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/usr/include/wcslib-5.18/prj.inc is in wcslib-dev 5.18-1.

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The actual contents of the file can be viewed below.

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*=======================================================================
*
* WCSLIB 5.18 - an implementation of the FITS WCS standard.
* Copyright (C) 1995-2018, Mark Calabretta
*
* This file is part of WCSLIB.
*
* WCSLIB is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* WCSLIB 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with WCSLIB.  If not, see http://www.gnu.org/licenses.
*
* Direct correspondence concerning WCSLIB to mark@calabretta.id.au
*
* Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
* http://www.atnf.csiro.au/people/Mark.Calabretta
* $Id: prj.inc,v 5.18 2018/01/10 08:32:14 mcalabre Exp $
*=======================================================================

*     Functions.
      EXTERNAL  PRJPUT, PRJPTC, PRJPTD, PRJPTI,
     :          PRJGET, PRJGTC, PRJGTD, PRJGTI,
     :          PRJINI, PRJFREE, PRJPRT, PRJPERR, PRJBCHK,
     :          PRJSET, PRJX2S,  PRJS2X

      INTEGER   PRJPUT, PRJPTC, PRJPTD, PRJPTI,
     :          PRJGET, PRJGTC, PRJGTD, PRJGTI,
     :          PRJINI, PRJFREE, PRJPRT, PRJPERR, PRJBCHK,
     :          PRJSET, PRJX2S,  PRJS2X

      EXTERNAL  AZPSET, AZPX2S, AZPS2X,    PARSET, PARX2S, PARS2X,
     :          SZPSET, SZPX2S, SZPS2X,    MOLSET, MOLX2S, MOLS2X,
     :          TANSET, TANX2S, TANS2X,    AITSET, AITX2S, AITS2X,
     :          STGSET, STGX2S, STGS2X,    COPSET, COPX2S, COPS2X,
     :          SINSET, SINX2S, SINS2X,    COESET, COEX2S, COES2X,
     :          ARCSET, ARCX2S, ARCS2X,    CODSET, CODX2S, CODS2X,
     :          ZPNSET, ZPNX2S, ZPNS2X,    COOSET, COOX2S, COOS2X,
     :          ZEASET, ZEAX2S, ZEAS2X,    BONSET, BONX2S, BONS2X,
     :          AIRSET, AIRX2S, AIRS2X,    PCOSET, PCOX2S, PCOS2X,
     :          CYPSET, CYPX2S, CYPS2X,    TSCSET, TSCX2S, TSCS2X,
     :          CEASET, CEAX2S, CEAS2X,    CSCSET, CSCX2S, CSCS2X,
     :          CARSET, CARX2S, CARS2X,    QSCSET, QSCX2S, QSCS2X,
     :          MERSET, MERX2S, MERS2X,    HPXSET, HPXX2S, HPXS2X,
     :          SFLSET, SFLX2S, SFLS2X,    XPHSET, XPHX2S, XPHS2X

      INTEGER   AZPSET, AZPX2S, AZPS2X,    PARSET, PARX2S, PARS2X,
     :          SZPSET, SZPX2S, SZPS2X,    MOLSET, MOLX2S, MOLS2X,
     :          TANSET, TANX2S, TANS2X,    AITSET, AITX2S, AITS2X,
     :          STGSET, STGX2S, STGS2X,    COPSET, COPX2S, COPS2X,
     :          SINSET, SINX2S, SINS2X,    COESET, COEX2S, COES2X,
     :          ARCSET, ARCX2S, ARCS2X,    CODSET, CODX2S, CODS2X,
     :          ZPNSET, ZPNX2S, ZPNS2X,    COOSET, COOX2S, COOS2X,
     :          ZEASET, ZEAX2S, ZEAS2X,    BONSET, BONX2S, BONS2X,
     :          AIRSET, AIRX2S, AIRS2X,    PCOSET, PCOX2S, PCOS2X,
     :          CYPSET, CYPX2S, CYPS2X,    TSCSET, TSCX2S, TSCS2X,
     :          CEASET, CEAX2S, CEAS2X,    CSCSET, CSCX2S, CSCS2X,
     :          CARSET, CARX2S, CARS2X,    QSCSET, QSCX2S, QSCS2X,
     :          MERSET, MERX2S, MERS2X,    HPXSET, HPXX2S, HPXS2X,
     :          SFLSET, SFLX2S, SFLS2X,    XPHSET, XPHX2S, XPHS2X

*     Length of the PRJPRM data structure (INTEGER array) on 64-bit
*     machines.  Only needs to be 116 on 32-bit machines.
      INTEGER   PRJLEN
      PARAMETER (PRJLEN = 120)

*     Number of projection parameters supported by WCSLIB, 0 to PVN-1.
      INTEGER   PRJ_PVN
      PARAMETER (PRJ_PVN = 30)

*     Codes for PRJ data structure elements used by PRJPUT and PRJGET.
      INTEGER   PRJ_FLAG, PRJ_CODE, PRJ_R0, PRJ_PV, PRJ_PHI0,
     :          PRJ_THETA0, PRJ_BOUNDS

      PARAMETER (PRJ_FLAG      = 100)
      PARAMETER (PRJ_CODE      = 101)
      PARAMETER (PRJ_R0        = 102)
      PARAMETER (PRJ_PV        = 103)
      PARAMETER (PRJ_PHI0      = 104)
      PARAMETER (PRJ_THETA0    = 105)
      PARAMETER (PRJ_BOUNDS    = 106)

*     Codes for PRJ data structure elements used by PRJGET (only).
      INTEGER   PRJ_NAME, PRJ_CATEGORY, PRJ_PVRANGE, PRJ_SIMPLEZEN,
     :          PRJ_EQUIAREAL, PRJ_CONFORMAL, PRJ_GLOBAL, PRJ_DIVERGENT,
     :          PRJ_X0, PRJ_Y0, PRJ_ERR, PRJ_W, PRJ_N

      PARAMETER (PRJ_NAME      = 200)
      PARAMETER (PRJ_CATEGORY  = 201)
      PARAMETER (PRJ_PVRANGE   = 202)
      PARAMETER (PRJ_SIMPLEZEN = 203)
      PARAMETER (PRJ_EQUIAREAL = 204)
      PARAMETER (PRJ_CONFORMAL = 205)
      PARAMETER (PRJ_GLOBAL    = 206)
      PARAMETER (PRJ_DIVERGENT = 207)
      PARAMETER (PRJ_X0        = 208)
      PARAMETER (PRJ_Y0        = 209)
      PARAMETER (PRJ_ERR       = 210)
      PARAMETER (PRJ_W         = 211)
      PARAMETER (PRJ_N         = 212)

*     Projection categories.
      INTEGER   PRJ_ZENITHAL, PRJ_CYLINDRICAL, PRJ_PSEUDOCYLINDRICAL,
     :          PRJ_CONVENTIONAL, PRJ_CONIC, PRJ_POLYCONIC,
     :          PRJ_QUADCUBE, PRJ_HEALPIX

      PARAMETER (PRJ_ZENITHAL          = 1)
      PARAMETER (PRJ_CYLINDRICAL       = 2)
      PARAMETER (PRJ_PSEUDOCYLINDRICAL = 3)
      PARAMETER (PRJ_CONVENTIONAL      = 4)
      PARAMETER (PRJ_CONIC             = 5)
      PARAMETER (PRJ_POLYCONIC         = 6)
      PARAMETER (PRJ_QUADCUBE          = 7)
      PARAMETER (PRJ_HEALPIX           = 8)

*     Error codes and messages.
      INTEGER   PRJERR_SUCCESS, PRJERR_NULL_POINTER, PRJERR_BAD_PARAM,
     :          PRJERR_BAD_PIX, PRJERR_BAD_WORLD

      PARAMETER (PRJERR_SUCCESS      = 0)
      PARAMETER (PRJERR_NULL_POINTER = 1)
      PARAMETER (PRJERR_BAD_PARAM    = 2)
      PARAMETER (PRJERR_BAD_PIX      = 3)
      PARAMETER (PRJERR_BAD_WORLD    = 4)

      CHARACTER PRJ_ERRMSG(0:4)*80
      COMMON /PRJ_DATA/ PRJ_ERRMSG