Adds a Locfit line to an existing plot.  llines is for use
  within a panel function for Lattice.
# S3 method for locfit
lines(x, m=100, tr=x$trans, ...)
# S3 method for locfit
llines(x, m=100, tr=x$trans, ...)locfit object. Should be a model with one predictor.
Number of points to evaluate the line at.
Transformation function to use for plotting. Default is the inverse link function, or the identity function if derivatives are required.
Other arguments to the default lines function.
locfit, plot.locfit, lines