[Chimera-users] reading in electron density map H32 vs R32

Tom Goddard goddard at sonic.net
Wed May 17 14:20:05 PDT 2017

Hi Christine,

  Chimera typically uses spacegroup information from PDB files and ignores that information in the density map files.  If you wrote a CCP4 format file (usually .map file suffix) from some other software it will put the spacegroup number in the file header (header field ispg), and will sometimes also put the symmetry operators in the header.  Chimera ignores the space group number.  It reads the symmetry operators if they are present but only uses them in limited ways, like if you use the “vop cover” command to extend an asymmetric unit map.


> On May 17, 2017, at 1:25 PM, Christine Gee wrote:
> Hi,
> I have a structure in the space group H32. I wrote out a map, which lists it as space group 155. I was wondering if chimera would read that in as space group H32 (R32:h) or as R32 (R32:r).
> Regards
> Christine
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