title: combine different seaborn facet grids into single plot
body: <p>I have three different data sets where I produce a facetplot, each</p>
  
  <pre><code>a = sns.FacetGrid(data1, col="overlap",  hue="comp")
  a = (g.map(sns.kdeplot, "val",bw=0.8))
  
  b = sns.FacetGrid(data2, col="overlap",  hue="comp")
  b = (g.map(sns.kdeplot, "val",bw=0.8))
  
  c = sns.FacetGrid(data3, col="overlap",  hue="comp")
  c = (g.map(sns.kdeplot, "val",bw=0.8))
  </code></pre>
  
  <p>Each of those plots has three subplots in one row, so in total I have nine plots.</p>
  
  <p>I would like to combine these plots, in a subplots setting like this</p>
  
  <pre><code>f, (ax1, ax2, ax3) = plt.subplots(3,1)
  ax1.a
  ax2.b
  ax3.c
  </code></pre>
  
  <p>How can I do that?</p>