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Default: GRID 10 10 wxmin wxmax wymin wymax
(w.... = current window boundaries)
Draw grid lines on the window, or a rectangular portion thereof, using
the current line style and width, dividing it into nxcells cells along
the x axis and nycells cells along the y axis. If only one parameter,
nxcells, is given, then that is the value assumed for nycells. If the
rectangle boundaries are omitted, the defaults are the current window
boundaries. Values less than 1 suppress the grid lines cutting the
corresponding axis. Thus GRID 1 and GRID 1 1 will draw a box around
the window, GRID 2 0 will draw 3 equally-spaced vertical lines, and
GRID 0 4 will draw 5 equally-spaced horizontal lines.