new xml document
                                    var parser = new DOMParser();
                                    var xmlDocument = parser.parseFromString(xmlString, "text/xml"); //important to use "text/xml"
                                    //Get initial xPath of the tree and pass it to the function "writeTreeToXML"
                                    var initialXPath = "/"+nodes[0].data.name;								
                                    writeTreeToXML(nodes[0],xmlDocument,initialXPath);
                                    //remove all attributes dummyID
                                    removeAttributeInAllElements(xmlDocument,'dummyID');
                                    //Make the xml document a string
                                    var serializer = new XMLSerializer();
                                    var xmlString = serializer.serializeToString(xmlDocument);
                                    xmlString = vkbeautify.xml(xmlString);														
                                    //Download a document with the xml-schema
                                    download(aName+'_full.xml',xmlString);						
                                },
                                onMouseUp: function(elm, d, i) {
                                },
                                onMouseOver: function(elm, d, i) {
                                },
                                childrenItems: []
                            },
                            {
                                title: 'Download tree as XML-file from current node',
                                onMouseDown: function(elm, d, i) {
                                    var xmlString = putAncestorsInXMLString({ val : '' }, d).val;
                                    var initialXPath = putAncestorsInXPath({ val : '' }, d).val;												
                                    //Create a new xml document
                                    var parser = new DOMParser();
                                    var xmlDocument = parser.parseFromString(xmlString, "text/xml"); //important to use "text/xml"
                                    //Get initial xPath of the tree and pass it to the function "writeCurrentTreeToXML"
                                    writeTreeToXML(d,xmlDocument,initialXPath);
                                    //remove all attributes dummyID
                                    removeAttributeInAllElements(xmlDocument,'dummyID');
                                    //Make the xml document a string
                                    var serializer = new XMLSerializer();
                                    xmlString = serializer.serializeToString(xmlDocument);
                                    xmlString = vkbeautify.xml(xmlString);														
                                    //Download a document with the xml-schema
                                    download(aName+"_"+d.data.name+'.xml',xmlString);						
                                },
                                onMouseUp: function(elm, d, i) {
                                },
                                onMouseOver: function(elm, d, i) {
                                },
                                childrenItems: []
                            }
                            ]
                            
                            //Function writeTreeToXML goes through tree nodes and puts the into an xml document
                            function writeTreeToXML(aNode,anXMLDoc,anXPath)
                            {
                                //Variable "children" 
                                //--> One children variable, no matter whether a node has "_children" (collapsed) or "children" (expanded)
                                var children;
                                if (aNode._children){children = aNode._children;}
                                else if (aNode.children){children = aNode.children;}
                                
                                //Get current xml element with its xPath
                                var element = anXMLDoc.evaluate(anXPath,anXMLDoc, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null ).singleNodeValue;
                                if (element != null) {element.value = '...';}
                                
                                //If a node has children (collapsed or expanded), loop through them
                                if (children)
                                {
                                    for (var i=0; i < children.length;i++)
                                    {
                                        //Name of the new XML element --> childName
                                        var child = children[i];
                                        var childName = child.data.name.split(/[\[\]]+/);//Split childName at "[]" which is the uID 
                                        var cleanChildName = childName[0].split(/[\+\*\^\-\ \#]+/);//Split childName all special characters
                                        var newNode = anXMLDoc.createElement(String(cleanChildName[0]));
                                        
                                        //The children are appended to the xPath --> newXPath
                                        var newXPath = anXPath+"/"+cleanChildName[0];
                                        
                                        //If childName contains a uID, make the uID an attribute
                                        if (childName[1])
                                        {
                                            if (parseInt(childName[1]))
                                            {
                                                var dummyID = childName[1];
                                                newNode.setAttribute("dummyID", dummyID)
                                                newXPath = newXPath+"[@dummyID='"+dummyID+"']";
                                            }
                                            else
                                            {
                                                var uID = childName[1];
                                                newNode.setAttribute("uID", uID)
                                                newXPath = newXPath+"[@uID='"+uID+"']";
                                            }
                                        }
                                        if (cleanChildName.length>1) {newNode.setAttribute("elementName", childName[0])};
                                        
                                        //Append the newNode to the xml structure
                                        element.appendChild(newNode);
                                        
                                        
                                        
                                        ////aigner: Sorting of XML elements according to "uID"
                                        // var items = element.children;
                                        // var itemsArr = [];
                                        // for (var j in items) {
                                            // if (items[j].nodeType == 1) { // get rid of the whitespace text nodes
                                                // itemsArr.push(items[j]);
                                            // }
                                        // }
                                        // itemsArr.sort(function(a,b){
                                            // if (a.getAttribute("uID") < b.getAttribute("uID"))
                                                // return -1;
                                            // if (a.getAttribute("uID") > b.getAttribute("uID"))
                                                // return 1;
                                            // return 0;
                                            // });

                                        // for (j = 0; j < itemsArr.length; ++j) {
                                          // element.appendChild(itemsArr[j]);
                                        // }
                                        
                                        //call function writeTreeToXML recursively for all children
                                        writeTreeToXML(child,anXMLDoc,newXPath)
                                    }
                                }
                                else
                                {
                                    if (aNode.data.value){element.innerHTML = String(aNode.data.value);}
                                    else{element.innerHTML = " ";}
                                }
                                //return the xml document
                                return anXMLDoc;
                            }
                            
                            function removeAttributeInAllElements(aDocument,attribute)
                            {
                              var matchingElements = [];
                              var allElements = aDocument.getElementsByTagName('*');
                              for (var i = 0, n = allElements.length; i < n; i++)
                              {
                                if (allElements[i].getAttribute(attribute) !== null)
                                {
                                    allElements[i].removeAttribute(attribute);
                                }
                              }
                              return matchingElements;
                            }
                            
                            function putAncestorsInXMLString(strWrapper, aNode)
                            {
                                //Name of the new XML element
                                var nodeName = aNode.data.name.split(/[\[\]]+/);//Split name at "[]" which is the uID 
                                var cleanNodeName = nodeName[0].split(/[\+\*\^\-\ \#]+/);//Split nodeName all special characters
                                //If nodeName contains a uID, make the uID an attribute
                                if (nodeName[1])
                                {
                                    var uID = nodeName[1];
                                    strWrapper.val = "<"+cleanNodeName[0]+" uID='"+ uID +"'>"+strWrapper.val+"</"+cleanNodeName[0]+">";;
                                }
                                else
                                {
                                    strWrapper.val = "<"+cleanNodeName[0]+">"+strWrapper.val+"</"+cleanNodeName[0]+">";;
                                }
                                var aParent = aNode.parent;
                                if (aParent)
                                {
                                    return putAncestorsInXMLString(strWrapper, aParent);
                                }
                                else 
                                {
                                    return strWrapper;
                                }
                            }
                            
                            function putAncestorsInXPath(strWrapper, aNode)
                            {
                                //Name of the new XML element
                                var nodeName = aNode.data.name.split(/[\[\]]+/);//Split name at "[]" which is the uID 
                                var cleanNodeName = nodeName[0].split(/[\+\*\^\-\ \#]+/);//Split nodeName all special characters
                                //If nodeName contains a uID, make the uID an attribute
                                if (nodeName[1])
                                {
                                    var uID = nodeName[1];
                                    strWrapper.val = "/"+cleanNodeName[0]+"[@uID='"+uID+"']"+strWrapper.val;
                                }
                                else
                                {
                                    strWrapper.val = "/"+cleanNodeName[0]+strWrapper.val;
                                }
                                var aParent = aNode.parent;
                                if (aParent)
                                {
                                    return putAncestorsInXPath(strWrapper, aParent);
                                }
                                else 
                                {
                                    return strWrapper;
                                }
                            }
                              
                            nodeEnter = nodeEnter
                            .on('contextmenu', d3.contextMenu(nodeMenu));
                            
                            nodeEnter.append("svg:title").text("Click left to expand, click right to inspect")
                            
                            

                            // UPDATE
                            var nodeUpdate = nodeEnter.merge(node);

                            // Transition to the proper position for the node
                            nodeUpdate.transition()
                            .duration(duration)
                            .attr("transform", function(d) { 
                                return "translate(" + d.y + "," + d.x + ")";
                             });

                            // Update the node attributes and style
                            nodeUpdate.select('circle.treeNode')
                            .attr('r', 4.5)
                            .style("fill", function(d) {
                                    if (d._children)
                                    {
                                        if(aName.includes("Input")){return '#ea9999'}
                                        else if(aName.includes("Output")){return '#d6ea99'}
                                        else {return "lightsteelblue"}
                                    }
                                    else {return "#fff"}
                              })
                            .attr('cursor', 'pointer');
                            
                            nodeUpdate.select('text')
                            .text(function(d) { return d.data.text; });


                            // Remove any exiting nodes
                            var nodeExit = node.exit().transition()
                              .duration(duration)
                              .attr("transform", function(d) {
                                  return "translate(" + source.y + "," + source.x + ")";
                              })
                              .remove();

                            // ****************** links section ***************************

                            // Update the links...
                            var link = svgGroup.selectAll('path.treeLink')
                              .data(links, function(d) { return d.id; });

                            // Enter any new links at the parent's previous position.
                            var linkEnter = link.enter().insert('path', "g")
                              .attr("class", "treeLink")
                              .attr('d', function(d){
                                var o = {x: source.x0, y: source.y0}
                                return diagonal(o, o)
                              });

                            // UPDATE
                            var linkUpdate = linkEnter.merge(link);

                            // Transition back to the parent element position
                            linkUpdate.transition()
                              .duration(duration)
                              .attr('d', function(d){ return diagonal(d, d.parent) });

                            // Remove any exiting links
                            var linkExit = link.exit().transition()
                              .duration(duration)
                              .attr('d', function(d) {
                                var o = {x: source.x, y: source.y}
                                return diagonal(o, o)
                              })
                              .remove();

                            // Store the old positions for transition.
                            nodes.forEach(function(d){
                            d.x0 = d.x;
                            d.y0 = d.y;
                            });

                            // Creates a curved (diagonal) path from parent to the child nodes
                            function diagonal(s, d) {
                            return "M" + s.y + "," + s.x
                                  + "C" + (s.y + d.y) / 2 + "," + s.x
                                  + " " + (s.y + d.y) / 2 + "," + d.x
                                  + " " + d.y + "," + d.x;
                            }
                        }
                    
                    }
                }
                startDataModel(theData,"01");

                ////aigner: Unused funcktions --> Could be helpful at some point
                ////aigner: clone function, so that original object is not overwritten but deep copied
                // function clone(obj) {
                    // if (null == obj || "object" != typeof obj) return obj;
                    // var copy = obj.constructor();
                    // for (var attr in obj) {
                        // if (obj.hasOwnProperty(attr)) copy[attr] = obj[attr];
                    // }
                    // return copy;
                // }
                ////aigner: cleanArray Function
                // function cleanArray(actual) 
                // {
                    // var newArray = new Array();
                    // for (var i = 0; i < actual.length; i++) 
                    // {
                        // if (actual[i]) 
                        // {
                            // newArray.push(actual[i]);
                        // }
                    // }
                    // return newArray;
                // }
                //#####################################################################//


                },{"./src/animation":2,"./src/graph":3,"./src/xdsm":5,"d3":1}]},{},[6]);
            }
		
		
		
		
		</script>
    </body>
</html>