an> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='st'>"fixed"</span>, <span class='st'>"optimal"</span>)[<span class='fl'>1</span>], <span class='kw'>startRadius</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>eachRadius</span> <span class='kw'>=</span> <span class='fl'>1</span>, <span class='kw'>targetMeasure</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='st'>"RR"</spa