Hi All,

I'm trying to get following but not successfully:

# this works okay
ylab=expression("PM2.5 Concentration ("*mu*g/m^3*")")

# But I need "2.5" as a subscript to PM and below this an additional line
saying some text, like.
ylab=expression("PM[2.5] Concentration ("*mu*g/m^3*")"\n(random text in
brackets))

Square brackets doesn't seem to work because I'm using them in "" and \n
operator is not working too. Any help would be highly appreciated, thanks,
Peng Cai

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