say we have:

> x<-data.frame(a=c(1,2,3,4,5),b=c(1,1,1.5,2,2))
> y<-data.frame(a=c(1,2,3,4,5),b=c(1,2,2,3,3))

How would I plot this so that, with the shared $a as the x-axis values, I
have both $b columns plotted together?  (a comparison of the two?)

thanks.


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