[Chimera-users] reporting sigma values for electron density maps

Elaine Meng meng at cgl.ucsf.edu
Tue May 20 15:49:39 PDT 2008

Hi David,
The Tools menu in Volume Viewer includes "Volume Mean, SD, RMS" to  
report statistics for the current set of data.

You probably want to make sure the whole map is displayed with step  
size 1 beforehand.
I hope this helps,
Elaine C. Meng, Ph.D.                          meng at cgl.ucsf.edu
UCSF Computer Graphics Lab and Babbitt Lab
Department of Pharmaceutical Chemistry
University of California, San Francisco

On May 20, 2008, at 2:43 PM, David Chenoweth wrote:

> Hi!
> Can you please let me know if there is a way to report or set the
> sigma value for an electron density map from a high resolution crystal
> structure. I am using a ccp4 FWT.map and DELFWT.map file for
> structures <1.2 angstrom resolution. Can I somehow find the sigma
> value that corresponds to the Level setting in the Volume viewer?
> Thanks,
> Dave Chenoweth

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