%% 
%%  A DANTE-Edition example
%% 
%%  Beispiel 02-26-1 auf Seite 103.
%% 
%%  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{355.65944pt}
\usepackage[utf8]{inputenc}

\usepackage{siunitx,booktabs}

\begin{document}
\begin{tabular}{S
                S[tabnumalign=centre,tabformat=2.4]
                S[tabnumalign=right, tabformat=2.4]
                S[tabnumalign=left,tabformat=2.4, decimalsymbol=comma]}\toprule
\emph{Standard}&\emph{Zentriert}&\emph{Rechtsbündig}&\emph{Linksbündig}\\\midrule
 2.3456 &  2.3456 &  2.3456 &  2.3456 \\
34.25   & 34.25   & 34.25   & 34.25   \\
 6.7835 &  6.7835 &  6.7835 &  6.7835 \\
90.473  & 90.473  & 90.473  & 90.473  \\\bottomrule
\end{tabular}
\end{document}