locfit or preplot.locfit
object.plot.locfit.1d(x, add=FALSE, main="", xlab="default", ylab=x$yname,
type="l", ylim, lty=1, col=1, ...)preplot.locfit object.TRUE, the plot will be added to the existing
plot.plot (only if add=FALSE).plot function
(only if add=FALSE).locfit, plot.locfit, preplot.locfit