LO' - lower 95% confidence interval surface.</p></li>
<li><p>'CHI' - upper 95% confidence interval surface.</p></li>
<li><p>'CIS' - both confidence interval surfaces.</p></li>
<li><p>'ALL' - value and both confidence interval surfaces.</p></li>
</ul><p>Defaults to 'ALL'.</p></td>
    </tr>
    <tr>
      <th>depth</th>
      <td><p>Integer from 1 to 6. The numbers correspond to the
 following depth ranges:</p><ol>
<li><p>0 to 5 cm.</p></li>
<li><p>5 to 15 cm.</p></li>
<li><p>15 to 30 cm.</p></li>
<li><p>30 