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\begin{document}
  
  
     
    \begin{tabular}{ lccc }
    Source  \rule{0pt}{3.6ex} \rule[-2.2ex]{0pt}{0pt}        & $\frac{ B\xspace\xspace^0\xspace\!\rightarrow\xspace  D\xspace\xspace^-\xspace \pi\xspace\xspace^+\xspace\xspace}{ B\xspace\xspace^0\xspace\!\rightarrow\xspace  D\xspace\xspace^-\xspace  K\xspace\xspace^+\xspace\xspace}$ (\%) & $\frac{ B\xspace\xspace^0_ s\xspace\xspace\xspace\!\rightarrow\xspace  D\xspace\xspace^-_ s\xspace\xspace\xspace \pi\xspace\xspace^+\xspace\xspace}{ B\xspace\xspace^0\xspace\!\rightarrow\xspace  D\xspace\xspace^-\xspace  K\xspace\xspace^+\xspace\xspace}$ (\%) &$\frac{ B\xspace\xspace^0_ s\xspace\xspace\xspace\!\rightarrow\xspace  D\xspace\xspace^-_ s\xspace\xspace\xspace \pi\xspace\xspace^+\xspace\xspace}{ B\xspace\xspace^0\xspace\!\rightarrow\xspace  D\xspace\xspace^-\xspace \pi\xspace\xspace^+\xspace\xspace}$ (\%)    \\
    \hline
    Detector acceptance    &                      &                        &                     \\
\hspace{0.5cm} and reconstruction & $0.7$         & $0.7$                  & $2.0-2.9$           \\
    Hardware trigger efficiency   & $2.0$         & $2.0$                  & $0.8$               \\
    Offline selection      & $1.2$                & $1.1$                  & $1.2$               \\
    BDT cut                & $1.0$                & $1.0$                  & $1.5$               \\
    PID selection          & $1.0$                & $1.5$                  & $1.1$               \\
    Comb. background       & $0.7$                & $1.0$                  & $0.8$               \\
    Signal shape (tails)   & $0.5$                & $0.6$                  & [correl.]           \\
    Signal shape (core)    & $0.8$                & $1.0$                  & [correl.]           \\
    Charmless background   & $0.4$                & --                     & [correl.]           \\
    \hline
    Total                  & $3.1$                & $3.4$                  & $3.2-3.8$           \\
    \end{tabular}
  
\end{document}
