On Apr 16, 2009, at 1:18 AM, Leiman Petr wrote:
> I am not sure if it possible to understand _anything_ in
> crystallography if it is not clear how to calculate an angle between
> two vectors!
More difficult is deciding exactly how to define said vectors in the
first place, especially when one is attempting to define said vectors
for helices "of different subunit[s] in different orientation[s]".
James
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