%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 6-1-27 on page 322.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  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.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{135.83385pt}
\StartShownPreambleCommands
\usepackage{pstricks,pst-plot}
\newcommand\Month[1]{%
  \ifcase#1\or January\or February\or March\or April\or May\or June\or%
    July\or August\or September\or October\or November\or December\fi}%
\newcommand\Level[1]{%
  \ifcase#1\or Low\or Medium\or High\fi}%
\renewcommand\psvlabel[1]{\footnotesize\Level{#1}}
\renewcommand\pshlabel[1]{\rput[rb]{30}{\footnotesize\Month{#1}}}
\StopShownPreambleCommands
\begin{document}
\psset{unit=0.8}
\begin{pspicture}(-0.5,-1)(13,4)
  \psaxes[showorigin=false]{->}(13,4)
\end{pspicture}
\end{document}