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\begin{document}
 

\begin{tabular}{lc}
  Source & Relative uncertainty (\%) \\ 
\midrule
Material interactions &  6.0 \\
Muon identification efficiency & 2.6 \\
Hadronic trigger efficiency & 4.9 \\
Muon trigger efficiency & 2.7 \\
$\mathcal{B}(\mbox{ D^0 \rightarrow\xspace \pi^{+} \pi^{-}}\xspace)$ [23] &  1.9  \\ 
\midrule
Total systematic uncertainty &  8.8 \\
\end{tabular}
\end{document}
