Use the fill function to make shaded regions of any color tint. Here is an example.

In [1]:
from pylab import *

x = arange(10)
y = x

# Plot junk and then a filled region
plot(x, y)

# Make a blue box that is somewhat see-through
# and has a red border.
# WARNING: alpha doesn't work in postscript output....
fill([3,4,4,3], [2,2,4,4], 'b', alpha=0.2, edgecolor='r')

Out[1]:
[<matplotlib.patches.Polygon at 0x7f7a19aac890>]

Section author: jesrl

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