. If a hex-string is used as the
colour, this argument is ignored and you should include the alpha on the hex string</p></td>
    </tr>
    <tr>
      <th>stroke_colour</th>
      <td><p>variable of <code>data</code> or hex colour for the stroke. If used,
<code>elevation</code> is ignored.
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>stroke_width</th>
      <td><p>width of the stroke in meters. If used, <code>elevati