      <td><p>optional column of <code>data</code> containing the polylines, if using encoded polylines</p></td>
    </tr>
    <tr>
      <th>radius</th>
      <td><p>in metres. Default 1</p></td>
    </tr>
    <tr>
      <th>radius_min_pixels</th>
      <td><p>the minimum radius in pixels. Can prevent circle from
getting too small when zoomed out
small for the given zoom level</p></td>
    </tr>
    <tr>
      <th>radius_max_pixels</th>
      <td><p>the maximum radius in pixels. Can prevent the circle from
