  Fpack is a utility program for optimally compressing images in the FITS
(Flexible Image Transport System) data format (see http://fits.gsfc.nasa.gov).
The associated funpack program restores the compressed image file back to its
original state (if a lossless compression algorithm is used). (An experimental
method for compressing FITS binary tables is also available; see section 7).
These programs may be run from the host operating system command line and are
analogous to the gzip and gunzip utility programs except that they are
optimized for FITS format images and offer a wider choice of compression
options.
