This file is indexed.

/usr/include/liggghts/dump_xyz.h is in libliggghts-dev 3.7.0+repack1-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/* ----------------------------------------------------------------------
    This is the

    ██╗     ██╗ ██████╗  ██████╗  ██████╗ ██╗  ██╗████████╗███████╗
    ██║     ██║██╔════╝ ██╔════╝ ██╔════╝ ██║  ██║╚══██╔══╝██╔════╝
    ██║     ██║██║  ███╗██║  ███╗██║  ███╗███████║   ██║   ███████╗
    ██║     ██║██║   ██║██║   ██║██║   ██║██╔══██║   ██║   ╚════██║
    ███████╗██║╚██████╔╝╚██████╔╝╚██████╔╝██║  ██║   ██║   ███████║
    ╚══════╝╚═╝ ╚═════╝  ╚═════╝  ╚═════╝ ╚═╝  ╚═╝   ╚═╝   ╚══════╝®

    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:
    This file is from LAMMPS
    LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
    http://lammps.sandia.gov, Sandia National Laboratories
    Steve Plimpton, sjplimp@sandia.gov

    Copyright (2003) Sandia Corporation.  Under the terms of Contract
    DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
    certain rights in this software.  This software is distributed under
    the GNU General Public License.
------------------------------------------------------------------------- */

#ifdef DUMP_CLASS

DumpStyle(xyz,DumpXYZ)

#else

#ifndef LMP_DUMP_XYZ_H
#define LMP_DUMP_XYZ_H

#include "dump.h"

namespace LAMMPS_NS {

class DumpXYZ : public Dump {
 public:
  DumpXYZ(class LAMMPS *, int, char**);
  ~DumpXYZ();

 private:
  int ntypes;
  char **typenames;

  void init_style();
  void write_header(bigint);
  void pack(int *);
  int convert_string(int, double *);
  void write_data(int, double *);
  int modify_param(int, char **);

  typedef void (DumpXYZ::*FnPtrWrite)(int, double *);
  FnPtrWrite write_choice;              // ptr to write data functions
  void write_string(int, double *);
  void write_lines(int, double *);
};

}

#endif
#endif

/* ERROR/WARNING messages:

E: Illegal ... command

Self-explanatory.  Check the input script syntax and compare to the
documentation for the command.  You can use -echo screen as a
command-line option when running LAMMPS to see the offending line.

E: Invalid dump xyz filename

Filenames used with the dump xyz style cannot be binary or cause files
to be written by each processor.

E: Dump modify element names do not match atom types

Number of element names must equal number of atom types.

*/