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+WCSsubs Subroutines
+
+These subroutines, developed as part of the WCSTools software package,
+constitute a self-contained package for accessing the world coordinate
+systems of FITS or IRAF(.imh) images, with image header I/O contained
+in fitsfile.c and imhfile.c, and WCS initialization and use through the
+subroutines in wcs.c.  WCS information for an image is kept in a single
+data structure defined in wcs.h.  Pixel to WCS translations are done by
+calls to pix2wcst() or pix2wcs().  WCS to pixel translations are done
+by calls to wcs2pix() or wcsc2pix().  The contents of the files are
+briefly described in Files.  Dependencies between these files are given
+in Makefile.  Documentation, to some extent, is online at
+
+http://tdc-www.harvard.edu/software/wcstools/libwcs.wcs.html
+
+Documentation for the entire open-source WCSTools package is online at
+
+http://tdc-www.harvard.edu/software/wcstools/
+
+Projection code in wcspos.c is by Bill Cotton of NRAO and is
+protected by the Gnu Lesser General Public License, which is stated
+in the file COPYING.  Projection code in wcslib.c,
+cel.c, lin.c, proj.c, wcstrig.c, and sph.c is by Mark Calabretta
+of CSIRO and is also protected by the Gnu Lesser General Public
+License.  Code in slasubs.c is by Pat Wallace of the Starlink
+project at Cambridge University.  Doug Mink is responsible for
+the rest of the code, unless otherwise noted in the source file.
+Unless otherwise noted, this code is Copyright 2003 by the
+Smithsonian Astrophysical Observatory and protected by the Gnu
+Lesser General Public License.
+
+-Jessica Mink (jmink@cfa.harvard.edu)
+ Telescope Data Center
+ Harvard-Smithsonian Center for Astrophysics
+ Cambridge, Massachusetts
+ http://tdc-www.harvard.edu/mink