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\begin{document}
  
  
  
  
  \begin{tabular*}{0.65\textwidth}{@{\hspace{10mm}}l@{\extracolsep{\fill}}cc@{\hspace{10mm}}}
    Decay mode & $\sqrt{s}\xspace=7\,\mathrm{TeV}$
    & $\sqrt{s}\xspace=8\,\mathrm{TeV}$ \\ 
    \hline
    $N_{\chi\xspace_{ b\xspace\xspace}\mathrm{(1P)}\xspace\!\rightarrow\xspace \Y1S\gamma\xspace\xspace\xspace}$    &           1908 $\pm$ 71 & 4608 $\pm$ 115\\
    $N_{\chi\xspace_{ b\xspace\xspace}\mathrm{(2P)}\xspace\!\rightarrow\xspace \Y1S\gamma\xspace\xspace\xspace}$    & \phantom{0}390 $\pm$ 41  & \phantom{0}904 $\pm$ 68\phantom{0}\\
    $N_{\chi\xspace_{ b\xspace\xspace}\mathrm{(3P)}\xspace\!\rightarrow\xspace \Y1S\gamma\xspace\xspace\xspace}$  & \phantom{0}133 $\pm$ 31  & \phantom{0}196 $\pm$ 50\phantom{0}\\
    $N_{\chi\xspace_{ b\xspace\xspace}\mathrm{(2P)}\xspace\!\rightarrow\xspace \Y2S\gamma\xspace\xspace\xspace}$    & \phantom{0}265 $\pm$ 30 & \phantom{0}660 $\pm$ 46\phantom{0}\\
    $N_{\chi\xspace_{ b\xspace\xspace}\mathrm{(3P)}\xspace\!\rightarrow\xspace \Y2S\gamma\xspace\xspace\xspace}$  & \phantom{00}48 $\pm$ 17 & \phantom{00}73 $\pm$ 26\phantom{0}\\
    $N_{\chi\xspace_{ b\xspace\xspace}\mathrm{(3P)}\xspace\!\rightarrow\xspace \Y3S\gamma\xspace\xspace\xspace}$ & \phantom{00}56 $\pm$ 12 & \phantom{0}126 $\pm$ 20\phantom{0}
  \end{tabular*}
\end{document}
