ScottPlot.NET
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Radar Legend

Collections of radar values (radar series) can be labeled so they appear in the legend

ScottPlot.Plot myPlot = new();

double[,] values = {
    { 78,  83, 84, 76, 43 },
    { 100, 50, 70, 60, 90 }
};

var radar = myPlot.Add.Radar(values);
radar.Series[0].LegendText = "Sebastian";
radar.Series[1].LegendText = "Fernando";

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