=</span> <span class='st'>"rollapply"</span>, <span class='kw'>smoothfactor</span> <span class='kw'>=</span> <span class='fl'>15</span>, <span class='kw'>adjust</span> <span class='kw'>=</span> <span class='fl'>10</span>,
  <span class='kw'>groove_cutoff</span> <span class='kw'>=</span> <span class='fl'>400</span>, <span class='kw'>mean_left</span> <span class='kw'>=</span> <span class='kw'>NULL</span>, <span class='kw'>mean_right</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
  <span class=