[R] trellis plot

Hi there,

I need some help about trellis plot. I have the following plot.

x <- c(rep(LETTERS[1:4],13), rep(LETTERS[4:1],12))

y <- rnorm(100)
z <- rep(1:2,50)
bwplot(y~factor(x)|z,layout=c(2,1), panel=function(x,y) panel.bwplot(x,y,horizontal=F))

Now I want to place "*" on the positions (1,-1.5) in the first panel and (2,-2.5) in the second panel. I need help on this.

Thanks.

Mahbub.

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