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\begin{document}
\begin{tabular}{lcc}
\hline
Source                                  & $\Xi^-_ b\xspace\xspace\xspace \rightarrow\xspace  { J\xspace\mskip -3mu/\mskip -2mu\psi\xspace\mskip 2mu}\xspace \Xi^-\xspace$ & $\POmega^-_ b\xspace\xspace\xspace \rightarrow\xspace  { J\xspace\mskip -3mu/\mskip -2mu\psi\xspace\mskip 2mu}\xspace \POmega^-\xspace$ \\
\hline
Trigger efficiency                      & \,~9.9 & \,~6.5 \\
Reconstruction and selection efficiency &   29.0 &   45.0 \\
Signal modelling                        & \,~5.9 &   11.4 \\
Combinatorial background modelling      & \,~3.0 & \,~3.0 \\
Cross-feed background                   & \,~0.1 &   11.1 \\
Detector length scale                   & \,~0.3 & \,~0.3 \\
\hline
Total                                   &   31.4 &   48.3 \\
\hline
\end{tabular}
\end{document}
