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Re: [ccp4bb]: Twinning/Merging

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On Fri, 15 Dec 2000, Jim Pflugrath wrote:

> [... snip ...]
> > ... For weak crystals, collected with in-house 
> > instrumentation, 16% Rmerge is not uncommon. Best of all, tons of 
> I disagree.  One should be able to expose longer in-house to get the
> required counting statistics, so that Rmerge is lower.

What I wrote applies to in-house cryo-cooled crystals.  With RT data
collection, radiation damage can be a serious problem that is not easily
corrected by current data massaging programs.  After all, the contents of
the unit cell changes during the course of the experiment due to radiation