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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