Dos this do what you want?

plot(1:10, xlab=expression(delta*{}^18*"O" * " VSMOW [‰]"))

The specific is to put an empty item there to hold the superscript.

On Wed, May 4, 2011 at 9:37 AM, Janhal <janine.halder@unil.ch> wrote:

> Salut,
> I have been struggling to superscript the 18 before the O without ^ visible
> and found only help to superscript numbers after the letter. Thanks to
> anyone who can help.
> xlab=expression(delta*18O VSMOW [‰]")
> Cheers,
> Janine
>
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