title: Multiindex scatter plot
body: <p>Suppose I have the following data:</p>
  
  <pre><code>data = {'Value': {('1', 1): 3.0,
  ('1', 2): 4.0,
  ('1', 3): 51.0,
  ('1', 4): 10.0,
  ('1', 5): 2.0,
  ('1', 6): 17.0,
  ('1', 7): 14.0,
  ('1', 8): 7.0,
  ('1', 9): 2.0,
  ('1', 10): 1.0}}
  df=pd.DataFrame(data)
  </code></pre>
  
  <p>Let's say this represents values for something for the first ten days in January.  I want to plot this data, so I use:</p>
  
  <pre><code>df.plot()
  plt.show()
  </code></pre>
  
  <p>Now, suppose I have another data set that has values for a subset of these dates with slightly different values but the same index values:</p>
  
  <pre><code>df1 = df[df['Value']&lt;10]
  df1['Value'] = df1['Value']*2
  </code></pre>
  
  <p>My question is, how can I overlay a scatter plot of this data on the original line graph?</p>