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\begin{document}
    
    
    \begin{tabular}{lrr}
    \toprule
    Source              & TOS $ _{\mu}$ \xspace                                                        & TOS $ _{\mu\mu}$ \xspace  \\ \midrule
    Tracking            & $0.4\%$                                                        & $0.4\%$   \\
    Selection           & $1.9\%$                                                        & $1.8\%$   \\
    Trigger             & $8.1\%$                                                          & $11.5\%$    \\
     $ K\xspace\xspace^0_{\mathrm{ \scriptscriptstyle S}}$ \xspace \mbox{$p_{\mathrm{ T}}$}\xspace spectrum    & $4.3\%$                                                        & $4.3\%$   \\
    Muon identification & $0.2\%$                                                        & $0.3\%$   \\ \midrule
    Signal mass shape   & $0.8\%$                                                        & $0.8\%$   \\\midrule
    Background shape    & \multicolumn{2}{c}{$0.9\%$}  \\
    \bottomrule
    \end{tabular}
    
\end{document}
