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\begin{document}
\begin{tabular}{ccccc}
Source & \multicolumn{4}{c}{Uncertainty [\%]} \\ \hline
&  $ R_{ W\xspace^\pm\xspace}$ \xspace &  $ R_{ W\xspace^+\xspace Z\xspace\xspace}$ \xspace &  $ R_{ W\xspace^-\xspace Z\xspace\xspace}$ \xspace &  $ R_{ W\xspace\xspace Z\xspace\xspace}$ \xspace \\ \hline
Statistical & $0.30$ & $0.33$ & $0.36$ & $0.31$ \\ \hline
Purity & $0.25$ & $0.35$ & $0.30$ & $0.30$ \\ 
Tracking  & $0.05$ & $0.22$ & $0.24$ & $0.23$ \\
Identification & $0.01$ & $0.11$ & $0.11$  & $0.11$ \\
Trigger & $0.04$ & $0.10$ & $0.09$ & $0.09$ \\
GEC & $0.13$ & $0.22$ & $0.23$ & $0.21$ \\
Selection  & $0.10$ & $0.24$ & $0.24$ & $0.23$ \\
Acceptance and FSR & $0.21$ & $0.21$ & $0.19$ & $0.17$  \\ \hline
Systematic & $0.37$ & $0.59$ & $0.56$ & $0.54$ \\ \hline
Beam energy & $0.14$ & $0.15$ & $0.29$ & $0.21$ \\ \hline
Total & $0.50$ & $0.69$ & $0.73$ & $0.66$ \\
\end{tabular}
\end{document}
