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import pandas as pd
import matplotlib.pyplot as plt
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y = np.row_stack((fnx(), fnx(), fnx()))
x = np.arange(10)
y1, y2, y3 = fnx(), fnx(), fnx()
fig, ax = plt.subplots()
ax.stackplot(x, y)
plt.show()
fig, ax = plt.subplots()
ax.stackplot(x, y1, y2, y3)
plt.show()