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

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]:

Not all of us read LaTeX, so this is my initial guess at what you are  
requesting.  The "*" after the '1' is a non-space plotmath separator.

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

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))

If you wanted the tick after the 1, then think of 'minute' as a  
constant rather than as a function:

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

Or:

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

Any suggestions?

Greater effort at explanation that does not depend on intuiting your  
goal from erroneous code.

David Winsemius, MD
West Hartford, CT