an><span class="va">location</span> <span class="op">==</span> <span class="st">"California"</span>, <span class="op">]</span><span class="op">)</span>, </span></span>
<span class="r-in"><span>       col <span class="op">=</span> <span class="st">"pink"</span>, main <span class="op">=</span> <span class="st">"Exercise 2.8"</span><span class="op">)</span></span></span>
<span class="r-plt img"><img src="Diesel-2.png" alt="" width="700" height="433"></span>
<span class="r-in"><span><span class="fu"><a href="ht