Tone, We have received a request to read XSF files. I'd like to know more about xcrysden before moving on this. Can you explain to me what xcrysden does? Roughly how large the user base is? Any possibility that I get a copy of your articles sent to me off-list? Thank you, Bob Hanson hansonr@stolaf.edu current principal developer, Jmol, http://jmol.sourceforge.net/