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Most terminals 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
2016-10-19