// fjcore -- extracted from FastJet v--FJVERSION-- (http://fastjet.fr)
//
// fjcore constitutes a digest of the main FastJet functionality.
// The files fjcore.hh and fjcore.cc are meant to provide easy access to these 
// core functions, in the form of single files and without the need of a full 
// FastJet installation:
//
//     g++ main.cc fjcore.cc
// 
// with main.cc including fjcore.hh.
//
// A fortran interface, fjcorefortran.cc, is also provided. See the example 
// and the Makefile for instructions.
//
// The results are expected to be identical to those obtained by linking to
// the full FastJet distribution.
//
// NOTE THAT, IN ORDER TO MAKE IT POSSIBLE FOR FJCORE AND THE FULL FASTJET
// TO COEXIST, THE FORMER USES THE "fjcore" NAMESPACE INSTEAD OF "fastjet". 
//
// In particular, fjcore provides:
//
//   - access to all native pp and ee algorithms, kt, anti-kt, C/A.
//     For C/A, the NlnN method is available, while anti-kt and kt
//     are limited to the N^2 one (still the fastest for N < 100k particles)
//   - access to selectors, for implementing cuts and selections
//   - access to all functionalities related to pseudojets (e.g. a jet's
//     structure or user-defined information)
//
// Instead, it does NOT provide:
//
//   - jet areas functionality
//   - background estimation
//   - access to other algorithms via plugins
//   - interface to CGAL
//   - fastjet tools, e.g. filters, taggers
//
// If these functionalities are needed, the full FastJet installation must be
// used. The code will be fully compatible, with the sole replacement of the
// header files and of the fjcore namespace with the fastjet one.
//
// fjcore.hh and fjcore.cc are not meant to be human-readable.
// For documentation, see the full FastJet manual and doxygen at http://fastjet.fr
//
// Like FastJet, fjcore is released under the terms of the GNU General Public
// License version 2 (GPLv2). If you use this code as part of work towards a
// scientific publication, whether directly or contained within another program
// (e.g. Delphes, MadGraph, SpartyJet, Rivet, LHC collaboration software frameworks, 
// etc.), you should include a citation to
// 
//   EPJC72(2012)1896 [arXiv:1111.6097] (FastJet User Manual)
//   and, optionally, Phys.Lett.B641 (2006) 57 [arXiv:hep-ph/0512210]
//
//FJSTARTHEADER
// $Id$
//
// Copyright (c) 2005-2024, Matteo Cacciari, Gavin P. Salam and Gregory Soyez
//
//----------------------------------------------------------------------
// This file is part of FastJet (fjcore).
//
//  FastJet is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation; either version 2 of the License, or
//  (at your option) any later version.
//
//  The algorithms that underlie FastJet have required considerable
//  development. They are described in the original FastJet paper,
//  hep-ph/0512210 and in the manual, arXiv:1111.6097. If you use
//  FastJet as part of work towards a scientific publication, please
//  quote the version you use and include a citation to the manual and
//  optionally also to hep-ph/0512210.
//
//  FastJet is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with FastJet. If not, see <http://www.gnu.org/licenses/>.
//----------------------------------------------------------------------
//FJENDHEADER
