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%%  Ein Beispiel der DANTE-Edition
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%%  2. Auflage
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%%  Beispiel 06-03-104 auf Seite 278.
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%%  Copyright (C) 2016 Herbert Voss
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%%  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.
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% Show page(s) 1
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{352.81416pt}
\usepackage[utf8]{inputenc}
%StartShownPreambleCommands
\usepackage{siunitx,booktabs}
%StopShownPreambleCommands
\begin{document}
\begin{tabular}{S
                S[table-number-alignment=center,table-format=2.4]
                S[table-number-alignment=right, table-format=2.4]
                S[table-number-alignment=left,table-format=2.4,
                  output-decimal-marker={,}]}\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}