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Hello Everyone Please excuse the stupidity of this question. As you can see from the questions below, I've got myself quite confused. If anyone can point me at a simple tutorial, I'd appreciate it. I'm confused about what space group should be used where when I'm investigating a (potentially) twinned crystal. Say the apparent space group is P3(1)21. The real space group may be P3(1). Should the intensity distribution look twinned in P3(1)21? Will the moments look twinned? Or will the anomalies only appear when the data scaled in P3(1)? If I decide I have a twinning problem, and wish to try the shelx refinement, which space group do I refine in? (I haven't tried this yet, so I don't have an empirical answer.) Sue -------------------------- Sue Roberts Dept. of Biochemistry & Molecular Biophysics, University of Arizona [EMAIL PROTECTED] (520) 621-8171
