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\begin{document}
  
   
  
  \begin{tabular*}{0.9\textwidth}{@{\hspace{10mm}}l@{\extracolsep{\fill}}c@{\hspace{10mm}}}
    \hline       
    Source &  Systematic uncertainty $\left[\%\right]$\\
    \hline    
    Track finding efficiency  
    & $4\times4$      \\
    Trigger efficiency
    & 8              \\ 
    Per-event efficiency
    & 3              \\ 
     $ { J\xspace\mskip -3mu/\mskip -2mu\psi\xspace\mskip 2mu}$ \xspace~polarization 
    & $2\times5$      \\ 
    Data/simulation difference for $\chi^2_{\mathrm{}}/{\mathrm{ndf}}$ %
    & 3               \\
    Global event cuts 
    & 2               \\
    Muon identification  
    & $2\times1.1$              \\
    Luminosity 
    & 3.5             \\
    $ { J\xspace\mskip -3mu/\mskip -2mu\psi\xspace\mskip 2mu}\xspace\rightarrow\xspace\mu\xspace^+\mu\xspace^-\xspace$ branching ratio 
    & $2\times1$    \\
    \hline
    Total 
    & 21              \\
    \hline    
  \end{tabular*}
\end{document}
