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\begin{document}
\begin{tabular}{lc}
\toprule[1.0pt]
Source&Value ($ {\mathrm{\,Me\kern -0.1em V\!/}c^2}\xspace$)\\
\midrule[1.0pt]
Momentum scale&0.40\\
Energy loss&0.05\\
Final state radiation&0.03\\
Fit model&0.10\\
\midrule[1.0pt]
Total&0.42\\
\bottomrule[1.0pt]
\end{tabular}
\end{document}
