ring colour to use for highlighting. Must contain the alpha component.</p></td>
    </tr>
    <tr>
      <th>light_settings</th>
      <td><p>list of light setting parameters. See <a href='light_settings.html'>light_settings</a></p></td>
    </tr>
    <tr>
      <th>layer_id</th>
      <td><p>single value specifying an id for the layer. Use this value to
distinguish between shape layers of the same type. Layers with the same id are likely
to conflict and not plot correctly</p></td>
    </tr>
    <tr>
      