Re: [ccp4bb]: Refinement vs twinned data

["Eleanor J. Dodson" <ccp4@ysbl.york.ac.uk>]

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Iain Kerr wrote:
> 
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> 
> I am refining a model constructed  from MAD phases,  vs a native set of
> twinned data treated with DETWIN. The data are merohedrally twinned in P61
> & the twin fraction is estimated to be 0.3 using the Yeates server.
> 
> The native data go to 1.2A, but refinement doesn't seem possible beyond
> 1.5A ie. the residuals don't drop any further. 




Not sure what you mean by this?   Your model can improve as you add more
data without the R factor going down? 
But maybe I misunderstand you...


Eleanor