軸線には広範なカスタマイズオプションがあります。

ScottPlot.Plot myPlot = new();

myPlot.Add.Signal(Generate.Sin());
myPlot.Add.Signal(Generate.Cos());

var vl1 = myPlot.Add.VerticalLine(24);
vl1.LineWidth = 3;
vl1.Color = Colors.Magenta;

var hl1 = myPlot.Add.HorizontalLine(0.75);
hl1.LineWidth = 2;
hl1.Color = Colors.Green;
hl1.LinePattern = LinePattern.Dashed;

var hl2 = myPlot.Add.HorizontalLine(-.23);
hl2.LineColor = Colors.Navy;
hl2.LineWidth = 5;
hl2.Text = "こんにちは";
hl2.LabelFontSize = 24;
hl2.LabelBackgroundColor = Colors.Blue;
hl2.LabelFontColor = Colors.Yellow;
hl2.LinePattern = LinePattern.DenselyDashed;

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