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# -----------------------------------------------------------------------------

# Copyright (c) 2015, Nicolas P. Rougier. All Rights Reserved.

# Distributed under the (new) BSD License. See LICENSE.txt for more info.

# -----------------------------------------------------------------------------

import numpy as np

import matplotlib.pyplot as plt

n = 256

X = np.linspace(-np.pi,np.pi,n,endpoint=True)

Y = np.sin(2*X)

plt.axes([0.025,0.025,0.95,0.95])

plt.plot (X, Y+1, color='blue', alpha=1.00)

plt.fill_between(X, 1, Y+1, color='blue', alpha=.25)

plt.plot (X, Y-1, color='blue', alpha=1.00)

plt.fill_between(X, -1, Y-1, (Y-1) > -1, color='blue', alpha=.25)

plt.fill_between(X, -1, Y-1, (Y-1) < -1, color='red', alpha=.25)

plt.xlim(-np.pi,np.pi), plt.xticks([])

plt.ylim(-2.5,2.5), plt.yticks([])

# savefig('../figures/plot_ex.png',dpi=48)

plt.show()