title: R histogram with multiple populations
body: <p>I'm interested in creating a histogram in R that will contain two (or more) population on top of each other, meaning - I don't want a two histograms sharing the same graph but a bar containing two colors or more.</p>
  
  <p>Found the image below - this is what I want to accomplish. </p>
  
  <p><a href="https://i.stack.imgur.com/dvDBY.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/dvDBY.jpg" alt="example"></a></p>
  
  <p>Any ideas? </p>