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"""

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

fill_between(x, y1, y2)

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

See `~matplotlib.axes.Axes.fill_between`.

"""

import matplotlib.pyplot as plt

import numpy as np

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

# make data

np.random.seed(1)

x = np.linspace(0, 8, 16)

y1 = 3 + 4*x/8 + np.random.uniform(0.0, 0.5, len(x))

y2 = 1 + 2*x/8 + np.random.uniform(0.0, 0.5, len(x))

# plot

fig, ax = plt.subplots()

ax.fill_between(x, y1, y2, alpha=.5, linewidth=0)

ax.plot(x, (y1 + y2)/2, linewidth=2)

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

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

plt.show()