[Chimera-users] Contouring ED Map: Sigma versus Chimera thresholds

Elaine Meng meng at cgl.ucsf.edu
Wed Jan 27 16:23:42 PST 2010

Hi Veer,
This previous reply may be useful:


Elaine C. Meng, Ph.D.
UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab
Department of Pharmaceutical Chemistry
University of California, San Francisco

On Jan 27, 2010, at 4:12 PM, Veer Bhatt wrote:

> Hi,
> 	This in context of using Chimera to view *ccp4 format electron  
> density maps. How does Chimera 'Threshold Level' ('Level' in Volume  
> viewer) equate or relate to sigma level reported by some other  
> programs. For example a 'Level' of 0.4 seems like a map contoured  
> at 1.5 sigma or so.
> 	I was wondering if someone could point out how these two are  
> related, more precisely.
> Thanks
> Veer Sandeep Bhatt

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