rg/packages/leaflet/topics/iconList'>iconList</a></code></p></td>
    </tr>
    <tr>
      <th>clusterOptions</th>
      <td><p>if not <code>NULL</code>, markers will be clustered using
<a href='https://github.com/Leaflet/Leaflet.markercluster'>Leaflet.markercluster</a>;
 you can use <code><a href='http://www.rdocumentation.org/packages/leaflet/topics/map-options'>markerClusterOptions</a>()</code> to specify marker cluster
options</p></td>
    </tr>
    <tr>
      <th>clusterId</th>
      <td><p>the id for 