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"""

===============

stackplot(x, y)

===============

Draw a stacked area plot or a streamgraph.

See `~matplotlib.axes.Axes.stackplot`

"""

import matplotlib.pyplot as plt

import numpy as np

plt.style.use('_mpl-gallery')

# make data

x = np.arange(0, 10, 2)

ay = [1, 1.25, 2, 2.75, 3]

by = [1, 1, 1, 1, 1]

cy = [2, 1, 2, 1, 2]

y = np.vstack([ay, by, cy])

# plot

fig, ax = plt.subplots()

ax.stackplot(x, y)

ax.set(xlim=(0, 8), xticks=np.arange(1, 8),

ylim=(0, 8), yticks=np.arange(1, 8))

plt.show()