unused, here for compatibility with the base
plot function
...
additional graphical parameters to be passed
on to the plot
Details
The default plot is a spaghetti plot of all the data,
with a line joining the observations for each subject. If
censored data is present, it is shown with a different
symbol and colour.
References
K. Brendel, E. Comets, C. Laffont, C. Laveille, and
F.Mentre. Metrics for external model evaluation with an
application to the population pharmacokinetics of
gliclazide. Pharmaceutical Research, 23:2036--49,
2006.