Hi, there are 3 P21/n space group. What are their differences? No matter which one of them I choose, it always becomes the third one. Why is this? Yundi -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://zeus.theochem.tuwien.ac.at/pipermail/wien/attachments/20111016/7c0e1347/attachment.htm>