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\begin{document}
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\begin{tabular}{lc}
    \hline
    Source & Uncertainty [$\text{\,Me\kern -0.1em V}\xspace$]\\
    \hline
    Momentum scale calibration & $0.27$\\
    Energy loss correction & $0.03$\\
    Fit model & $0.01$\\
    \hline
    Total  & 0.27\\
    \hline
    External input masses  & 0.30\\
    \hline
  \end{tabular}
\end{document}
