[ccp4bb]: Re: Twinning problems

["Dr. Dmitriy Alexeev" <dima@holyrood.ed.ac.uk>]

                50% twinning diagnostics

Are anomalous correlations between twinned reflections any different
between, say, 50% twinned P3 and true P3112? Generally - not very much.
Ideally (no errors) corr=1 for both. Except for a subgroup of
reflections! If twinning operator accidently relates I+ and a copy of I-
then corr=1 for a twin and corr=-1 for a true spacegroup. I found it
rather useful.

Dmitriy Alexeev, Edinburgh.
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