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The only thing that seems to make sense is bonds rmsd - but you should
ask the annotator for specifics directly.  If it is bonds rmsd, this has
been discussed many times - just google "rmsd bonds ccp4bb" and look for
most recent entries.

On Mon, 2013-06-17 at 12:11 +0530, Faisal Tarique wrote:
> Dear all
> 
> 
> During PDB deposition the annotator me to verify and review the sigma
> value in the structure file which in my case was -0.03. I have some
> basic queries and request you all to please answer them. My first
> question is, what actually is a "sigma value" of a structure file.
> 2nd) where the value is mentioned?. 3rd) and What is the optimum sigma
> value range ?
> 
> 
> -- 
> Regards
> 
> Faisal
> School of Life Sciences
> JNU

-- 
Edwin Pozharski, PhD, Assistant Professor
University of Maryland, Baltimore
----------------------------------------------
When the Way is forgotten duty and justice appear;
Then knowledge and wisdom are born along with hypocrisy.
When harmonious relationships dissolve then respect and devotion arise;
When a nation falls to chaos then loyalty and patriotism are born.
------------------------------   / Lao Tse /