ステムラインとヘッドマーカーは、広範にカスタマイズできます。

ScottPlot.Plot myPlot = new();

double[] values = Generate.Sin(21);
var lollipop = myPlot.Add.Lollipop(values);

lollipop.MarkerColor = Colors.Red;
lollipop.MarkerSize = 15;
lollipop.MarkerShape = MarkerShape.FilledDiamond;

lollipop.LineColor = Colors.Green;
lollipop.LineWidth = 3;
lollipop.LinePattern = LinePattern.Dotted;

myPlot.SavePng("demo.png", 400, 300);