title: Multi-line y label in plot
body: <p>Is there a way to create multi-line labels for the y axis in an R plot?</p>
  
  <p>I have tried adding a <code>\n</code> where the newline should be, but then the first line of the label gets clipped:</p>
  
  <pre><code>l &lt;- 10
  plot(0:l, (0:l), type='l',
       yaxt='n',
       xlab='Index',
       ylab='Cumulative sum\nof the sorted weights')
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/fMaRl.png" alt="Result of plot"></p>
  
  <p>This happens both with the <code>tikzDevice</code> and inside RStudio. Also, I tried some of the <code>par()</code> options with no luck. How to do it properly?</p>
  
  <p>(The oversized uper margin bothers me, too...)</p>