k2.json</code></li><li>A GeoJSON object, from your own Javascript code</li><li><code>null</code>, if you wish to only provide <code>options</code> and not initial data.</li></ul></td>
</tr>
<tr>
<td>options</td>
<td>object</td>
<td>If provided, it is the same options as provided to <code><a href="/mapbox.js/api/v2.1.1/l-featuregroup">L.FeatureGroup</a></code>, as well as: <ul><li><code>filter</code>: A function that accepts a feature object and returns <code>true</code> or <code>false</code> to indicate whe