title: Adding boxplot below density plot
body: <p>I'm new to ggplot and I'm trying to create this graph:</p>
  
  <p><a href="https://i.stack.imgur.com/7cJh6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7cJh6.png" alt="enter image description here"></a></p>
  
  <p>But actually, I'm just stuck here:</p>
  
  <p><a href="https://i.stack.imgur.com/vR6Wt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vR6Wt.png" alt="enter image description here"></a></p>
  
  <p>This is my code : </p>
  
  <pre><code>ggplot(diamonds)  + 
    aes(x = carat, group = cut) + 
    geom_line(stat = "density", size = 1) + 
    theme_grey() + 
    facet_wrap(~cut, nrow = 5, strip.position = "right") + 
    geom_boxplot(aes())
  </code></pre>
  
  <p>Does someone know what I can do next?</p>