"ref-arguments">
    <colgroup><col class="name" /><col class="desc" /></colgroup>
    <tr>
      <th>ls</th>
      <td><p>A list with entries <code>$feature</code> (a character string describing
what summary was obtained), <code>$result</code> (the result of the summary, either
a value from the variable, a numeric or a character string) and 
<code>$value</code> (the result in its most raw format, often identical to the 
<code>$result</code> input).</p></td>
    </tr>
    </table>
    
    <h2 class="hasAnc