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\begin{document}
  \begin{tabular}{c c c}
    \hline
    Source of uncertainty                        & $\sqrt{s}\xspace = 7\mathrm{\,Te\kern -0.1em V}\xspace$   & $\sqrt{s}\xspace = 8\mathrm{\,Te\kern -0.1em V}\xspace$ \\ 
    \hline
    curvature/momentum scale          & 0.0102 & 0.0050 \\
    data/simulation mass resolution        & 0.0032 & 0.0025 \\
    unfolding parameter               & 0.0033 & 0.0009 \\
    unfolding bias                    & 0.0025 & 0.0025 \\ 
    \hline
  \end{tabular}
\end{document}
