siunitx: centering table headings (or other text contents)

I'm trying to center-align the two-line heading of the rightmost column of the following table. Given that I use decimal point alignment, I guess the centre of the headings should be aligned with the decimal point.

The code I used is below. I put table-text-alignment=center but it doesn't make any difference, as it can be seen.

\begin{table}[htp]
\centering
\begin{tabular}{
@{}
l
S[group-separator={,}, group-four-digits=true,table-format=5.0]
S[group-separator={,}, group-four-digits=true,table-format=5.0]
>{\bfseries}S[table-format=3.2, table-text-alignment=center]
@{}
}
\toprule
\textbf{Product Group} & \textbf{Production Size} & \textbf{Number of Failures} & \textbf{Failure Rates} \\
& & & \textbf{(per 1,000 items)} \\
\midrule
%  \addlinespace
this is foo1 & 11111 & 1111 & 11.11\\
this was foo2 & 22222 & 2222 & 222\\
this will be foo3 & 33333 & 3333 & 3.33\\
foo4 & 44444 & 4444 & 44.4\\
foo5 & 55555 & 5555 & 5.5\\
\bottomrule
\end{tabular}
\end{table}


I'm not sure what I'm doing wrong.

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1 Answer

You have to mask the critical heading cell with an additional set of curly braces.

... & {\textbf{Failure Rates}} \\

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