digraph G {
                resolution=100
                rankdir=UD
                bgcolor=Transparent
              
                node [style="filled",fontname="Hack" ,shape=record] //All nodes will this shape and colour
                edge [color=Gray, fontname="Hack"] //All the lines look like this
              
                StaticBase [
                label = "{StaticBase|+ read(gpi) \l + write(data) \l + flush()\l + close()\l}"
                ]

                GriddedBase [
                label = "{GriddedBase| + __init__(path, 
                                                  grid, ioclass)  \l}"
                ]

                {StaticBase}->GriddedBase [label="ioclass \l"]


}
