[Chimera-users] saving maps generated with molmap - origin?

Tom Goddard goddard at cgl.ucsf.edu
Tue Aug 19 16:51:16 PDT 2008

Hi Greg,

  If you add the file suffix ".map" then Chimera will interpret the file 
as a CCP4 map which is slightly different than MRC format.  The most 
important difference is that MRC has the floating point origin 
specification while CCP4 does not.  You can open a file with ".map" 
suffix in Chimera as an MRC file by choosing "All (ask type)" for the 
File Type menu in the Chimera File / Open dialog.  Or if you open the 
file from the Chimera command line use the prefix "mrc:", for example 
Chimera command "open mrc:myfile.map".  Simplest just to use the ".mrc" 
suffix when you save the file.

  Look at section 5 of the following MRC documentation for the MRC 2000 
format spec.



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