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\begin{document}
 
  
  \begin{tabular}{l l}
    \hline
    Source & $\mathcal{R}$ [\%]\\
    \hline
PID                                                   & 4.0\\
Tracking                                              & 0.8\\
$\Xi\xspace^+_ c\xspace\xspace\xspace \rightarrow\xspace p K^{-}\pi^{+}$ Dalitz distribution        & 0.5\\
$\Xi\xspace^+_{ b\xspace\xspace c\xspace\xspace}\xspace$ mass                               & 0.4\\
Mass resolution                             
     & 1.5\\
$ B\xspace\xspace_ c\xspace\xspace^+\xspace$ signal shape                        & 0.2\\     
\hline
Total systematic uncertainty                                                & 4.4\\
\hline
\end{tabular}
\end{document}
