To compile the program to run under unix type: cc cvort.c -lm. This will produce a file named a.out which can be renamed (we suggest that for convention's sake, cvort be used as the file name). cvort.c uncompiled version of the program cvort.h contains the necessary look-up files cvortdoc.txt program documentation cvortdoc.doc cvortdoc.htm Among other projects, we have used this program to determine centrifugation times during silt fraction heavy mineral separatory analyses using sodium polytungstate. It worked fine. Good luck in your endevors! Best Regards, Larry Poppe