span class="op">=</span> <span class="st">"tracts"</span>,</span>
<span>    source <span class="op">=</span> <span class="st">"broadband"</span>,</span>
<span>    source_layer <span class="op">=</span> <span class="st">"tracts"</span>,</span>
<span>    fill_color <span class="op">=</span> <span class="fu">interpolate</span><span class="op">(</span></span>
<span>      column <span class="op">=</span> <span class="st">"estimate"</span>,</span>
<span>      values <span class="op">=</span> <span class="fu"><a h