"op">=</span> <span class="st">"lightgreen"</span><span class="op">)</span></span></span>
<span class="r-plt img"><img src="Toxic-4.png" alt="" width="700" height="433"></span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/base/tapply.html" class="external-link">tapply</a></span><span class="op">(</span><span class="va">Toxic</span><span class="op">$</span><span class="va">sites</span>, <span class="va">Toxic</span><span class="op">$</span><span class="va">region</span>, <span class="