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\begin{document}
   
  
  
  \begin{tabular*}{0.65\textwidth}{@{\hspace{10mm}}l@{\extracolsep{\fill}}cc@{\hspace{10mm}}}
    Signal yield & $\sqrt{s}\xspace=7\,\mathrm{TeV}$
    & $\sqrt{s}\xspace=8\,\mathrm{TeV}$ \\ 
    \hline
    $N_{\Y1S}$ & 326\,300 $\pm$ 638 & 747\,610 $\pm$ 969\\
    $N_{\Y2S}$ & 100\,620 $\pm$ 395 & 229\,950 $\pm$ 576\\
    $N_{\Y3S}$ & \phantom{0}57\,613 $\pm$ 312 & 129\,450 $\pm$ 459\\
  \end{tabular*}
\end{document}
