/usr/include/fastjet/internal/numconsts.hh is in libfastjet-dev 3.0.6+dfsg-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// $Id: numconsts.hh 2577 2011-09-13 15:11:38Z salam $
//
// Copyright (c) 2005-2011, Matteo Cacciari, Gavin P. Salam and Gregory Soyez
//
//----------------------------------------------------------------------
// This file is part of FastJet.
//
// 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 and are described in hep-ph/0512210. If you use
// FastJet as part of work towards a scientific publication, please
// include a citation to the FastJet paper.
//
// 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/>.
//----------------------------------------------------------------------
//ENDHEADER
#ifndef __FASTJET_NUMCONSTS__
#define __FASTJET_NUMCONSTS__
#include "fastjet/internal/base.hh"
FASTJET_BEGIN_NAMESPACE // defined in fastjet/internal/base.hh
// some common useful constants!
const double pi = 3.141592653589793238462643383279502884197;
const double twopi = 6.283185307179586476925286766559005768394;
const double pisq = 9.869604401089358618834490999876151135314;
const double zeta2 = 1.644934066848226436472415166646025189219;
const double zeta3 = 1.202056903159594285399738161511449990765;
const double eulergamma = 0.577215664901532860606512090082402431042;
const double ln2 = 0.693147180559945309417232121458176568076;
FASTJET_END_NAMESPACE
#endif // __FASTJET_NUMCONSTS__
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