As other people have advised in response to some of your previous posts: Invest in a copy of Bernard Rupp's fantastic text book. Judging from the number of posts you make, you seem interested in learning the art of crystallography. This book will answer most if not all of your questions
http://www.ruppweb.org/default.htm ________________________________________ From: Smith Liu [smith_liu...@163.com] Sent: Tuesday, May 12, 2015 9:47 PM To: CCP4BB@JISCMAIL.AC.UK Subject: [ccp4bb] on space group Dear All, Alhough there are on-line explainations on the space group, I found it was difficult to fully understand. Here we take P 1 21 1 as an exmaple, will you please explain to me with easy language what each number indicates？Or do we have a on-line server which can demonstrate the meaning of each number? How can we get out crystal arrangement with repeating the unit cell in the format of space group? Smith
