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Item _em_map.r_value_all_data

Description

     The R-factor value compares overall agreement between the amplitudes
      of two sets of structure factors as follows:
            R= sigma || Fobs | - | Fcalc || / sigma | Fobs |
      For each reflection the magnitude of the computed difference between 
      the observed structure-factor amplitude from the native data 
      set |Fobs| and the calculated amplitude from the model in its current 
      trial location |Fcalc| is summed for all reflections and divided by
      the sum of the observed structure factors. 

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