title: How to make offset axes in matplotlib?
body: <p>I want to create two x-axes, one below the other.</p>
  
  <p>I believe I want to base it off <a href="http://matplotlib.sourceforge.net/plot_directive/mpl_toolkits/axes_grid/figures/simple_axisartist1.py" rel="nofollow">this example</a> (which looks like <a href="http://matplotlib.sourceforge.net/mpl_toolkits/axes_grid/figures/simple_axisartist1.hires.png" rel="nofollow">this</a>), but in particular how do I draw this outside (below) the original axes region, and set major_ticks and major_ticklabels?</p>