title: How to plot a colored surface in python?
body: <p>I have a set of data (x,y,z,w), e.g.</p>
  <pre><code>0.000000e+00 0.000000e+00 3.295487e-03 1.628957e-02
  0.000000e+00 1.010101e-02 4.637040e-03 1.627804e-02
  0.000000e+00 2.020202e-02 6.393257e-03 1.625705e-02
  0.000000e+00 3.030303e-02 8.637018e-03 1.622050e-02
  0.000000e+00 4.040404e-02 1.143315e-02 1.615969e-02
  </code></pre>
  <p>And I want to plot a colored surface like <a href="https://matplotlib.org/stable/gallery/mplot3d/surface3d.html" rel="nofollow noreferrer">https://matplotlib.org/stable/gallery/mplot3d/surface3d.html</a></p>
  <p>But with the colormap reflecting the magnitude of w instead of z.
  Any advice?</p>