Vertical distance between text and equations

Dear Prosper-Users,

I have defined my own prosper style file which contains the lines

\FontText{%
\usefont{T1}{cmr}{m}{n}\fontsize{10pt}{10pt}\selectfont}{%
\usefont{T1}{cmr}{m}{n}\fontsize{10pt}{10pt}\selectfont}

I have tried adding an "\abovedisplayskip 3pt minus1pt plus1pt" before the
selectfont commands, however, this has no effect on the vertical distance
between my equations and the preceeding text. How can I change this distance
without having to manually add abovedisplayskip before each \begin{align*}
command?

Thanks for any help
Rudi




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