ptions'>markerOptions</a></span>(), <span class='kw'>clusterOptions</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>clusterId</span> <span class='kw'>=</span> <span class='kw'>NULL</span>, <span class='kw'>labelProperty</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class='kw'>labelOptions</span> <span class='kw'>=</span> <span class='kw pkg'>leaflet</span><span class='kw ns'>::</span><span class='fu'><a href='http://www.rdocumentation.org/packages/l