span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/utils/data.html" class="external-link">data</a></span><span class="op">(</span><span class="va">ctd</span><span class="op">)</span></span></span>
<span class="r-in"><span><span class="va">p</span> <span class="op">&lt;-</span> <span class="va">ctd</span><span class="op">[[</span><span class="st">"pressure"</span><span class="op">]</span><span class="op">]</span></span></span>
<span class="r-in"><span><span class="va">y</span> <span class="o