[R] Superscript in legend without using expression function

[jgui001]

I am plotting three sets of data on a single graph, and doing around 100+
graphs.
I can use the expression function to superscript the 2 but that seems to
force me to manually put in the R squared values. Is there away around this? 

This code will show what it should look like this but with the 2
superscripted

r1<-c(0.59,0.9,0.6)
plot(1:6)
legend("topleft",
legend=c(paste("G1 r=",r1[1]), paste("G2 r=",r1[2]), paste("G3 r=",r1[3])))



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