fill_between(x, height - l[1], height, color=colors[1], alpha=alpha)

def main():
    x = np.linspace(0, np.pi * 4, 137)
y = 2 * np.random.normal(size=137) + x ** 2
xx = np.hstack([-1 * x[::-1], x])
yy = np.hstack([-1 * y[::-1], y])
horizonPlot(xx, yy)
show()
Implementing horizon charts in matplotlib