linebreak in mathematical anotation?

Hi

I am using mathematical anotation to make the labels in a barplot in
italics. as an example (adapted from
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/129808.html):

tt <- c("italic(First~~set)", "italic(Second~~set)", "italic(third~~set")
barplot(1:3, names.arg=parse(text=tt))

But I would like to have it with "set" in a second column, like

tt <- c("First\nset", "Second\nset", "third\nset")
barplot(1:3, names.arg=tt)

only in italics. Is this possible?

Thanks

Rainer

Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
Faculty of Science
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University of Stellenbosch
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South Africa