Re: [ccp4bb] symmetry possibilities

2022-07-23 Thread Dom Bellini
Hi Jorge, > > Should I look at anything else to establish twin P1 is the best way to refine > this structure? You could feed your refined model and map coefficients to Zanuda (CCP4 program) which automatically will check which higher symmetry space group will give lower Rfactors in refinement

Re: [ccp4bb] symmetry possibilities

2022-07-23 Thread Eleanor Dodson
eleanorOh dear - why don’t crystals behave better! Re twinning - do the data processing Plots indicate twinning? ( L test?2nd moments?) It sounds rather more like overlapping diffraction where only some of the observations are Affected. Eleanor On Thu, 21 Jul 2022 at 10:50, Flaig, Ralf (DLSLtd

Re: [ccp4bb] symmetry possibilities

2022-07-23 Thread Ben Bax
Hi Jorge, I have had some similar cases. The twin fraction can vary during data collection on the synchrotron (different areas of the crystal can have different twin fractions). Sometimes this is not a problem and twin refinement works fine - sometimes it is a problem and it is hard to get a cle