Re: [ccp4bb] X-Ray versus NMR Structure

[Mark J. van Raaij]

although I agree with the statement below, I would say that X-ray  
crystallography also only generates a molecular model (not "a  
structure"). Rather than a structure, X-ray crystallography generates  
an electron density map. The quality of the model based in it depends  
on the quality of this electron density map (esp. resolution) and the  
quality of the researchers interpretation of it.
Mark

As a physical principle, spectroscopic
methods do not deliver atomic resolution structures, but a set of
inferences that may or may no be compatible with a molecular model.