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\begin{document}
\begin{tabular}{lP{4}}
Source & \multicolumn{1}{c}{Value}\\
\midrule
Background model & 1.000 ! 0.039\\
Acceptance model & 1.000 ! 0.005\\
Mass model & 1.000 ! 0.004\\
 $ B\xspace\xspace^0$ \xspace lifetime & 1.000 ! 0.005\\
Fit method & 1.002 ! 0.002\\
Effective lifetime definition & 0.999 ! 0.001\\
\midrule
Total correction $f_{\text{corr}}^{\text{eff}}$ & 1.001 ! 0.040\\
\end{tabular}
\end{document}
