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\begin{document}
\begin{tabular}{rccc}
\hline
Sources &  $ p\xspace\xspace\mathrm{Pb}$ \xspace &  $\mathrm{Pb} p\xspace\xspace$ \xspace \\
\hline
$N_\mathrm{cand.}$ & $6.1\%$ & \phantom{0}$7.7\%$ \\
Purity $\rho$ & $0.4\%$ & \phantom{0}$0.4\%$ \\
Luminosity  $\mathcal{L}$ \xspace & $2.6\%$ & \phantom{0}$2.5\%$ \\
Reconstruction and selection efficiency & $4.3\%$ & $10.2\%$ \\
Muon identification efficiency & $0.2\%$ & \phantom{0}$0.2\%$ \\
Trigger efficiency & $0.3\%$ & \phantom{0}$0.7\%$ \\
\hline 
Total & $7.7\%$ & $13.0\%$ \\
\hline
\end{tabular}
\end{document}
