Typesetting boldface math in table using siunitx and unicode-math

Question

I've been trying to get some entries in my table typeset in boldface while using siunitx for the proper alignment.

I've tried numerous other answers I found on the web, but the issue I have is that I want the numbers to be rendered in the math font, not the main font.

This is the current minimal example code for my problem:

%!TEX TS-program = xelatex
%!TEX encoding = UTF-8 Unicode

\documentclass[12pt,a4paper,oneside]{memoir}

\usepackage{mathtools}
\usepackage{babel}  % Language hyphenation and typographical rules
\usepackage{csquotes}  % Context sensitive quotation facilities
\usepackage{microtype}  % Slightly tweak font spacing for aesthetics
\usepackage[warnings-off={mathtools-colon}]{unicode-math}
\usepackage{siunitx}
\usepackage{booktabs, longtable}  % Better looking tables
\usepackage{etoolbox}

\setmainfont{EBGaramond-Regular}
\setmathfont{STIX Two Math}

\begin{document}

\begin{table}[t]
    \centering
    \robustify\bfseries
    \sisetup{detect-weight, separate-uncertainty, group-minimum-digits = 4}
    \begin{tabular}
        {l S[table-format=3.2(1)] S[table-format=2.0] S[table-format=3.2(1)] S[table-format=3.0]}
        \toprule
                       & \multicolumn{2}{c}{{Point-mass}}          & \multicolumn{2}{c}{{Pendulum}} \\
                       \cmidrule(lr){2-3}                        \cmidrule(lr){4-5}
                       & {Cost $(\mu \pm \sigma)$} & {Succ.$^\dag$} & {Cost $(\mu \pm \sigma)$} & {Succ.$^\ddag$} \\
        \midrule
        {mppi}$^\S$ & {---}                   & {---}                        & 30.8 +- 12.6            & 100\unit{\percent} \\
        {disco}     & 250.8 +- 29.9           & 20\unit{\percent}            & 61.3 +- 40.0            &  70\unit{\percent} \\
        {svmpc}     & 191.7 +- 56.5           & 25\unit{\percent}            & 44.5 +- 17.9            &  70\unit{\percent} \\
        {dust}      & \bfseries 118.3 +- 7.9  & \bfseries 100\unit{\percent} & $\symbf{36.8 \pm 14.0}$ &  80\unit{\percent} \\
        \bottomrule
    \end{tabular}
\end{table}

\end{document}

Using \symbf gets the bf math font, but breaks the alignment. Could anyone please help? Thanks in advance!

Answer 1

Let me extend my comment to answer:

• Something like this?

• In real document you can remove red color, here is just for emphasis bold numbers in table.
• Table use talltlbr of tabularray package. It enables zo write table notes below table.
• In table is used siunitx syntax separate-uncertainty
• Columns are in mode=text

\documentclass[12pt,a4paper,oneside]{memoir}

\usepackage{babel}  % Language hyphenation and typographical rules
\usepackage{csquotes}  % Context sensitive quotation facilities
\usepackage{microtype}  % Slightly tweak font spacing for aesthetics
\usepackage[warnings-off={mathtools-colon}]{unicode-math}
\setmainfont{EBGaramond-Regular}
\setmathfont{STIX Two Math}

\usepackage{xcolor}
\usepackage{tabularray}
\UseTblrLibrary{booktabs, siunitx, varwidth}
    \SetTblrStyle{note}{font=\footnotesize}

\usepackage{etoolbox}
\newrobustcmd\B{\DeclareFontSeriesDefault[rm]{bf}{b}%
                \bfseries\color{red}}

\begin{document}
    \begin{table}
\sisetup{table-alignment-mode = format,
         table-number-alignment = center,
         detect-weight, % <--
         mode=text,     % <--
         separate-uncertainty
        }
    \centering
\begin{talltblr}[
caption = {Reserving space in \texttt{S} columns.},
  label = {tab:S:format},
note{\S}    = {some texplanationon},
note{\dag}  = {some texplanationon},
note{\ddag} = {some texplanationon}
                ]{colspec = {l 
                            Q[c, si={table-format=3.1(3)}]
                            Q[c, si={table-format=2.0}]
                            Q[c, si={table-format=2.1(3)}]
                            Q[c, si={table-format=3.0{\,\%}}]
                            },
                 cell{3-Z}{5} = {appto= {\,\%} },
                 row{1,2} = {guard}
                 }
    \toprule
        &   \SetCell[c=2]{c}    Point - mass
            &  &   \SetCell[c=2]{c}    Pendulum
                     &                  \\
        \cmidrule[lr]{2-3}
        \cmidrule[l]{4-5}
        &   Cost $(\mu \pm \sigma)$
            &   Succ.\TblrNote{\dag}
                &   Cost $(\mu \pm \sigma)$
                    &   Succ.\TblrNote{\ddag}   \\
    \midrule
mppi\TblrNote{\S}
        & {{{--}}}  
            & {{{--}}}  
                & 30.8(12.6)  
                    & 100           \\
disco   & 250.8(29.9)
            & 20
                & 61.3(40.0)
                    &  70           \\
svmpc   & 191.7(56.5)
            & 25
                & 44.5(17.9)
                    &  70           \\
dust    &\B 118.3(1)%(7.9)
            &\B 100
                &\B 36.8
                    &    80         \\
    \bottomrule
\end{talltblr}
    \end{table}
\end{document}