[phenixbb] How the sharpening were performed in PHENIX.

zhangh1 at umbc.edu zhangh1 at umbc.edu
Tue Jul 19 19:32:17 PDT 2011

Got it! Thanks a lot Pavel.
> Hi Hailiang,
>> I was trying to do a B-factor sharpening using phenix GUI CreatMaps
>> utilities. The output for the sharpened maps contains 2FOFCWT and
>> PHI2FOFCWT columes, so I think they are sigmaA weighted 2Fo-Fc maps.
> there is no need to guess. If you look at the "Map type" filed it will
> tell you which map you computed. Looking right now: "Map type" says
> "2mFo-DFc", and the corresponding labels are 2FOFCWT, PH2FOFCWT.
> So the answer: yes, what you get is the maximum-likelihood weighted map.
>> But
>> from Brunger's paper, the sharpening coefficients seems directly applied
>> on Fo, and I wonder what happened before we get the 2mFoDFc maps. Or,
>> the
>> sharpening coefficients have been applied to the 2mFoDFc maps?
> I do not remember what's in that paper, my vague recollection is that
> the exp(B*s**2) is applied to F=map_coefficients. Anyway, in PHENIX the
> exp B-sharpening applied to the map coefficients (not to Fobs). You have
> two options here: provide your own B-factor to be used for sharpening or
> let PHENIX determine it automatically.
> Pavel.

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