xlab=expression(bar(temp))
or
xlab=expression(bar(" temp"))
The overbar looks like it begins above "e" in the first case.
See demo(plotmath).
Jason Horn wrote:
>
> Can anyone tell me how to produce a macron (or overbar or overline)
> symbol on an R plot. I have an axis that is labeled "temp", but I
> need the overbar symbol over the entire word.
>
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