[phenixbb] Why the correlation coefficient of the electron density with the model is never 1?

[Murpholino Peligro]

The links below show a plot of the results of
phenix.real_space_correlation* for a nice lisozyme crystal and also the
coot view.
https://drive.google.com/open?id=0B9tqXyDsq9YIdkRhcVFXU2dEdnhINXR6Y3hza2Y5NGpNM1hV
https://drive.google.com/open?id=0B9tqXyDsq9YIREd1OFZhNGZtRnN4aldtVU1mdk84NExVX2Vn

As you can see the electron density fits very well the model.
Why not a single residue gets a perfect correlation coefficient? (i.e. 1)


Just curious.

Thanks


* phenix.real_space_correlation pdbfile mtzfile --detail="residue" > outpu
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