I think you are stuck with making comparisons to the final calculated
phases and FOMs.
If the resolution is high enough you can maybe use a technique like
ACORN to improve them and remove some of the bias towards the model, but
that requires 1.5A data at least..
There are some Clipper utilities in the new CCP4 release which do
similar jobs.
Eleanor
Fred. Vellieux wrote:
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On Mon, 21 Aug 2006, david lawson (JIC) wrote:
Dear All,
I would like to illustrate the improvement in phases and map quality at
various stages of a structure determination (see recent post entitled:
Molecular replacement in the "twilight zone" and space group problems).
Specifically I would like to show plots of weighted mean phase error and
map correlation vs resolution. One approach is to assume that the final
model phases and map are "correct" and use PHISTATS and OVERLAPMAP
respectively to evaluate the quality of the phases and maps at various
stages relative to these, but I suspect there may be a better way of
doing it - any helpful suggestions?
Many thanks,
Dave Lawson
Dear Dave,
I personally find phase scatter plots very useful in viewing phase
improvement. Examples can be found in Meth. Enzymology 277, 18-53.
As long as the "cloud" seen on these plots (phi1 vs phi2) get more compact
and more dense along the diagonal there is phase improvement.
Fred.
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