[phenixbb] Are sigma cutoffs for R-free reflections cheating?

Pavel Afonine PAfonine at lbl.gov
Fri Dec 4 14:30:49 PST 2009

Hi Ed,

> AFAIU, Joe is referring to the situation where negative intensities are
> converted to FOBS=0.  

thanks for making this statement clear. I see now what Joe meant.

> Ignoring them would allow refinement to have any
> FCALC for these reflections when in fact we do have some information
> about them.  I am not aware of any systematic study of this question,
> but it *seems* rather obvious that ignoring zero reflections is a wrong
> thing to do *in these circumstances*.
Reference, please -:) "Rather obvious" doesn't count for me -:)


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