[phenixbb] Twin fraction in phenix refine

Pavel Afonine PAfonine at lbl.gov
Mon Jan 11 09:24:06 PST 2010

Hi Pietro,

>                   phenix.xtriage estimates a twin fraction
> of between 24 and 30% but then when I start the refinement
> I get 47-49%. 

- did you use phenix.refine for refinement?
- are you using the latest (or one of) version of PHENIX?

> 2. I am tempted to work with the 30% that xtriage estimates
> but do not know how: is there a way to fix alpha?

The benefits of fixing twin fraction are not clear to me. Refinement of 
it should always be better. If it's not the case I would be interested 
to have a closer look at this problem.


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