xedh

NAME

     xedh - electron density histogram plotter

USAGE

     xedh [file.map]

DESCRIPTION

     xedh is a normalized electron-density histogram plotter.  It
     can  be  used  to  compare histograms between phase sets and
     between different crystals.  The histogram for  a  correctly
     phased  protein  with a given percent solvent and resolution
     range is characteristic.  Any deviations are  due  to  phase
     errors.    By  comparing  your phase set with those of other
     well-refined proteins in the same resolution range  you  can
     guess  the amount of phase error.  For example, when compar-
     ing  right  and  left-handed  maps  that  include  anamolous
     scattering  information  the  correct  hand  will  have  the
     sharper histogram.

     If a solvent mask in B.C Wang format exists, it can be  used
     to  separate  out  the protein and solvent components of the
     histogram.

     The histograms can be saved and loaded in the Files window.

     The methods are still being developed.  In the future  exam-
     ple  histograms  may  be  available  and more information on
     determining phase errors will be available.

POP-UP WINDOWS

     xedh has several pop-up  windows  you  can  use.   They  are
     self-explanatory.

VERSION

     Release 3.2 of XtalView

SEE ALSO

     xtalview(1)