documentation for cfitsio

 FITS (Flexible Image Transport System) is a data format most used in
 astronomy. cfitsio is a library of ANSI C routines for reading and
 writing FITS format data files. A set of Fortran-callable wrapper
 routines are also included for the convenience of Fortran
 programmers.
 .
 This package contains the CFITSIO User's Guide and QuickStart Guide
 in html, postscript and text formats, and contains documentation on
 how to use the library in your programs.