lit sourceCode r">
<code class="sourceCode R"><span class="co"># variables are checked</span>
<span class="fu"><a href="https://rdrr.io/r/base/colnames.html" class="external-link">colnames</a></span><span class="op">(</span><span class="va">sw</span><span class="op">)</span></code></pre></div>
<pre><code> [1] "Wreck.ID"                "Strauss.ID"              "Name"                   
 [4] "Parker.Number"           "Sea.area"                "Country"                
 [7] "Region"                  "Latitude