">flowlines</span><span class="op">[</span><span class="va">flowlines</span><span class="op">$</span><span class="va">COMID</span> <span class="op"><a href="https://rdrr.io/r/base/match.html" class="external-link">%in%</a></span> <span class="va">indexes</span><span class="op">$</span><span class="va">COMID</span>,<span class="op">]</span><span class="op">)</span><span class="op">)</span>, </span>
<span>     col <span class="op">=</span> <span class="st">"grey"</span>, lwd <span class="op">=</span> <span cl