title: axvline and axhline in a loop for multiple subplots
body: <p>I have a 16 subplots and want to include following in each subplot:</p>
  
  <pre><code>ax1.axvline(x=0.5, ymin=0.0, ymax=1.0, color='k', linestyle='--', alpha=0.3)
  ax1.axhline(y=0.5, xmin=0.0, xmax=1.0, color='k', linestyle='--', alpha=0.3)
  </code></pre>
  
  <p>Running a loop to have them for all subplots seems more feasible rather to have 32 lines, but simple string concatenation isn't working such as </p>
  
  <pre><code>for i in xrange(1,17,1):
      # then try to use i for each ax -- this isn't practical
  </code></pre>
  
  <p>Any suggestions?</p>