              The mean lack-of-closure error loc for reflections in this\
               derivative in this shell.\
\
               loc = sum|Fph~obs~ - Fph~calc~|\
\
               Fph~obs~  = the observed structure factor amplitude of the\
                           derivative\
               Fph~calc~ = the calculated structure factor amplitude of the\
                           derivative\
\
               sum is taken over the specified reflections