title: Powers on R plot
body: <p>I have a plot in R and one of my axes is labeled as <code>z^2</code></p>
  
  <pre><code>plot(log(b)~a, data=dat, pch=15, xlab="time", ylab="log(z^2)")
  </code></pre>
  
  <p>Is it possible to write power in R without symbol "^" ?</p>