Font size/rendering of superscripts in PDF output

Hello,

is it possible to reduce the font size of superscripts in PDF output 
(using XSL styleshettes)?

I often use terms like "n^2"; then the line of text in which the 
superscript "2" appears is set with a distance to the preceding line 1.5 
times bigger than lines without a superscript.

This does not look good in professional output. TeX does a much better 
job here. Is this a problem of current FO processors (because 
mathematical typesetting is hard)?

Greetings,
Joachim

-- 
Joachim Ziegler                       Stuhlsatzenhausweg 85
Max-Planck-Institut für Informatik    66123 Saarbrücken, Germany
Email:           Tel.: (+49) 0681 9325-127