              The value of Rmerge(I) for reflections classified as 'observed'\
               (see _reflns.observed_criterion) in a given shell.\
\
                           sum~i~(sum~j~|I~j~ - <I>|)\
               Rmerge(I) = --------------------------\
                               sum~i~(sum~j~<I>)\
\
               I~j~ = the intensity of the jth observation of reflection i\
               <I>  = the mean of the intensities of all observations of\
                      reflection i\
\
               sum~i~ is taken over all reflections\
               sum~j~ is taken over all observations of each reflection