[R] xyplot - show values of a series on graph

[taz9]

Hi All,

I have a very simple graph:

cars <- c(1, 3, 6, 4, 9)
trucks <- c(2, 5, 4, 5, 12)
year <- c(2004, 2005, 2006, 2007, 2008)
df2<-data.frame(cars,trucks,year)
xyplot(cars+trucks~year, data=df2, type="o")

I need to show the values of "cars" on the graph. How can I do this?

Thanks.

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