I'm trying to plot() over an existing plot() like this:
> attach(mtcars)
> plot(mpg, hp)
> par(new=TRUE)
> par("usr")
[1] 9.46 34.84 40.68 346.32
> plot(mpg, hp, col="red", axes=FALSE, xlim=par("usr")[1:2],
> ylim=par("usr")[3:4], xlab="", ylab="")
> par("usr")
[1] 8.4448 35.8552 28.4544 358.5456
For some reason "usr" is changing, and so it's not plotting over the
existing data in the right place.
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