ius</th>
      <td><p>value in pixels of each point. Default 10.</p></td>
    </tr>
    <tr>
      <th>fill_colour</th>
      <td><p>column of <code>data</code> or hex colour for the fill colour.
If using a hex colour, use either a single value, or a column of hex colours  on <code>data</code></p></td>
    </tr>
    <tr>
      <th>fill_opacity</th>
      <td><p>Either a string specifying the column of <code>data</code>
containing the opacity of each shape, or a single value in [0,255], or [0, 1),
to be appl