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Item _refine.pdbx_real_space_R

Description

      Real space R factor of electron density for all atoms.

      The real space R factor is calculated by the equation

      R_real = [Sum~i (|Dobs - Dcal|)]/[Sum~i (|Dobs + Dcal|)]

      Where:
         Dobs is the observed  electron density,
         Dcal is the calculated  electron density,
              summation is for all the grid points

      Ref: Branden, C.I. & Jones, T.A. (1990).  Nature, 343, 687-689

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