h>digits</th>
      <td><p>number of digits for rounding coordinates</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 are displayed</p></td>
    </tr>
    </table>

    <h2 class="hasAnchor" id="details"><a class="