help with sigma value in electronic maps

valmir at valmir at
Thu Sep 14 07:02:53 EST 2000

Hi people.
I would like to understand better the significance of the parameter sigma
in electronic density maps of proteins crystallographyc structures. How
the choose of different values alter the map? What is the difference
between two maps with different sigma values?
Any help in that regard would be greatly appreciated.

Valmir Fadel

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