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\begin{document}
 
\begin{tabular}{lcc}
Source & $\sigma_{p_0}$ & $\sigma_{p_1}$ \\
\hline
Decay time resolution                 & 0.0033 & 0.060 \\
Calibration method                    & 0.0002 & 0.006 \\
Signal mass model                     & 0.0001 & 0.002 \\ 
Background mass model                 & 0.0015 & 0.025 \\
$ B\xspace\xspace^0_ s\xspace\xspace\xspace \rightarrow  D\xspace\xspace^-_ s\xspace\xspace\xspace  K\xspace\xspace^+\xspace$ yield      & 0.0001 & 0.008 \\ \hline
Sum in quadrature                     &  0.0036      & 0.066       
\end{tabular}
\end{document}
