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\begin{document}
  
  
 
\begin{tabular*}{0.75\textwidth}{@{\hspace{5mm}}l@{\extracolsep{\fill}}ccc@{\hspace{5mm}}}
  \multirow{2}*{~~~Mode}
  &  \multirow{2}*{$N_{\mathrm{B}}$}
  &  $\mathrm{M}_{\mathrm{B}}$ 
  &  $\sigma_{\mathrm{B}}$ 
  \\
  & 
  &  $\left[ {\mathrm{\,Me\kern -0.1em V\!/}c^2}\xspace\right]$ 
  &  $\left[ {\mathrm{\,Me\kern -0.1em V\!/}c^2}\xspace\right]$ 
  \\
  \hline
  $ B\xspace\xspace^0_ s\xspace\xspace\xspace\rightarrow\xspace { J\xspace\mskip -3mu/\mskip -2mu\psi\xspace\mskip 2mu}\xspace\eta\xspace$
  &  $   863\pm52 $   
  &  $5370.9\pm2.3$   
  &  $33.7  \pm2.3$ 
  \\
  $ B\xspace\xspace^0_ s\xspace\xspace\xspace\rightarrow\xspace\psi\xspace{(2\mathrm{S})}\xspace\eta\xspace$
  &  $\phantom{0}76\pm 12$  
  &  $5373.4\pm 5.0$  
  &   $26.6$~fixed
\end{tabular*}
\end{document}
