e this layer</p></td>
    </tr>
    <tr>
      <th>focus_layer</th>
      <td><p>logical indicating if the map should update the bounds to only include this layer</p></td>
    </tr>
    <tr>
      <th>transitions</th>
      <td><p>list specifying the duration of transitions.</p></td>
    </tr>
    <tr>
      <th>brush_radius</th>
      <td><p>radius of the brush in metres. Default NULL. If supplied,
the arcs will only show if the origin or destination are within the radius of the mouse.
If NULL, all arcs ar