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       pgmhist - print a histogram of the values in a portable graymap
       pgmhist [pgmfile]
       Reads a portable graymap as input.  Prints a histogram of the gray val-
       ues.
       pgmnorm(1), pgm(5), ppmhist(1)
       Copyright (C) 1989 by Jef Poskanzer.
                               28 February 1989                     pgmhist(1)