title: changing font size in regression tree plot
body: <pre><code>library(rpart)
  library(rpart.plot)
  fit &lt;- rpart(Kyphosis ~ Age + Number + Start, data = kyphosis)
  prp(fit, type = 4, extra = 101, leaf.round = 1, fallen.leaves = TRUE,
      varlen = 0, tweak = 0.8)
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/PZK2T.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PZK2T.png" alt="enter image description here"></a></p>
  
  <p>I'm trying to get the text to fit inside the rounded squares. I tried lowering the <code>tweak</code> and <code>cex</code> values, but it appears that the rounded squares get smaller along with the text. How can I make the font size smaller?</p>