\begin{picture}(0,0)%
\special{psfile=omega.ps}%
\end{picture}%
\setlength{\unitlength}{0.005000in}%
%
\begingroup\makeatletter\ifx\SetFigFont\undefined
% extract first six characters in \fmtname
\def\x#1#2#3#4#5#6#7\relax{\def\x{#1#2#3#4#5#6}}%
\expandafter\x\fmtname xxxxxx\relax \def\y{splain}%
\ifx\x\y   % LaTeX or SliTeX?
\gdef\SetFigFont#1#2#3{%
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  \ifnum #1<24\normalsize\else \ifnum #1<29\large\else
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\gdef\SetFigFont#1#2#3{\begingroup
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  \def\x{\endgroup\@setsize\SetFigFont{#2pt}}%
  \expandafter\x
    \csname \romannumeral\the\count@ pt\expandafter\endcsname
    \csname @\romannumeral\the\count@ pt\endcsname
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\fi\endgroup
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\put(486,697){\makebox(0,0)[lb]{\smash{\SetFigFont{5}{6.0}{rm}$S_t$}}}
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\put(370,302){\makebox(0,0)[lb]{\smash{\SetFigFont{5}{6.0}{rm}$\Pi'$}}}
\put(406,302){\makebox(0,0)[lb]{\smash{\SetFigFont{5}{6.0}{rm}$\Pi$}}}
\put(446,302){\makebox(0,0)[lb]{\smash{\SetFigFont{5}{6.0}{rm}$\Pi''$}}}
\end{picture}
