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

[Elaine Meng]

Hi David,
The Tools menu in Volume Viewer includes "Volume Mean, SD, RMS" to  
report statistics for the current set of data.
http://www.cgl.ucsf.edu/chimera/docs/ContributedSoftware/volumeviewer/ 
volstats.html

You probably want to make sure the whole map is displayed with step  
size 1 beforehand.
I hope this helps,
Elaine
-----
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
                      http://www.cgl.ucsf.edu/home/meng/index.html

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
>