2.40                      *******************
                                  * PSTATS WRITE-UP *
                                  *******************


           PSTATS (Phase Statistics) is a program to compute and tabulate
        mean phase differences between two phase sets as a function of
        d spacing. The program is interactive and prompts for the 
        parameter file and the names of two phase files. The phase files
        can be either the long or short forms (as produced from PHASIT,
        BNDRY, or GREF), or even one of each. Reflections need not be
        indexed identically in both files, but each file should contain
        only unique reflections. The statistics enable one to determine
        how different two phase sets are. When combining experimental
        phase information with that obtained from a partial structure,
        it may be useful to monitor these statistics and use them to
        adjust the damping factor defining relative weights between
        the two sources of information. 


                                   ***** FILES *****


        INPUT FILES  - Binary "phased" files, either in long or short
                       format as produced by PHASIT, BNDRY or GREF.