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On Wed, May 9, 2012 at 11:58 AM, Garib N Murshudov <[log in to unmask]> wrote: > As far as I know there are several bumps: around 3.5-4 (there are some at > low resolution related with molecular shapes also) - secondary structures, > ~2.2 related with angles and around 1.2 related with covalent bonds. For > DNA/RNA there is one more bump around 1.6-1.7 ( I thought that is because of > Phosphor bonds). They are visible with normalised data better. It has been pointed out to me that my example cut off the data at too low a resolution to see the peak for covalent bonds. Here is a different version that shows a distinctive peak around 1.15A. -Nat