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Item _refine.correlation_coeff_Fo_to_Fc

Description

              The correlation coefficient between the observed and
               calculated structure factors for reflections included in
               the refinement.

               The correlation coefficient is scale-independent and gives
               an idea of the quality of the refined model.

                            sum~i~(Fo~i~ Fc~i~ - )
  R~corr~ = ------------------------------------------------------------
            SQRT{sum~i~(Fo~i~)^2^-^2^} SQRT{sum~i~(Fc~i~)^2^-^2^}

               Fo = observed structure factors
               Fc = calculated structure factors
               <>   denotes average value

               summation is over reflections included in the refinement

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