Personally, I don't think NSSuperscriptAttributeName is
particularly useful. I just adjust the baseline and font size:
newFontSize = oldFontSize * 0.75, baseline for superscript += 0.4
* oldFontSize, baseline for subscript -= 0.3 * oldFontSize.
I do something very similar, but instead of using the font size, the
baseline is calculated using the ascender/descender:
baseline for superscript = font ascender * 0.4
baseline for subscript = font descender * 0.35 // descender is negative
I have no idea whether this is any better than using the font size-
both methods seem a bit makeshift.
~Martin
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