

   GGrraayy LLeevveell SSppeecciiffiiccaattiioonn

        gray(level)

   VVaalluuee::

        This function creates ``colors'' corresponding to the
        given level of gray.  The level must lie between zero
        and one, with zero indicating `"black"' and one indi-
        cating `"white"'.

        The values returned by `gray' can be used with a `col='
        specification in graphics functions or in `par'.

   SSeeee AAllssoo::

        `rainbow', `hsv', `rgb'.

   EExxaammpplleess::

        gray(0:8 / 8)

