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.