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"""
============================================================================
Demonstrates plotting contour (level) curves in 3D using the extend3d option
============================================================================
This modification of the contour3d_demo example uses extend3d=True to
extend the curves vertically into 'ribbons'.
"""
from mpl_toolkits.mplot3d import axes3d
import matplotlib.pyplot as plt
from matplotlib import cm
fig = plt.figure()
ax = fig.gca(projection='3d')
X, Y, Z = axes3d.get_test_data(0.05)
cset = ax.contour(X, Y, Z, extend3d=True, cmap=cm.coolwarm)
ax.clabel(cset, fontsize=9, inline=True)
plt.show()
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