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

[Veer Bhatt]

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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