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\begin{document}
\begin{tabular}{lcc}
\hline\hline
Source           & \multicolumn{2}{c}{Value (\%)} \\
                 & $\Lambda\xspace^+_ c\xspace\xspace\xspace\pi\xspace\xspace^-\xspace$ & $\Lambda\xspace^+_ c\xspace\xspace\xspace\pi\xspace\xspace^-\xspace\pi\xspace\xspace^+\xspace\pi\xspace\xspace^-\xspace$ \\
\hline
$\Xi\xspace^-_ b\xspace\xspace\xspace$ signal shape     &       1.4      &  2.4   \\
$\Xi\xspace^-_ b\xspace\xspace\xspace$ background shape  &      3.1      &  1.8 \\
$\Lambda\xspace^0_ b\xspace\xspace\xspace$ signal shape       &       0.3      &  0.8    \\
$\Lambda\xspace^0_ b\xspace\xspace\xspace$ background shape   &       0.1     & 0.7      \\
Geom. acceptance          &      1.8      &  1.8    \\
Sim. weights \& sample sizes  &  3.6      &  3.4     \\
Trigger efficiency       &       1.7      &  0.4    \\
\hline
$\Xi\xspace^-_ b\xspace\xspace\xspace$ $ p_{\mathrm{T}}\xspace$ spectrum   &       3.2      &  5.6     \\
IP resolution            &       1.3      &  0.7      \\
BDT2 efficiency          &       3.0      &  3.5     \\
Tracking efficiency        &       3.3      &  3.3    \\
Multiple candidates      &       0.5      &  2.6    \\
$\Xi\xspace^-_ b\xspace\xspace\xspace$ lifetime         &       3.0      &  2.5    \\       
\hline
Total                    &       8.5      &  9.7     \\
\hline\hline
\end{tabular}
\end{document}
