%% 
%%  A DANTE-Edition example
%% 
%%  Example 06-00-2 on page 179.
%% 
%%  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{375.57637pt}
\setlength\parindent{0pt}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\setlength\textwidth{300pt}

\usepackage{tabularx,booktabs,ragged2e}
\newcommand\raggedcolumn{\RaggedRight\hspace{0pt}}
\newcommand\centercolumn{\Centering\hspace{0pt}}

\begin{document}
\renewcommand*{\tabularxcolumn}[1]{b{#1}}%
\begin{tabularx}{\textwidth}{@{}*{3}{>{\raggedcolumn}X}*{3}
{>{\raggedcolumn}X}@{}}\toprule
header line 1 & header line 2 & header line 3 &
header line 4 & header line 5 & header line 6,
which is a bit longer as usual \\\midrule
foo & bar & baz & gg & gg & gg\\\midrule
foo & bar & baz & gg & gg & dd\\\bottomrule
\end{tabularx}
\end{document}