setGridWidth(hGridWidth [, vGridWidth [, minorHGridWidth [, minorVGridWidth ]]])

Sets the horizontal and vertical grid line width.

Argument	Default	Description
hGridWidth	(Mandatory)	The line width for the horizontal grid lines associated with major ticks.
vGridWidth	-1	The line width for the vertical grid lines associated with major ticks. -1 means the vertical grid line width is the same as hGridWidth.
minorHGridWidth	-1	The line width for the horizontal grid lines associated with minor ticks. -1 means the color is the same as hGridWidth.
minorVGridWidth	-1	The line width for the horizontal grid lines associated with minor ticks. -1 means the color is the same as vGridWidth.

None