 <tr>
      <th>ring.data</th>
      <td><p>A matrix or array produced by <code><a href='ring_detect.html'>ring_detect</a></code>.</p></td>
    </tr>
    <tr>
      <th>del</th>
      <td><p>A numeric vector giving the border numbers to be removed.</p></td>
    </tr>
    <tr>
      <th>del.u</th>
      <td><p>A numeric vector giving the border numbers to be removed 
on the upper path.</p></td>
    </tr>
    <tr>
      <th>del.l</th>
      <td><p>A numeric vector giving the border numbers to be removed 
on t