15.64.30 GRID

This causes a grid to overlay the plot when axes are drawn. The grid lines are lined up with the large tick marks. This acts on the current plot only a new SET GRID is required for each plot or the options PERMANENT must be specified. The command must be followed by either a HIST, JOIN, BARGRAPH or PLOT command to be effective. SET GRID [ON|OFF] [Y|HORIZONTAL|X|VERTICAL!Z[=ON|OFF]] [SYMBOL[=sym]] [XY| YZ|ZX[=ON|OFF]] [CYCLE[=ON|OFF]] [OUTLINE[=ON|OFF]] [SIZE=n] [INTENSITY|WIDTH=n] [NOCOLOR|WHITE|RED|GREEN|BLUE|YELLOW|MAGENTA|CYAN] [NOTEXTURE|SOLID|DOTS|DASHES|DAASHES|DOTDASH|PATTERNED|FUNNY|SPACE] [THETA=n] [PHI=n] [ANGLE=n] [PERMANENT]