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\begin{document}
\begin{tabular}{lc}
  \multicolumn{1}{l}{Source}  & Relative uncertainty \\
\hline
  Integrated luminosity              &     4.00\%  \\
  Unfolding parameter $\alpha$       &     0.25\%  \\
  --- Interactions not in acceptance & \hspace{10mm}  0.18\%  \\
  --- Efficiency                     & \hspace{10mm}  0.15\%  \\
  --- Misreconstructed tracks        & \hspace{10mm}  0.12\%  \\
  Luminous region and background     &     0.05\%  \\ 
\hline
  Total                              &     4.01\% 
\end{tabular}
\end{document}
