RULE

        [GREG1\]RULE [X] [Y] [/MAJOR] [/MINOR]

    Without an argument, or with both X and Y arguments, RULE makes  a  grid
    within  the  BOX using the current pen. Major or minor ticks or both are
    selected according to the options.  With the argument X or Y,  the  grid
    is  restricted  to  X  or  Y  ticks respectively.  The /MAJOR and /MINOR
    options can be combined in the same command.