e>'sum'</code> corresponds to a radial threshold
\(\sum x_i &gt; \)<code>th</code>, <code>'min'</code> to \(\min x_i &gt;\)<code>th</code> and <code>'max'</code> to \(\max x_i &gt;\)<code>th</code>.</p></dd>


<dt>is.angle</dt>
<dd><p>logical indicating whether observations are already angle with respect to <code>region</code>. Default to <code>FALSE</code>.</p></dd>

</dl></div>
    <div class="section level2">
    <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
    

<p>a