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% Votre préambule
\documentclass{article} %% nécessaire
\usepackage[frenchb]{babel} %% pour ton \DecimalMathComma
\usepackage{pst-all} %% pour être tranquille
\usepackage{ifthen} %% nécessaire à la macro bam
\usepackage{calc}
% la macro d'éric
%\bam{min}{d1}{q1}{med}{q2}{d9}{max}{xiso1,xiso2,...}
\newlength{\haut}
\newlength{\bas}
\newcounter{bam}\setcounter{bam}{-1}
\makeatletter
\newcommand{\bam}[8]{
\ifthenelse{\thebam=-1}{
\psset{fillstyle=solid}
%%% ajuster l'unité de l'axe
%%% fixée à 32 fois xunits ici  
\psline(0,0)(32,0) %% 32 marques
{\scriptsize
  \multido{\n=0+1}{32}{%32 marques 
    \psline(\n,.1)(\n,-.1)
    \uput[d](\n,0){\n}}}
}{}
%%
\addtocounter{bam}{3}
%%%% ajuster l'épaisseur des boites, fixées à 1 cm ici :
\setlength{\haut}{\thebam\psyunit+.5cm}
\setlength{\bas}{\thebam\psyunit-.5cm}
%%%%%
\@for\liste:=#8,#1,#7\do{\place\liste}
\psline{|-|}(#2,\thebam\psyunit)(#6,\thebam\psyunit)
\psframe(#3,\bas)(#5,\haut)
\psline(#4,\bas)(#4,\haut)
}
\def\place#1{\psdots(#1,\thebam\psyunit)}
\makeatother
%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\begin{document}
\DecimalMathComma
%%% Réglage de taillle
\psset{xunit=0.4cm,yunit=0.8cm}

\begin{pspicture}(0,0)(32,9)
 \bam{4}{8}{12}{16}{20}{24}{30}{6,26,28}
  \bam{13}{14}{15}{17}{18}{19}{20}{}
   \bam{16}{16.2}{16.4}{16.6}{16.9}{17}{17.3}{16.1,17.1,17.2}
\end{pspicture}

\end{document}