 4    3    6 </span></span>
<span><span class="co">#  attr(,"class")</span></span>
<span><span class="co">#  [1] "bbox"</span></span>
<span></span>
<span><span class="va">x</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame</a></span><span class="op">(</span>x <span class="op">=</span> <span class="fl">1</span><span class="op">:</span><span class="fl">3</span>, y <span class="op">=</span> <span class="fl">4</span><span clas