ScottPlot.NET
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Polar Axis Background

The background style of polar axes may be customized

ScottPlot.Plot myPlot = new();

var polarAxis = myPlot.Add.PolarAxis();
polarAxis.FillColor = Colors.Blue.WithAlpha(.2);

myPlot.SavePng("demo.png", 400, 300);
This recipe is one of many in the Polar Axis category