public void ExecuteRecipe(Plot plt) { // create sample data Random rand = new Random(3); double[] xs = DataGen.Consecutive(201); double[] ys = DataGen.RandomWalk(rand, xs.Length); // add filled polygons plt.AddFillAboveAndBelow(xs, ys); // tighten the axis limits so we don't see lines on the edges plt.SetAxisLimits(xMin: 0, xMax: 200); }