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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