 use display the data</p></td>
    </tr>
    <tr>
      <th>position</th>
      <td><p>Position adjustment, either as a string, or the result of
a call to a position adjustment function.</p></td>
    </tr>
    <tr>
      <th>na.rm</th>
      <td><p>If <code>FALSE</code>, the default, missing values are removed with
a warning. If <code>TRUE</code>, missing values are silently removed.</p></td>
    </tr>
    <tr>
      <th>show.legend</th>
      <td><p>logical. Should this layer be included in the legends?
<c