Hi All,

I'm trying to write "ug/m3" as y-label, with greek letter "mu" replacing "u"
AND "3" going as a power.

These commands works in general:

plot.new()
text(0.5, 0.5, expression(symbol("m")))

But, I'm sure about how to do it using barchart() from "Lattice". Can anyone
help please?

Thanks,
Peng Cai

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