title: Plot 3D mesh in Maxima without colored surface
body: <p>I have a 1-dimensional list <code>x</code> in Maxima with 16 different elements, and plotted every possible product of two elements as a 3D plot:</p>
  
  <pre><code>g(u,v) := float('x[round(u)]*'x[round(v)]);
  plot3d(g(u,v),[u,1,16],[v,1,16],[grid,15,15]);
  </code></pre>
  
  <p>Which yields this result:</p>
  
  <p><a href="http://i.stack.imgur.com/uKwfe.png" rel="nofollow">http://i.stack.imgur.com/uKwfe.png</a></p>
  
  <p>My desired result is having <em>only</em> the contour lines, i.e. the mesh. I don't want the coloured surface.</p>
  
  <p>This seems like a trivial task, but the manual is very unclear on this. It says that usually, you already have only the mesh, but this isn't the case.</p>
  
  <p>Using wxMaxima 12.04.0 on Windows.</p>