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[ccp4bb] Second moments of Z but not twinning
 

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Date: 2007-06-01


Subject: Second moments of Z but not twinning
From: "Winter, G (Graeme)" g {- dot -} winter {- at -} DL {- dot -} AC {- dot -} UK
Date: 2007-06-01
Hi Folks,

I was wondering if there is a document somewhere explaining some of the
more interesting things which can be interpreted from the plot of second
moment of Z = I'/ anywhere? I've looked around and I can't find much
beyond the things pertaining to twinning, where it will have the magical
values of 2.0 or 1.5. What about if it is say 2.0 around the low
resolution regions but gets much bigger?

Looking at the truncate source code there is a note to the effect that
the second moments may be greater than two in when you have
pseudotranslational symmetry. In this case, however, I would expect that
the effect would be uniform across the resolution ranges... any
thoughts?

Any pointers would be greatly appreciated.

Thanks,

Graeme
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