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);
}