[R] ggplot question

[RON70]

In page http://had.co.nz/ggplot2/scale_date.html , there is a time series
plot for multiple variables at the bottom. i.e

qplot(date, value, data = em, geom = "line", group = variable) + 
+   facet_grid(variable ~ ., scale = "free_y") 

How can I make different color for different series?

Thanks
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