title: Display the legend inside the graph when wrapping with ggplot2
body: <p>How can I do...</p>
  
  <p><a href="https://i.stack.imgur.com/Onvcv.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Onvcv.jpg" alt="legend is in a spare corner of a small multiple"></a></p>
  
  <p>... instead of the default ...</p>
  
  <p><a href="https://i.stack.imgur.com/X29Vr.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/X29Vr.jpg" alt="enter image description here"></a></p>
  
  <p>?</p>