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import numpy as np
import matplotlib.pyplot as plt

t = np.arange(-1,2, .01)
s = np.sin(2*np.pi*t)

# draw a thick red hline at y=0 that spans the xrange
l = plt.axhline(linewidth=4, color='r')

# draw a default hline at y=1 that spans the xrange
l = plt.axhline(y=1)

# draw a default vline at x=1 that spans the yrange
l = plt.axvline(x=1)

# draw a thick blue vline at x=0 that spans the the upper quadrant of
# the yrange
l = plt.axvline(x=0, ymin=0.75, linewidth=4, color='b')

# draw a default hline at y=.5 that spans the the middle half of
# the axes
l = plt.axhline(y=.5, xmin=0.25, xmax=0.75)

p = plt.axhspan(0.25, 0.75, facecolor='0.5', alpha=0.5)

p = plt.axvspan(1.25, 1.55, facecolor='g', alpha=0.5)



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