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I need an axis label in ggplot2 which reads "Assimilation (μmol CO2 m-2 s-1)" with the 2 of CO2 as subscript and the -2 and -1 as superscript. Thanks.

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    Read help("plotmath"). Commented Dec 12, 2014 at 14:13

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You could try

library(ggplot2)
qplot(uptake, data = CO2) +
   xlab(bquote('Assimilation ('*mu~ 'mol' ~CO[2]~ m^-2~s^-1*')'))

enter image description here

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