[R] How to insert angular brackets in plot text?

[manojit]

I am somewhat of a newbie, and trying to insert angular brackets in my axis
label, something like expression(group("(",italic(N),")")) that seems to
work fine, but returns "invalid delimiter" error when I replace the "(",")"
pair with "<",">". The alternative expression(paste("<",italic(N),">")) does
not look *mathy*. Any help?

Thanks,
manojit
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