Perple_X plotting programs generate Encapsulated PostScript that can be viewed and edited 
in most commercial graphics programs. Ghostview is a particularly efficient, free, PostSctipt
viewing programing. 

Ghostview is dependent on a PostScript interpreter called Ghostscript. 

To use Ghostview you must first install Ghostscript.

If you have a WINDOWS computer: 

   1) install Ghostscript with

      www.perplex.ethz.ch/perplex/ibm_and_mac_archives/WINDOWS/ghostview/gs704w32.exe

   2) then install Ghostview with

      www.perplex.ethz.ch/perplex/ibm_and_mac_archives/WINDOWS/ghostview/gsv46w32.exe

If you have a OSX, LINUX, or UNIX computer then follow the instructions at:

      www.ghostscript.com