title: Plotting Horizontal Line Using Subplots Matplotlib
body: <p>I have looked at the following thread and it has helped, but I was wondering if anyone had attempted it in a slightly different way.</p>
  
  <p><a href="https://stackoverflow.com/questions/21129007/plotting-a-horizontal-line-on-multiple-subplots-in-python-using-pyplot/21129112#21129112">Plotting a horizontal line on multiple subplots in python using pyplot</a></p>
  
  <p>Below is what the data looks like so you can test (if necessary) = <strong>ctr_df</strong></p>
  
  <p>Snippet of the data can be found below:</p>
  
  <pre><code>Date        LAL_3%      Core        Page_1      Homepage
  4/06/2017   0.288142    0.947993    1.174094    0.26622
  11/06/2017  0.270052    0.919648    0.615855    0.206031
  18/06/2017  0.260225    0.941274    0.550324    0.230775
  25/06/2017  0.345208    0.867322    0.373997    0.205385
  2/07/2017   0.318578    1.687208    0.420367    0.235314
  9/07/2017   0.45653     1.227451    0.71128     0.455536
  16/07/2017  0.543492    1.086996    0.415289    0.44763
  23/07/2017  0.503581    1.010364    0.642291    0.317182
  30/07/2017  0.373479    0.918334    0.580428    0.282783
  </code></pre>
  
  <p>My code is below:</p>
  
  <pre><code>ctr_df.plot(kind='bar', sharey=False, sharex=True, subplots=True, 
                                      legend=True, width=0.8, layout=(2,2), fontsize=12, grid=True, figsize=(20,12), colormap='Dark2')
  
  plt.axhline(0.3, color='k', linestyle='--')
  plt.tight_layout()
  plt.show()
  </code></pre>
  
  <p>This returns exactly what I want (individual subplots by audience, by week), however, the axhline is only appearing on the <strong>last</strong> plot, not all of them. </p>
  
  <p>Can this be done using my approach? I can't find anything to suggest it can. If this is not possible with this approach, that's fine, I can use the above thread to help revise my code.</p>
  
  <p>Thanks</p>