I've been trying to figure out a parameter that will let you separately
adjust the parameters for the axis line from the tick mark.

In the following example, I would like to suppress the axis line, but keep
the tick marks.

Thanks,
Andrew


foo <- data.frame(x=1:3, y=4:6)
plot(foo$x, foo$y, type="n", axes=F)
points(foo$x, foo$y)
axis(side=1, at=foo$x, lty=0) #would like to figure out way to keep tick
marks, but suppress axis line

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