[R] How to write a Greek letter in a graph?

[cathelf]

Hi,
Sorry for bothering you again. I have a small question about the graph and
the following is my code:

xyplot(power1+power2 ~ pi0, data=resultb, ylab="Average 
Power", type="l", pch=LETTERS[1:2], lty=c(1:2), main="(a)")

The name of the X-axis will be “pi0” in the graph. 


What should I do if I want the name of the X-axis is the 
Greek letter of “pi0”?


Thanks a lot!
Catherine

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