Graphical displays are provided through gnuplot , so it should be possible to use them on any system that has gnuplot installed. If you do not currently have gnuplot , see section 2.2.2 for instructions on how to obtain it. MGGHAT interfaces with gnuplot through a set of C routines written by Przemek Klosowski of NIST that allow FORTRAN programs to send commands to gnuplot . (See the file gnuplt.c.)