>title_wrap</th>
      <td><p>Number of characters to wrap the title to. Defaults to 70.</p></td>
    </tr>
    <tr>
      <th>subtitle</th>
      <td><p>Subtitle string.</p></td>
    </tr>
    <tr>
      <th>subtitle_wrap</th>
      <td><p>Number of characters to wrap the subtitle to. Defaults to 80.</p></td>
    </tr>
    <tr>
      <th>x_balance</th>
      <td><p>For a numeric x variable, add balance to the x scale so that zero is in the centre. Defaults to FALSE.</p></td>
    </tr>
    <tr>
      <th>x_