an>,
  geom <span class='op'>=</span> <span class='st'>"ribbon"</span>,
  position <span class='op'>=</span> <span class='st'>"identity"</span>,
  <span class='va'>...</span>,
  na.rm <span class='op'>=</span> <span class='cn'>FALSE</span>,
  show.legend <span class='op'>=</span> <span class='cn'>TRUE</span>,
  inherit.aes <span class='op'>=</span> <span class='cn'>TRUE</span>,
  origin <span class='op'>=</span> <span class='st'>"midpoint"</span>,
  horizonscale <span class='op'>=</span> <span class='fl'>6<