import numpy as np
import matplotlib.pyplot as plt

x = np.arange(10)
y = np.random.random(10)
y2 = np.random.random(10)
y3 = np.random.random(10)

y[5] = 0
y3[5] = 0

fig, ax = plt.subplots(3,2, figsize=(12,8))

ax[0,0].stackplot(x, y, baseline='sym')
ax[0,1].stackplot(x, y, baseline='weighted_wiggle')
ax[1,0].stackplot(x, y, y2, baseline='sym')
ax[1,1].stackplot(x, y, y2, baseline='weighted_wiggle')
ax[2,0].stackplot(x, y, y3, baseline='sym')
ax[2,1].stackplot(x, y, y3, baseline='weighted_wiggle')

ax[0,0].set_title('sym: no problem')
ax[0,1].set_title('failed: stops after zero `y` (x>4)')
ax[1,1].set_title('success: non-zero `y2` saves the day')
ax[2,1].set_title('failed: stops after zero `y` and `y3` (x>4)')

plt.tight_layout()
plt.show()