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%%
%% A DANTE-Edition example
%%
%% Example 16-03-3 on page 237.
%%
%% Copyright (C) 2011 Herbert Voss
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3
%% of this license or (at your option) any later version.
%%
%% See http://www.latex-project.org/lppl.txt for details.
%%
%%
%% ====
% Show page(s) 1
%%
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\setlength\parindent{0pt}
\usepackage{pstricks,pst-node}
\def\DefNodes#1#2{\rnode[tl]{#1-tl}{\rnode[tr]{#1-tr}{%
\rnode[bl]{#1-bl}{\rnode[br]{#1-br}{#2}}}}}
\begin{document}
\LARGE\[ \frac{\DefNodes{A}{A_1}+\DefNodes{B}{B_1}+C_1}
{\DefNodes{D}{D_1}+\DefNodes{E}{E_1}+\DefNodes{F}{F_1}} \]
\psccurve[linecolor=red,linestyle=dashed,fillstyle=hlines,hatchcolor=yellow]%
(D-bl)(A-tl)(A-tr)([angle=-90,nodesep=0.1]B-bl)
([angle=-90,nodesep=0.1]B-br)(F-tr)(F-br)(F-bl)
([angle=90,nodesep=0.1]E-tr)([angle=90,nodesep=0.1]E-tl)(D-br)(D-bl)
\end{document}
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