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\documentclass[12pt]{article}
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\begin{document}
\pagestyle{empty}
\begin{table}
\begin{center}
\begin{tabular}{|l||c|}
\hline
    &Efficiency\\
\hline
\hline
$P_{T}^X>$0 GeV      &0.38\\
\hline
$P_{T}^X>$12 GeV     &0.27\\
\hline
$P_{T}^X>$25 GeV    &0.27\\
\hline
$P_{T}^X>$40 GeV    &0.27\\
\hline
\end{tabular}
\end{center}
\end{table}
\end{document} 
