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1.17.1.1 background color
Most terminals now allow you to set an explicit background color for the plot. The special linetype ‘bgnd‘ will draw in this color, and ‘bgnd‘ is also recognized as a color. Examples:
# This will erase a section of the canvas by writing over it in the
# background color
set term wxt background rgb "gray75"
set object 1 rectangle from x0,y0 to x1,y1 fillstyle solid fillcolor bgnd
# This will draw an "invisible" line along the x axis
plot 0 lt bgnd
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