> If you assume atomic B-factors of 100 or larger and > calculate the density, I really can't see how this is possible.
Well, I do. The recipe has been published in NSB as a cautionary tale. http://www.ruppweb.org/cvs/br/rupp_2001_NSB_questions_BotA.pdf and there is quite fail-safe away to investigate http://www.ruppweb.org/Xray/tutorial/rscc.htm BR