Item _phasing_MIR_der_shell.R_cullis

Description

              Residual factor R~cullis~ for centric reflections in this
               derivative in this shell.

                           sum| |Fph~obs~ +/- Fp~obs~| - Fh~calc~ |
               R~cullis~ = ----------------------------------------
                                   sum|Fph~obs~ - Fp~obs~|

               Fp~obs~  = the observed structure factor amplitude of the native
               Fph~obs~ = the observed structure factor amplitude of the
                          derivative
               Fh~calc~ = the calculated structure factor amplitude from the
                          heavy atom model

               sum is taken over the specified reflections

               Ref: Cullis, A. F., Muirhead, H., Perutz, M. F., Rossmann, M. G.
                    & North, A. C. T. (1961). Proc. R. Soc. A265, 15-38.

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