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\begin{document}
\begin{tabular}{lcccc}
\hline\hline
Source &       $\Delta M_{X_b}$ & $\Delta M_{X_c}$ & $\tau(\Xi\xspace^0_ b\xspace\xspace\xspace)/\tau(\Lambda\xspace^0_ b\xspace\xspace\xspace)$ & PR \\
       &        ( $ {\mathrm{\,Me\kern -0.1em V\!/}c^2}$ \xspace)        &    ( $ {\mathrm{\,Me\kern -0.1em V\!/}c^2}$ \xspace)      &      (\%)              & (\%) \\
\hline
Signal \& back. model &   0.06      &       0.05    & 0.1   &  0.5  \\
$X_c K\xspace\xspace^-\xspace$ reflection    &   0.02      &       $-$     &  $-$  &  0.3 \\  
Momentum scale    &   0.06      &       0.06    &  $-$  &   - \\  
Sim. sample size  &  0.14       &       0.07    & 0.9 &  0.6 \\
Detection efficiency  &  $-$        &        $-$    & 0.4 &  1.0 \\  
BDT requirement   &  $-$        &        $-$    & 0.2 &  $-$ \\  
Trigger           &  $-$        &        $-$    & $-$   &  1.3 \\
$X_c$ mass range &  $-$        &        $-$    & $-$   &  0.3 \\   
\hline
Total          &   0.17         &        0.10   & 1.0 &  1.9 \\
\hline\hline
\end{tabular}
\end{document}
