[R] Lattice xyplot with two y axis

[taz9]

Hi All,

I have some data which needs to be plotted with lattice.

library(lattice)
cars <- c(0.1, 0.3, 0.6, 0.4, 0.9)
trucks <- c(0.2, 0.5, 0.4, 0.5, 0.1)
drivers<-c(121,145,167,200, 210)
year<-c(2005,2006,2007,2008,2009)
type<-c("local","local","foreign","foreign","foreign")
xyplot(cars+trucks~year|type, data=df3, type="o")

Basically, I need to show "drivers" as well on a secondary y-axis. Is this
possible with lattice and xyplot?

Any ideas and help would be much appreciated. Thanks.
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