[phenixbb] Twin refinement issues?
Bryan W. Lepore
Bryan.Lepore at umassmed.edu
Fri Apr 10 08:37:34 PDT 2009
On Fri, 10 Apr 2009, Peter Zwart wrote:
> Twin fractions above 0.5 are physically reasonable! the twin fraction is
> the size of the twin domain. When you have a twin fraction of alpha, you
> always have a twin fraction of 1-alpha that goes with it.
this assumes two domains, right? IIRC, every discussion of twinning i
have read treats the problem in terms of two domains. what is the basis
for only having two domains (besides simplicity)?
someone mentioned a three-domain twinning problem (maybe ccp4 or phenix
bb, last week or so) - wouldn't that need "1-alpha-(third domain
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