Thank you, Paul and Hidong, for your explanations. Here is another way of
looking at it (kindly provided by Ronald Stenkamp).
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Think of the electron density as a 3-dimensional function with an average
value of 0.0 (This is true if you have not included an F000 reflection, and
it's true of diffe
I am new to the filed of crystallography. I am having trouble figuring out
what exactly does sigma level of electron density map mean.
When sigma level of a map is increased (say from 1.5 sigma to 2 sigma) why
the map covering individual residues becomes less wide and more "precise"?
Shouldn't it
