an class="op">(</span><span class="st">"Empirical"</span>, <span class="st">"Euclidean"</span><span class="op">)</span>,</span>
<span>  region <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="st">"sum"</span>, <span class="st">"min"</span>, <span class="st">"max"</span><span class="op">)</span>,</span>
<span>  is.angle <span class="op">=</span> <span class="cn">FALSE</span></span>
<span><span class="op"