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\begin{document}
\begin{tabular}{lc}
\hline \hline
Source                                              & $\sigma(\mathcal{B}\xspace( B\xspace\xspace^0\xspace\!\rightarrow\xspace  D\xspace\xspace^+_ s\xspace\xspace\xspace\pi\xspace\xspace^-\xspace\xspace)$) [\%] \\
\hline
Fit model\\
\hspace{0.25cm} Signal shape parametrisation        & $5.1$ \\
\hspace{0.25cm}  $ B\xspace\xspace^0\xspace\!\rightarrow\xspace  D\xspace\xspace^+_ s\xspace\xspace\xspace\pi\xspace\xspace^-\xspace$ \xspace signal width                & $1.5$ \\
\hspace{0.25cm}  $ B\xspace\xspace^0\xspace\!\rightarrow\xspace  D\xspace\xspace^+_ s\xspace\xspace\xspace\pi\xspace\xspace^-\xspace$ \xspace mean                        & $0.2$ \\
\hspace{0.25cm} Partially reconstructed backgrounds & $4.2$ \\
\hspace{0.25cm} Misidentified backgrounds                   & $0.6$ \\
Efficiencies\\
\hspace{0.25cm} Hardware trigger efficiency         & $0.3$ \\
\hspace{0.25cm} Reconstruction efficiency           & $0.5$ \\
\hspace{0.25cm} BDT efficiency                      & $0.7$ \\
\hspace{0.25cm} PID efficiency                      & $1.1$ \\
\hline
Total                                               & $6.9$ \\
\hline \hline
\end{tabular}
\end{document}
