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Capital subscript are too large

Here is a little problem from my work:

We have an axial coupling constant, conventionally called $g_A$. However, 
in this combination the `A' does not really look subscript. After some 
experimenting, I came up with the following: $g_{\text{\sc A}}$ which looks 
fine. That the `A' is now upright is not that bad in this case, in fact it 
is not a mathematical symbol but has textual semantics.

I think this little problem should have a more general solution. I imagine 
a style which prescribes different sizes for subscripts, depending if a 
lowercase letter is subscripted or a capital one. Since I have not tried 
it, I don't know how difficult to achieve this might be.

Just to provoke ideas...

--J"org Knappen.