title: How can I fit a regression line in a seaborn scatterplot of order 0 (constant)?
body: <p>I have a seaborn scatter plot with a metric for different groups accross releases. I would like to fit a constant line for each group to see how they perform in comparison to each other. I tried to use the seaborn.lmplot like this:</p>
  
  <pre><code> seaborn.lmplot(x="release", y=metric, palette="PRGn", hue=hue, data=data, order=0)
  </code></pre>
  
  <p>Unfortunately, it seems that the minimum value for the parameter order is 1, therefore it fits a line of order 1 (y = ax + b) and not of order 0 (y = c). Is there a simple way to fit a constant line using seaborn?</p>