><span class="co">## 4      0   1012.2    10 1357030800</span></span>
<span><span class="co">## 5      0   1011.9    10 1357034400</span></span></code></pre>
<div class="sourceCode" id="cb30"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="va">wind_dir_ds</span> <span class="op">&lt;-</span> <span class="va">flights.grp</span><span class="op">[[</span><span class="st">"wind_dir"</span><span class="op">]</span><span class="op">]</span></span>
<span><span class="va">wind_dir_d