Align elements in tabular like align environment

Question

in this table:

\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{bigstrut}

\begin{document}
   \begin{tabular}{rcc}
    \hline
    Text 1  & $6,58\pm0,45$     & $6,94\pm0,51$\bigstrut[t]\\
    Text 2  & $25\pm1$          & $29\pm3$\\
    Text 3  & $8,16\pm 2,23$    & $11,01\pm1,93$\\
    Text 4  & $60\pm 14$        & $148\pm8$\\
    Text 5  & $90,7\pm 2,5$     & $109,2\pm3,8$\\
    Text 6  & $0,030\pm 0,008$  & $0,034\pm0,004$\\
    Text 7  & $5,72\pm 0,66$    & $143,47\pm38,47 $\\
    Text 8  & --                & $(10,81\pm1,19)\times10^{5}$\\
    Text 9  & --                & $‑12,95\pm 0,35$\bigstrut[b]\\
    \hline
    \end{tabular}
\end{document}

How can I align the elements in columns 2 and 3 by the \pm symbol. I'd like to have all the \pm symbols aligned in the center

Answer 1

In my view, aligning the numbers before and after the \pm symbols on their respective decimal markers is at least as important as aligning the \pm symbols. To achieve the former objective, I suggest you use the dcolumn package. (That way, you will also avoid the excessive spacing after the commas that serve as the decimal markers.) To achieve the latter, simply place the \pm directives in separate columns.

Incidentally, the "minus" symbol in the final row of your tabular environment isn't an ASCII symbol; I've replaced it with - (simple dash) to that TeX can generate a mathematical minus symbol.

\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath,amsfonts,amssymb}
\usepackage{array,dcolumn,booktabs}
\newcolumntype{d}[1]{D{,}{,}{#1}} % numbers aligned on decimal commas
\newcolumntype{C}{>{${}}c<{{}$}}  % for columns that house "\pm" symbols
\begin{document}
\begin{tabular}{@{} l d{2.3}@{}C@{}d{2.3} d{3.3}@{}C@{}d{2.6}}
    \toprule
    Text 1  & 6,58&\pm&0,45     & 6,94&\pm&0,51\\
    Text 2  & 25&\pm&1          & 29&\pm&3\\
    Text 3  & 8,16&\pm& 2,23    & 11,01&\pm&1,93\\
    Text 4  & 60&\pm& 14        & 148&\pm&8\\
    Text 5  & 90,7&\pm& 2,5     & 109,2&\pm&3,8\\
    Text 6  & 0,030&\pm& 0,008  & 0,034&\pm&0,004\\
    Text 7  & 5,72&\pm& 0,66    & 143,47&\pm&38,47 \\
    Text 8  & \multicolumn{3}{c}{--}  & (10,81&\pm&1,19)\times10^{5}\\
    Text 9  & \multicolumn{3}{c}{--}  & -12,95&\pm& 0,35\\
    \bottomrule
\end{tabular}
\end{document}

Answer 2

A solution using siunitx

\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{bigstrut}

\usepackage[separate-uncertainty=true,output-decimal-marker={,}]{siunitx}
\usepackage{booktabs}

\begin{document}
\begin{table}
   \begin{tabular}{rS[table-format=2.3(3)]S[%   
        table-format=-3.3(4)e1, 
        table-align-exponent = false, 
        table-space-text-post={)$\times 10^5$},
        table-space-text-pre={(},
        table-align-text-post=false,
        table-align-text-pre=false,
   ]}
    \toprule
    Text 1  & 6.58 +- 0.45    & 6.94 +- 0.51\\
    Text 2  & 25 +- 1         & 29 +- 3\\
    Text 3  & 8.16 +- 2.23    & 11.01 +- 1.93\\
    Text 4  & 60 +- 14        & 148 +- 8\\
    Text 5  & 90.7 +- 2.5     & 109.2 +- 3.8\\
    Text 6  & 0.030 +- 0.008  & 0.034 +- 0.004\\
    Text 7  & 5.72 +- 0.66    & 143.47 +- 38.47 \\
    Text 8  & {--}            & {(}10.81(119){)$\times 10^5$}\\% (10.81e5 +- 1.19e5)
    Text 9  & {--}            & -12.95 +- 0.35\\
    \bottomrule
    \end{tabular}
\end{table}

\end{document}