XGRID

Syntax: | `SET XGRID n GET XGRID { n }`
Default value: | `XGRID = 0`

`XGRID` controls the number of grid lines parallel to the y-axis. `XGRID` specifies the number of large, labeled, x-axis tic marks between each grid line.

`XGRID` | meaning
> 0 | draw a grid line parallel to the y-axis at every `XGRID` large tic mark, starting with the first.
= 0 | suppress all grid lines parallel to the y-axis.
= -1 | draw a grid line parallel to the y-axis at every x-axis tic mark, large and small. This option applies only if the axes are orthogonal.

See `GRIDLINETYPE` for information on changing the line type for the grid lines.