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\begin{document}
    
    
        \begin{tabular}{l|c|c}
            \hline
            \multirow{2}{*}{Process}  &  \multicolumn{2}{c}{$\varepsilon_{\rm bkg}/\varepsilon_{B_s^0}\; [\times10^{-3}] $}  \\ \cline{2-3}
                     & Run 1 & Run 2 \\ \hline
            $B^0 \rightarrow\xspace K^{*0} \mu^+\mu^-$  & $0.671 \pm 0.041$ & $0.344 \pm 0.018$ \\ 
            $\Lambda\xspace^0_ b\xspace\xspace\xspace \rightarrow\xspace p K^- \mu^+ \mu^-$  & $0.717 \pm 0.033$ & $0.469 \pm 0.016$ \\ 
            $B_s^0 \rightarrow\xspace D_s^- \mu^+ \nu$ & $0.298 \pm 0.015$ & $0.299 \pm 0.008$ \\ \hline
        \end{tabular}
            
    
\end{document}
