y-axis with "break"

Dear R-users

I would like to draw a barplot with a special y-axis. Most of my data points are
in the range from -50 to 50, apart from one value that is 550. I would now like
to have a y-axis from -50 to 50, then a "break" and the "rest" of the y-axis,
let's say from 500 to 600. In order to make clear what I'm trying to do, I
attached a figure.

Is it possible to do this in R?

Not really, I think. What you can do, e.g., is that ugly trick along the
following lines:

 barplot(c(-50, 50, 450 - 300, 50), ylim=c(-150, 200), yaxt="n")
 axis(2, seq(-150, 200, 50), labels = c(seq(-150, 100, 50), 450, 500))
 lines(rep(par("usr")[1], 2), c(100, 150), col="white", lty="dashed")

Better solutions are welcome!

Uwe Ligges
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