%% 
%%  A DANTE-Edition example
%% 
%%  Example 02-22-3 on page 97.
%% 
%%  Copyright (C) 2010 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{153.70511pt}
\setlength\parindent{0pt}
\usepackage[english]{babel}
\usepackage[utf8]{inputenc}
\setlength\tabcolsep{3pt}

\usepackage{warpcol}

\begin{document}
\begin{tabular}{@{}
    >{\pcolbegin{l}{3.1}}c<{\pcolend}P{3.1}
    >{\pcolbegin{c}{3.1}}c<{\pcolend} @{}}\hline
 \multicolumn{1}{@{}c}{left-aligned}
   & \multicolumn{1}{c}{right-aligned}
   & \multicolumn{1}{c@{}}{centred}\\ \hline
 123.4&123.4&123.4\\12.3&12.3&12.3\\1.2&1.2&1.2\\\hline
 \end{tabular}
\end{document}