 <td><p>X scale title string. Defaults to NULL, which converts to sentence case with spaces. Use "" if you would like no title.</p></td>
    </tr>
    <tr>
      <th>x_title_wrap</th>
      <td><p>Number of characters to wrap the x title to. Defaults to 50.</p></td>
    </tr>
    <tr>
      <th>x_zero</th>
      <td><p>For a numeric x variable, TRUE or FALSE of whether the minimum of the x scale is zero. Defaults to FALSE.</p></td>
    </tr>
    <tr>
      <th>x_zero_line</th>
      <td><p>For a numeric x v