[R] margin text warning message NAs coercion

[fishman.R]

I have a question for you. What's your purpose to put "additional text" in
the margin?  In your code, the first expression(A[1]~B[2]) corresponds to
text. If you wanna "additional text" together with expression(A[1]~B[2]),
you should use paste. If you can clarify what kind of margin you want, that
would be better to clear your confusions. By the way, you forgot a right ")"
after ylab= statement.   
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