Hi,

An alternative is to assess the quality of the phases (which are the
result of the model refined against the data) via radiation-damage
maps (what we call "F(early)-F(late) maps"). Assuming you collected
high enough multiplicity data, autoPROC (which is what you used for
processing, if I understood you right) would create those extra
amplitudes in the output MTZ files if possible. Refinement with BUSTER
would automatically compute and analyse those raditation damage maps
for "interesting" sites, like decarboxylation, Cys-SG/Met-SD damage
etc. You could then assume that the cleanest/strongest indications of
such radiation damage arise when using the best phases (i.e. best
model - as a result of best data to refine against).

For examples see e.g.

  https://www.globalphasing.com/buster/wiki/index.cgi?Covid19ReRefineRadDam
  https://www.globalphasing.com/buster/wiki/index.cgi?Covid19ReRefine5VZR

and also

  https://www.mail-archive.com/ccp4bb@jiscmail.ac.uk/msg49077.html

This would all be scriptable I guess.

Cheers

Clemens

PS: there are only really two files coming out of autoPROC, namely
    truncate-unique.mtz (traditional, isotropic analysis) and
    staraniso_alldata-unique.mtz (anisotropic analysis via STARANISO).


On Wed, Oct 27, 2021 at 12:58:53PM -0500, Murpholino Peligro wrote:
> So... how can I get a metric for noise in electron density maps?
> First thing that occurred to me
> open in coot and do validate->difference map peaks-> get number of peaks
> (is this scriptable?)
> or
> Second
> phenix.real_space_correlation detail=residue file.pdb file.mtz
> 
> 
> Thanks again
> 
> El mié, 27 de oct. de 2021 a la(s) 10:52, vincent Chaptal (
> vincent.chap...@ibcp.fr) escribió:
> 
> > Hi,
> >
> > It's hard to find a single metric...
> > Ultimately, the quality of electron density maps, lower noise in fo-fc?
> >
> > Best
> > Vincent
> >
> > Le 27/10/2021 à 17:44, Murpholino Peligro a écrit :
> >
> > Let's say I ran autoproc with different combinations of options for a
> > specific dataset, producing dozens of different (but not so different) mtz
> > files...
> > Then I ran phenix.refine with the same options for the same structure but
> > with all my mtz zoo
> > What would be the best metric to say "hey this combo works the best!"?
> > R-free?
> > Thanks
> >
> > M. Peligro
> >
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> > --
> >
> > Vincent Chaptal, PhD
> >
> > Director of GdR APPICOM
> >
> > Drug Resistance and Membrane Proteins Lab
> >
> >
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> >
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> >
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> >
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> >
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> >
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> >
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> >
> >
> >
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*--------------------------------------------------------------
* Clemens Vonrhein, Ph.D.     vonrhein AT GlobalPhasing DOT com
* Global Phasing Ltd., Sheraton House, Castle Park 
* Cambridge CB3 0AX, UK                   www.globalphasing.com
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