%%
%% The LaTeX Companion, 3ed
%%
%% Example 6-7-15 on page I-485 in "siunitx --- Scientific numbers in tables".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See
https://www.latex-project.org/lppl.txt for details.
%%
\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{183.0pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{siunitx}
%StopShownPreambleCommands
\begin{document}
\begin{tabular}{|S|S[table-format=1.4]|
S[table-format=1.4,table-number-alignment=left]|
S[table-format=1.2,table-number-alignment=right]|}
{default}&{Heading} &{Heading}&{Heading} \\
2.3456 & 2.3456 & 2.3456 & 2.3456 \\
4.2 & 4.2 & 4.2 & 4.23 \\
6.783 & 6.783 & 6.783 & 6.783 \\
-1.47 & -1.47 & -1.47 & -1.47
\end{tabular}
\end{document}
