R help - Feb 2013 - how to change whisker width in bwplot (lattice)

Hello,

I am using lattice to draw boxplots.
I would like to make the whisker look shorter than the box width.
Please kindly advise how to modify the code.
Thank you.

Elaine

code

bwplot(x,y,
pch=rep("|",2),
box.umbrella = list(col = "black", lty = 1))

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