th>doc</th>
      <td><p>document object</p></td>
    </tr>
    <tr>
      <th>...</th>
      <td><p>further arguments passed to other methods</p></td>
    </tr>
    <tr>
      <th>landscape</th>
      <td><p>logical value. Specify TRUE to get a section with horizontal page.</p></td>
    </tr>
    <tr>
      <th>ncol</th>
      <td><p><code>integer</code> number to specify how many columns the section should contains.</p></td>
    </tr>
    <tr>
      <th>space_between</th>
      <td><p>width in inches of t