set the line width, same as in plot. Specified in
order of the main line and the two confidence bands.
…
any other passthru parameters
fill
a three-component vector or list (recycled otherwise) providing
filling values at the left/within/to the right of the data range. See the
fill argument of na.fill for details.
Details
The previous parameter na.pad has been replaced with fill; use fill = NA instead of
na.pad = TRUE, or fill = NULL instead of na.pad = FALSE.