SetDrawXGrid — Whether or not to draw the X grid lines
$plot->SetDrawXGrid([$dxg
])
SetDrawXGrid
enables or disables the drawing of the X
grid lines. (The X grid lines are the vertical lines which intersect the
X axis and are parallel to the Y axis.)
The default is to not draw the X grid for vertical plots,
and to draw the X grid for horizontal plots.
$dxg
True to draw the X grid lines, False to not draw the X grid lines. If this parameter is omitted or NULL, the default behavior is restored.
Grid lines are drawn at tick mark positions.
SetLightGridColor sets the color of the grid lines.
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