いくつかの線パターンを利用できます

ScottPlot.Plot myPlot = new();

List<LinePattern> patterns = [];
patterns.AddRange(LinePattern.GetAllPatterns());
patterns.Add(new([2, 2, 5, 10], 0, "カスタム"));

ScottPlot.Palettes.ColorblindFriendly palette = new();

for (int i = 0; i < patterns.Count; i++)
{
    double yOffset = patterns.Count - i;
    double[] xs = Generate.Consecutive(51);
    double[] ys = Generate.Sin(51, offset: yOffset);

    var sp = myPlot.Add.Scatter(xs, ys);
    sp.LineWidth = 2;
    sp.MarkerSize = 0;
    sp.LinePattern = patterns[i];
    sp.Color = palette.GetColor(i);

    var txt = myPlot.Add.Text(patterns[i].Name, 51, yOffset);
    txt.LabelFontColor = sp.Color;
    txt.LabelFontSize = 22;
    txt.LabelBold = true;
    txt.LabelAlignment = Alignment.MiddleLeft;
}

myPlot.Axes.Margins(.05, .5, .05, .05);

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