title: Partial shade of distribution plot using Seaborn
body: <p>Following simple code:</p>
  
  <pre><code>import numpy as np
  import seaborn as sns
  dist = np.random.normal(loc=0, scale=1, size=1000)
  ax = sns.kdeplot(dist, shade=True);
  </code></pre>
  
  <p>Yields the following image:</p>
  
  <p><a href="https://i.stack.imgur.com/b8kYj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/b8kYj.png" alt="enter image description here"></a></p>
  
  <p>I would like to only shade everything right (or left to some x value). What is the simplest way? I am ready to use something other than Seaborn.</p>