[R] Quiz: Who finds the nicest form of X_1^\prime?

[Marius Hofert]

Dear expeRts,

I would like to create a plotmath-label of the form X_1^\prime. Here is how to *not* do it [not nicely aligned symbols]:

plot(0,0,main=expression(italic(X*minute[1])))
plot(0,0,main=expression(italic(X[1]*minute)))
plot(0,0,main=expression(italic(X)[1]*minute))

Any suggestions?

Cheers,

Marius