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
