[ccp4bb]: MIR phasing

[Ram Thaimattam <ram@alanine.ibch.poznan.pl>]

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Dear All,

I am currently struck at the patterson heavy atom difference map interpretation
in MIR phasing. I have a native data set with data extending to 2.65 A, and 
two heavy atom derivatives, Uranium and Platinum have diffraction data extending
to 3.0 and 2.9 A respectively. Scaling the three data sets (using scaleit)shows 
good statistics. The overal R-fact for U and Pl derivative data sets are 17 and 
19% respectively. Furthermore there is a drop in the R-fact valuses at 4.8 A in
both these data sets. However, when patterson heavy atom difference maps are
calculated for these derivatives huge number of peaks are found in the map. 
There are about significant 300-400 peaks(>3sig) in both the heavy atom 
difference patterson maps. This is really anoying. I am not sure where exactly
I am doing mistake. In this regard I request to kindly help me out to solve 
this  problem.
Sincerely,
Ram