title: Change the size of histogram labels
body: <p>Base graphing, some dummy data to state my case:</p>
  
  <pre><code>dat &lt;- rnorm(n = 1000, m = 0, sd = 1) 
  hist(dat, breaks = 5, labels = TRUE, freq = TRUE, main = "Title")
  </code></pre>
  
  <p>I added labels of the bins. Now, I'd like to change their size. I know a lot can be done with <code>cex</code> parameters:</p>
  
  <pre><code>hist(dat, breaks=5, labels = TRUE, freq = TRUE, main = "Title", cex.main = 0.5)
  </code></pre>
  
  <p>However it doesn't seem to handle the bar labels.</p>
  
  <p>Any solution for that?</p>