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\begin{table}[hhh]
\begin{center}
\begin{tabular}{|c|c|c|c|c||} \hline
 & \multicolumn{2}{|c|}{W search cuts and $P_T^X>25$~GeV} &  \multicolumn{2}{c|}{Top selection}  \\ \hline 
 &  Electron Channel &  Muon Channel
 &  Electron Channel &  Muon Channel \\
 \hline \hline
Data      &       4           &   6           &     3              &   
2            \\ \hline \hline
Total SM  &     $1.29\pm 0.33$ & $1.54\pm 0.41$ &  $0.75\pm 0.18$  & 
$0.77\pm 0.21$ \\ \hline
W only    &     $1.05\pm 0.32$ & $1.29\pm 0.39$ &  $0.51\pm 0.16$  & 
$0.68\pm 0.19$ \\ \hline
Top efficiency & 43\%   & 51\%  & 37\% & 45\% \\ \hline
\end{tabular}
\caption{Observed and predicted number of events with isolated leptons and missing transverse momentum for $e^+p$ data in $101.6$ pb$^{-1}$}
\label{tableback1}
\end{center}
\end{table}

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