title: matplotlib: continuous colormap fill between two lines
body: <p>It's possible to fill between lines with a color:</p>
  
  <p><a href="http://matplotlib.sourceforge.net/examples/pylab_examples/fill_between_demo.html">http://matplotlib.sourceforge.net/examples/pylab_examples/fill_between_demo.html</a></p>
  
  <p>It's also possible to use a continuous colormap for a line:</p>
  
  <p><a href="http://matplotlib.sourceforge.net/examples/pylab_examples/multicolored_line.html">http://matplotlib.sourceforge.net/examples/pylab_examples/multicolored_line.html</a></p>
  
  <p>Is it possible (and reasonably easy) to use a continuous colormap for the colored fill between two lines?  For example, the color fill may change along x based on the difference between the two lines at x (or based on another set of data).</p>