Superscript in R
How do I superscript the units this axis title. The "" represent the parts that I need to be superscripted: Photosynthetically available radiation (µE m"-2"d"-1") . I have used the formula and having no luck so far: plot(PAR~SST,data=brazilw, pch=15,col="red", main ="Fig. 1. Relationship between photosynthically available radiation\n and sea surface temperature", ylab=expression("Photosynthetically available radiation (µE m"^-2~d^-1)) Whilst I don't see a real problem in this particular instance , I can see if being an issue with other labels. I tend to group the elements of the super