 found in distinct
positions (defined with identifiers); includes two columns: "ID" and
"Species".</p>
    </div>

    <div class="section level2">
    <h2 id="ref-examples">Examples<a class="anchor" aria-label="anchor" href="#ref-examples"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="co"># \donttest{</span></span></span>
<span class="r-in"><span><span class="co"># Data for examples</span></span></span>
<span class="r-in"><span><span class="va">