/walker-data.com/mapgl/reference/add_vector_source.html" class="external-link">add_vector_source</a></span><span class="op">(</span></span>
<span>    id <span class="op">=</span> <span class="st">"broadband"</span>,</span>
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<span>  <span class="op">)</span> <span class="op">|&gt;</span> </span>
<span>  <span class="fu"><a href="https://walker-data.com/mapgl/reference/add_fill_layer.html" class="external-