/usr/include/liggghts/global_properties.h is in libliggghts-dev 3.3.1+repack1-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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    This is the
    ██╗     ██╗ ██████╗  ██████╗  ██████╗ ██╗  ██╗████████╗███████╗
    ██║     ██║██╔════╝ ██╔════╝ ██╔════╝ ██║  ██║╚══██╔══╝██╔════╝
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    ██║     ██║██║   ██║██║   ██║██║   ██║██╔══██║   ██║   ╚════██║
    ███████╗██║╚██████╔╝╚██████╔╝╚██████╔╝██║  ██║   ██║   ███████║
    ╚══════╝╚═╝ ╚═════╝  ╚═════╝  ╚═════╝ ╚═╝  ╚═╝   ╚═╝   ╚══════╝®
    DEM simulation engine, released by
    DCS Computing Gmbh, Linz, Austria
    http://www.dcs-computing.com, office@dcs-computing.com
    LIGGGHTS® is part of CFDEM®project:
    http://www.liggghts.com | http://www.cfdem.com
    Core developer and main author:
    Christoph Kloss, christoph.kloss@dcs-computing.com
    LIGGGHTS® is open-source, distributed under the terms of the GNU Public
    License, version 2 or later. It 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. You should have
    received a copy of the GNU General Public License along with LIGGGHTS®.
    If not, see http://www.gnu.org/licenses . See also top-level README
    and LICENSE files.
    LIGGGHTS® and CFDEM® are registered trade marks of DCS Computing GmbH,
    the producer of the LIGGGHTS® software and the CFDEM®coupling software
    See http://www.cfdem.com/terms-trademark-policy for details.
-------------------------------------------------------------------------
    Contributing author and copyright for this file:
    Christoph Kloss (DCS Computing GmbH, Linz)
    Christoph Kloss (JKU Linz)
    Richard Berger (JKU Linz)
    Copyright 2012-     DCS Computing GmbH, Linz
    Copyright 2009-2012 JKU Linz
------------------------------------------------------------------------- */
#ifndef GLOBAL_PROPERTIES_H_
#define GLOBAL_PROPERTIES_H_
#include "property_registry.h"
#define BIG 1.0e20
namespace MODEL_PARAMS
{
  /* -----------------------------------------------------------------------
   * Utility functions
   * ----------------------------------------------------------------------- */
  ScalarProperty* createScalarProperty(PropertyRegistry & registry, const char* name, const char * caller);
  ScalarProperty* createScalarProperty(PropertyRegistry & registry, const char* name, const char * caller, bool sanity_checks, const double lo = -BIG, const double hi = BIG);
  VectorProperty* createPerTypeProperty(PropertyRegistry & registry, const char* name, const char * caller);
  VectorProperty* createPerTypeProperty(PropertyRegistry & registry, const char* name, const char * caller, bool sanity_checks, const double lo = -BIG, const double hi = BIG);
  MatrixProperty* createPerTypePairProperty(PropertyRegistry & registry, const char * name, const char * caller);
  MatrixProperty* createPerTypePairProperty(PropertyRegistry & registry, const char * name, const char * caller, bool sanity_checks, const double lo = -BIG, const double hi = BIG);
  /* -----------------------------------------------------------------------
   * Property Creators
   * ----------------------------------------------------------------------- */
  MatrixProperty* createCohesionEnergyDensity(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  VectorProperty* createCohesionDistanceSettings(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  ScalarProperty* createCharacteristicVelocity(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  VectorProperty* createYoungsModulus(PropertyRegistry & registry, const char * caller, bool sanity_checks) ;
  VectorProperty* createPoissonsRatio(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createYeff(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createGeff(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createCoeffRest(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createCoeffRestLog(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createBetaEff(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createCoeffFrict(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createCoeffRollFrict(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createCoeffRollVisc(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createCoeffMu(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createCoeffRestMax(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createCoeffStc(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  ScalarProperty* createRollingStiffness(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  ScalarProperty* createLiquidVolume(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  ScalarProperty* createSurfaceTension(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  ScalarProperty* createSwitchModel(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  ScalarProperty* createHistoryIndex(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  VectorProperty* createContactAngle(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createKn(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createKt(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createGamman(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createGammat(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createGammanAbs(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createGammatAbs(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createCoeffMaxElasticStiffness(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createCoeffAdhesionStiffness(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  MatrixProperty* createCoeffPlasticityDepth(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  ScalarProperty* createRoughnessAbsolute(PropertyRegistry & registry, const char * caller, bool sanity_checks);
  ScalarProperty* createRoughnessRelative(PropertyRegistry & registry, const char * caller, bool sanity_checks);
}
#endif /* GLOBAL_PROPERTIES_H_ */
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