title: Multiple arguments for "face" in element_text
body: <p>I am adding aesthetics to a plot in R using themes in ggplot2.  I would like to make the x axis text both bold and italic.</p>
  
  <p>I know I can use:</p>
  
  <pre><code>theme(axis.text.x = element_text(face ="bold"))
  </code></pre>
  
  <p>to make the axis text bold and:</p>
  
  <pre><code>theme(axis.text.x = element_text(face ="italic"))
  </code></pre>
  
  <p>to make it italic. </p>
  
  <p>But how would I make it both bold and italic?</p>
  
  <p>None of these do the job</p>
  
  <pre><code>theme(axis.text.x = element_text(face ="italic", "bold"))
  theme(axis.text.x = element_text(face =c("bold", "italic")))
  theme(axis.text.x = element_text(face = "bold", face = "italic"))
  theme(axis.text.x = element_text(face = "bold" &amp; "italic"))
  </code></pre>
  
  <p>Any help appreciated.</p>