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(gnuplot.info)grid

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 The `set grid` command allows grid lines to be drawn on the plot.

 Syntax:
       set grid {{no}{m}xtics} {{no}{m}ytics} {{no}{m}ztics}
                {{no}{m}x2tics} {{no}{m}y2tics}
                {polar {<angle>}}
                { {linestyle <major_linestyle>}
                  | {linetype | lt <major_linetype>}
                    {linewidth | lw <major_linewidth>}
                  { , {linestyle | ls <minor_linestyle>}
                      | {linetype | lt <minor_linetype>}
                        {linewidth | lw <minor_linewidth>} } }
       set nogrid
       show grid

 The grid can be enabled and disabled for the major and/or minor tic
 marks on any axis, and the linetype and linewidth can be specified
 for major and minor grid lines, also via a predefined linestyle, as
 far as the active terminal driver supports this.

 Additionally, a polar grid can be selected for 2-d plots---circles are drawn
 to intersect the selected tics, and radial lines are drawn at definable
 intervals.  (The interval is given in degrees or radians ,depending on the
 `set angles` (Note: angles ) setting.)  Note that a polar grid is no longer
 automatically generated in polar mode.

 The pertinent tics must be enabled before `set grid` can draw them; `gnuplot`
 (Note: gnuplot ) will quietly ignore instructions to draw grid lines at
 non-existent tics, but they will appear if the tics are subsequently enabled.

 If no linetype is specified for the minor gridlines, the same linetype as the
 major gridlines is used.  The default polar angle is 30 degrees.

 By default, grid lines are drawn with half the usual linewidth. The major and
 minor linewidth specifiers scale this default value; for example, `set grid
 lw .5` will draw grid lines with one quarter the usual linewidth.

 Z grid lines are drawn on the back of the plot.  This looks better if a
 partial box is drawn around the plot---see `set border` (Note: border ).