%% 
%%  A DANTE-Edition example
%% 
%%  Example 02-26-5 on page 106.
%% 
%%  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{201.70511pt}
\usepackage[utf8]{inputenc}

\usepackage{siunitx}
\usepackage{booktabs}

\begin{document}
\begin{tabular}{
  S[group-separator={},
  output-decimal-marker={\,\pm\,},
  input-digits={0123456789.},
  input-decimal-markers={+}]}\toprule
\emph{numbers}\\\midrule
 2.3456 + 0.02  \\
34.2345 + 0.001 \\
56.7835 + 0.067 \\
90.473  + 0.021 \\\bottomrule
\end{tabular}
\end{document}