\setlength{\unitlength}{0.012500in}%
%
\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{%
  \ifnum #1<17\tiny\else \ifnum #1<20\small\else
  \ifnum #1<24\normalsize\else \ifnum #1<29\large\else
  \ifnum #1<34\Large\else \ifnum #1<41\LARGE\else
     \huge\fi\fi\fi\fi\fi\fi
  \csname #3\endcsname}%
\else
\gdef\SetFigFont#1#2#3{\begingroup
  \count@#1\relax \ifnum 25<\count@\count@25\fi
  \def\x{\endgroup\@setsize\SetFigFont{#2pt}}%
  \expandafter\x
    \csname \romannumeral\the\count@ pt\expandafter\endcsname
    \csname @\romannumeral\the\count@ pt\endcsname
  \csname #3\endcsname}%
\fi
\fi\endgroup
\begin{picture}(135,210)(90,540)
\thinlines
\put(120,660){\framebox(30,30){}}
\thicklines
\put(135,690){\vector( 0, 1){ 29}}
\thinlines
\put(120,720){\framebox(30,30){}}
\thicklines
\put(174,631){\vector(-4, 3){ 37.600}}
\thinlines
\put( 90,600){\framebox(30,30){}}
\put( 90,540){\framebox(30,30){}}
\put(135,540){\framebox(30,30){}}
\put(180,540){\framebox(30,30){}}
\thicklines
\put(105,631){\vector( 1, 1){ 29}}
\put(104,570){\vector( 0, 1){ 29}}
\put(149,570){\vector( 3, 4){ 21}}
\put(195,570){\vector(-3, 4){ 21}}
\thinlines
\put(158,600){\framebox(30,30){}}
\put(165,706){\vector( 1, 0){ 60}}
\put(135,729){\makebox(0,0)[b]{\smash{\SetFigFont{12}{14.4}{rm}a.1}}}
\put(135,669){\makebox(0,0)[b]{\smash{\SetFigFont{12}{14.4}{rm}a.2}}}
\put(105,609){\makebox(0,0)[b]{\smash{\SetFigFont{12}{14.4}{rm}a.3}}}
\put(105,549){\makebox(0,0)[b]{\smash{\SetFigFont{12}{14.4}{rm}a.5}}}
\put(195,549){\makebox(0,0)[b]{\smash{\SetFigFont{12}{14.4}{rm}a.4.3}}}
\put(150,549){\makebox(0,0)[b]{\smash{\SetFigFont{12}{14.4}{rm}a.4.2}}}
\put(173,608){\makebox(0,0)[b]{\smash{\SetFigFont{12}{14.4}{rm}a.4}}}
\put(166,690){\makebox(0,0)[lb]{\smash{\SetFigFont{12}{14.4}{rm}Reference rel.}}}
\end{picture}
