title: Split up plot axis labels on multiple lines
body: <p>I have the following graph produced in R:</p>
  
  <p><img src="https://i.stack.imgur.com/WJsK6.png" alt="enter image description here"></p>
  
  <p>On the Y axis I have the protein name along with the file name ending in .pdb. How do I make the protein name on one line and the file name on the next line?</p>
  
  <p>I used the following commands to generate the plot:</p>
  
  <pre><code>library(lattice) &lt;br&gt;
  data &lt;- read.table("~/Documents/R/test.txt", header=F, sep="\t") &lt;br&gt;
  dotplot(V1~V2, xlim=c(0, 2.5), xlab="RMSD Distribution", data=data)
  </code></pre>
  
  <p>An example input file looks as follows:</p>
  
  <pre><code>Serum Amyloid P Pentamer: 1sac.pdb  0.7125  &lt;br&gt;
  Serum Amyloid P Pentamer: 1sac.pdb  0.7917  &lt;br&gt;
  Serum Amyloid P Pentamer: 1sac.pdb  0.7819  &lt;br&gt;
  Serum Amyloid P Pentamer: 1sac.pdb  0.7762  &lt;br&gt;
  Serum Amyloid P Pentamer: 1sac.pdb  1.0233  &lt;br&gt;
  Serum Amyloid P Pentamer: 1sac.pdb  0.6896  &lt;br&gt;
  </code></pre>
  
  <p>The tab between the value and the file is not shown.</p>