observational unit across axes:</p>
<div class="sourceCode" id="cb6"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="va">flea</span> <span class="op"><a href="https://magrittr.tidyverse.org/reference/pipe.html" class="external-link">%&gt;%</a></span></span>
<span>  <span class="fu"><a href="reference/pcp_select.html">pcp_select</a></span><span class="op">(</span><span class="va">species</span>, <span class="fl">2</span><span class="op">:</span><span class="fl">7</span>, <spa