              Residual factor Rmerge for all reflections that satisfy the\
               resolution limits established by _reflns_shell.d_res_high and\
               _reflns_shell.d_res_low.\
\
                           sum~i~(sum~j~|F~j~ - <F>|)\
               Rmerge(F) = --------------------------\
                                sum~i~(sum~j~<F>)\
\
               F~j~ = the amplitude of the jth observation of reflection i\
               <F>  = the mean of the amplitudes of all observations of\
                      reflection i\
\
               sum~i~ is taken over all reflections\
               sum~j~ is taken over all observations of each reflection