Zeroaxis

The x axis may be drawn by set xzeroaxis and removed by unset xzeroaxis. Similar commands behave similarly for the y, x2, y2, and z axes.

Syntax:

     set {x|x2|y|y2|z}zeroaxis { {linestyle | ls <line_style>}
                                | { linetype | lt <line_type>}
                                  { linewidth | lw <line_width>}}
     unset {x|x2|y|y2|z}zeroaxis
     show {x|y|z}zeroaxis

By default, these options are off. The selected zero axis is drawn with a line of type 5#5line_type6#6 and width 5#5line_width6#6 (if supported by the terminal driver currently in use), or a user-defined style 5#5line_style6#6.

If no linetype is specified, any zero axes selected will be drawn using the axis linetype (linetype 0).

set zeroaxis is equivalent to set xzeroaxis; set yzeroaxis. Note that the z-axis must be set separately using set zzeroaxis.

Examples:

To simply have the y=0 axis drawn visibly:

      set xzeroaxis

If you want a thick line in a different color or pattern, instead:

      set xzeroaxis linetype 3 linewidth 2.5