title: Control the font size of axis tick labels
body: <p>Probably a trivial question but nevertheless I couldn't find a straightforward answer for it online.</p>
  
  <p>Suppose I plot this data:</p>
  
  <pre><code>plot(c(1:10),rnorm(10),xaxt="n",xlab="")
  </code></pre>
  
  <p>And then I want to plot my own defined x-axis labels:</p>
  
  <pre><code>x.labs=c("a","b","c","d","e","f","g","h","i","j")
  axis(1,at=c(1:10),labels=x.labs)
  </code></pre>
  
  <p>My question is how do I adjust the font size of the labels (make <code>x.labs</code> bigger or smaller)?</p>