\documentclass[pstricks=true, preview]{standalone}
%\documentclass{article}

%%\usepackage{pstricks}
\usepackage{pst-all}
\usepackage{graphicx}

%\usepackage[helvet]{sfmath}
\renewcommand*{\familydefault}{\sfdefault}

\input{defs.tex}
\input{define_bools.tex}

\begin{document}
\begin{figure}
\begin{pspicture}(6.5,5.)

\rput[Rt](3.,4.85){\textbf{High to low type}}

\psframe[linestyle=none, 
         fillcolor=mygray, 
         fillstyle=solid](2.3,0.7)(4.,4.2)

\rput[Lt](3.1, 0.65){\footnotesize{Intermediate steps}}
\pspolygon[linestyle=none, 
         fillcolor=mygray, 
         fillstyle=solid](2.3,0.4)(4.,0.4)(6., 0.0)(0.3, 0.0)

\input{define_pops.tex}
\input{lw_HL_paths.tex}
\input{draw_paths.tex}
\input{draw_pops.tex}
\end{pspicture}
\end{figure}

\end{document}
%%% Local Variables:
%%% mode: latex
%%% TeX-master: t
%%% End: