Adds a background to the meter scale.
In the example below, the sky blue background with the dark blue border is the scale background.
The scale background is a circle segment (a circle with a part cut-off by a chord). Its radius is usually configured as larger than that of the meter scale. In this case, its angular span will also be larger than that of the meter scale. In the above sample, the meter scale spans 180 degrees. The scale background spans more than 180 degrees so that it can maintain a margin at the bottom side (the chord side).
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