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. It also contains example
 source files that demonstrate the use of CFITSIO.