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You can fill the plotting region (the rectangle bounded by the chart axes) with a patterned colour using:
chSet 'bgcol' 'Lime,2'
You may also set an edge-weight in points here, but this would normally be left at the default value of 0. The background is drawn from the origin to the last tickmark in the X and Y directions, so you may wish to combine this with the Framed or Clipped styles.
For the Dial chart, this colours the arc portion only, and for the Polar chart it colours the circle edged by the X-axis. For Table charts, it simply sets the background fill for the entire table.