lass="anchor" aria-label="anchor" href="#ref-examples"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="va">surf_data</span> <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/readRDS.html" class="external-link">readRDS</a></span><span class="op">(</span>file <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/connections.html" class="external-link">url</a></span><span class="op">(</span><span class="fu