              Data items in the REFINE_HIST category record details about the\
               various steps along the way in the refinement of the structure.\
               These data items are not meant to be as thorough a description\
               of the refinement as is provided for the final model in other\
               categories; rather, these data items provide a mechanism for\
               sketching out the progress of the refinement, supported by a\
               small set of representative statistics.