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\begin{document}
\begin{tabular}{lp{6.0cm}lp{6.0cm}l}
  Source & Uncertainty ($\%$) \\
\hline
Luminosity  & 3.5   \\
Trigger efficiency & 4   \\
Tracking efficiency & 2  \\
Identification efficiency   & 5 \\
Selection efficiency    & 1   \\      
Single interaction efficiency & 0.7   \\           
 $\psi\xspace{(2S)}\xspace$ background ($ { J\xspace\mskip -3mu/\mskip -2mu\psi\xspace\mskip 2mu}\xspace$ analysis)   & 0.3 \\     
  $\chi\xspace_{c}\xspace$ background ($ { J\xspace\mskip -3mu/\mskip -2mu\psi\xspace\mskip 2mu}\xspace$ analysis)   & 0.8  \\                  
Signal shape of dimuon $\mbox{$p_{\rm T}$}\xspace$ fit & 6 \\   
Background shape of dimuon $\mbox{$p_{\rm T}$}\xspace$fit & 6 \\                                                           
\end{tabular}
\end{document}
