YGRID

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

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

`YGRID` | meaning
> 0 | draw a grid line parallel to the x-axis at every `YGRID` large tic mark, starting with the first.
= 0 | suppress all grid lines parallel to the x-axis.
= -1 | draw a grid line parallel to the x-axis at every y-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.