Paul, The files in sglib.tar.Z are for the "SGLIB: The Scientific Graphics Library", by Marilee E. Thompson, et.al. To use these files on a unix machine, type: uncompress sglib.tar.Z tar xvf sglib.tar and read the files in sglib, particularly sglib/README. Marilee tells me that the code compiles and runs well on a lot of unix machines: SUN, SGI, DECstations, DEC alpha workstations, etc. However, at least one previous version of the CRAY compiler had difficuly with lines of the form: do i=1,n .... if(...) go to 10 ... 10 enddo In order to get it to work, the last line would have to be replaced by 10 continue enddo Maybe more recent CRAY compilers (particularly the new fortran-90?) won't have this problem? Good luck. Greg