[R] refering to the 'boundaries' of a graph

[Dean1]

Please see this code for a demonstration of my problem...

xlim <- c(-1,5)
plot(1:4, xlim=xlim)
abline(v=xlim[1])
abline(v=xlim[2])

When I refer to xlim, it is not referring to the boundaries of the graphical
region, it refers to the maximum and minimum xticks.  My question is how can
I refer to the x axis boundaries (and similarly y axis) of the graph?
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