Instructions: ============= If you have retrieved the arpack96.tar.Z file then issue the following command zcat arpack96.tar.Z | tar -xvf - which will create a directory named ARPACK. Change to the ARPACK directory and read the file README for further instruction. If you have retrieved the arpack96.tar.gz file then issue the following command zcat arpack96.tar.gz | tar -xvf - which will create a directory named ARPACK. Change to the ARPACK directory and read the file README for further instruction. Note that for the command above to work the "zcat" command must be the Gnu version of the command which is sometimes called "gzcat", consult your local support staff if this is a problem.