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\begin{document}
\begin{tabular}{lc}
Source & Uncertainty (\%)\\\hline
Mass model & 3.0 \\
Simulation sample size & 2.2 \\
Tracking efficiency & 0.5\\
Vertex efficiency & 2.6\\
Hardware trigger & 2.8\\
Selection efficiency & 4.1\\
Peaking background & 0.1 \\\hline
Total & 6.7
\end{tabular}
\end{document}
