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\begin{document}
  
  
  
  
  \begin{tabular*}{0.60\textwidth}{@{\hspace{10mm}}l@{\extracolsep{\fill}}c@{\hspace{10mm}}}
    Source                                 & Uncertainty $\left[\! {\mathrm{\,Me\kern -0.1em V\!/}c^2}\xspace\right]$
    \\
    \hline
     $\chi\xspace_{ b\xspace\xspace}$ \xspace~fit model                        &
    \\
    ~~ $\chi\xspace_{ b\xspace\xspace}$ \xspace~mass resolution                &  0.8
    \\
    ~~background model                     &  0.3
    \\
    ~~$m_{\chi\xspace_{ b\xspace\xspace 2}\mathrm{(3P)}\xspace}-m_{\chi\xspace_{ b\xspace\xspace 1}\mathrm{(3P)}\xspace}$      &  0.4
    \\
    ~~$\chi\xspace_{ b\xspace\xspace 1}\xspace/\chi\xspace_{ b\xspace\xspace 2}\xspace$~ratio            & $2.0$
    \\
    ECAL\xspace~energy scale                     &  1.0
    \\
    \Y3S mass uncertainty                   &  0.5 
  \end{tabular*}
\end{document}
