title: place a colorbar label above horizontal colorbar (instead of below)
body: <p>I'm generating a horizontal colorbar with this code:</p>
  
  <pre><code>cbaxes = fig.add_axes([0.05, 0.15, 0.9, 0.025]) # setup colorbar axes.
  cb = fig.colorbar(cax=cbaxes, mappable=mappable, orientation='horizontal',)
  cb.set_label(r"$[10^{14}\ molec\,cm^{-2}]$", fontname='Arial', fontsize='small')
  cbytick_obj = plt.getp(cb.ax.axes, 'xticklabels')
  plt.setp(cbytick_obj, color='r', fontsize='x-small')
  cb.ax.set_yticks(arange(vmin, vmax, 2), size='small')
  </code></pre>
  
  <p>However, I want the label be printed above the colorbar (instead of below). How can I do that?</p>