%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  2. Auflage
%% 
%%  Beispiel 15-02-41 auf Seite 732.
%% 
%%  Copyright (C) 2016 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.
%% 
%% 
%% ==== 
verbatimtex
%% 
\documentclass[]{article}
\usepackage[T1]{fontenc}
\begin{document}
etex
% --- start of displayed preamble in the book ---
input graph;
% --- end of displayed preamble in the book ---
beginfig(1)
draw
  begingraph(8cm,5.5cm)
    path p,q;
    gdata("data/mp/data1-mp.dat", v,
      augment.p(v1,v2); );
    q:=(xpart point 0 of p, 0)--p--
      (xpart point length(p) of p,0)--cycle;
    gfill q withcolor 0.8white;
    gdraw p withpen pencircle scaled 2bp;
  endgraph;
endfig;
end;
\end{document}