I don't know if anyone has ever used it for biology datasets, but from what I have seen ViSit is very capable. http://www.llnl.gov/VisIt/home.html Andrew -- Andrew Shewmaker, Associate Engineer Phone: 1-208-526-1276 Idaho National Eng. and Environmental Lab. P.0. Box 1625, M.S. 3605 Idaho Falls, Idaho 83415-3605