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\begin{document}
\begin{tabular}{|c|c|c|}\hline
Run 3 & Run 4 & HL-LHC total \\ 
\hline 
23  $\text{\,fb}\xspace^{-1}$ \xspace & 50  $\text{\,fb}\xspace^{-1}$ \xspace & 300  $\text{\,fb}\xspace^{-1}$ \xspace \\\hline
\end{tabular} 
\end{document}
