span><span class="op">(</span></span>
<span>    <span class="va">len</span> <span class="op">~</span> <span class="va">dose</span> <span class="op">+</span> <span class="va">supp</span>,</span>
<span>    <span class="va">ToothGrowth</span>,</span>
<span>    plotLayout  <span class="op">=</span> <span class="st">"bar"</span></span>
<span><span class="op">)</span></span></code></pre></div>
<p>then add to <code>t</code> the labels with</p>
<div class="sourceCode" id="cb2"><pre class="downlit sourceCode r">
<co