%% 
%%  A DANTE-Edition example
%% 
%%  Beispiel 02-22-1 auf Seite 95.
%% 
%%  Copyright (C) 2010 H. 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.
%% 

%%Run also: >>  << 
% Show page(s) 1

\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{146.59192pt}
\setlength\parindent{0pt}

\usepackage{warpcol}

\begin{document}
\begin{tabular}{P{3.1} P{-2.1}}\hline
\multicolumn{1}{c}{\emph{Spalte 1}}
  & \multicolumn{1}{c}{\emph{Spalte 2}}\\\hline
 123.4 & -12.3\\12.3 & 12.3\\1.2 & 1.2\\\hline
 \end{tabular}
\end{document}