Here's a naive question about axis()

How do you control the location of the labels with the axis() command?

In the following example:

foo <- data.frame(plot.x=seq(1:3), plot.y=seq(4:6))
plot(foo$plot.x, foo$plot.y, type='n', axes=FALSE)
points(foo$plot.x, foo$plot.y)
axis(1, at=foo$plot.x, labels=foo$plot.x)

I'd like to be able the control the y location of the labels (i.e. move up
or down in the graph).

Thanks,
Andrew

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