mily</th>
      <td><p>character string indicating the fish family.</p></td>
    </tr>
    <tr>
      <th>option</th>
      <td><p>character string indicating the fish species.
If NA, the first available option within a family will be selected</p></td>
    </tr>
    <tr>
      <th>xmin</th>
      <td><p>x location giving minimum horizontal location of silhouette</p></td>
    </tr>
    <tr>
      <th>xmax</th>
      <td><p>x location giving maximum horizontal location of silhouette</p></td>
    </tr>
    <tr