[R] Italicize Greek symbols in axis

[Bingzhang Chen]

Hello there,

Is there any way to italicize Greek symbols such as mu in axis? From the help 
files of mathematical anotations: "Note that bold, italic and bolditalic do not 
apply to symbols, and hence not to the Greek symbols such as mu which are 
displayed in the symbol font.  They also do not apply to numeric constants.", it 
seems that it cannot be done.

Thanks,
Bingzhang Chen