ts.plot {stats}  R Documentation 
Plot several time series on a common plot. Unlike
plot.ts
the series can have a different time bases,
but they should have the same frequency.
ts.plot(..., gpars = list())
... 
one or more univariate or multivariate time series. 
gpars 
list of named graphics parameters to be passed to the
plotting functions. Those commonly used can be supplied directly in

None.
Although this can be used for a single time series, plot
is
easier to use and is preferred.
require(graphics)
ts.plot(ldeaths, mdeaths, fdeaths,
gpars=list(xlab="year", ylab="deaths", lty=c(1:3)))