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Filling between curves with color gradient or cmap in Matplotlib

I was trying to plot fill_between () in matplotlib with color gradient or any cmap defined in pyplot. 
After googleing a lot i couldn't find any solution. 

 An alternative method is to use imshow() .
I have created this example : 
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.path import Path
from matplotlib.patches import PathPatch

xx=np.arange(0,10,0.01)
yy=xx*np.exp(-xx)

path = Path(np.array([xx,yy]).transpose())
patch = PathPatch(path, facecolor='none')
plt.gca().add_patch(patch)

im = plt.imshow(xx.reshape(yy.size,1),  cmap=plt.cm.Reds,interpolation="bicubic",
                origin='lower',extent=[0,10,-0.0,0.40],aspect="auto", clip_path=patch, clip_on=True)
#im.set_clip_path(patch)
plt.savefig("out.png")

Source: Matplotlib Example
 http://matplotlib.org/examples/pylab_examples/image_clip_path.html
 
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