\begin{table}%t2
\caption{\label{tab:flux}Survey limiting flux in mCrab\textit{s} for source detection at the $5\sigma$~significance level (17$-$60~keV, $1~{\rm mCrab}=1.43$~$\times$ $10^{-11}$~\ergscm).}
%\centering
\par
\begin{tabular}{lccc}
\hline \hline \noalign{\smallskip}
Category & Nominal & Gen. method & Mod. method \\ 
\hline
     Lim. flux & 0.26 &  0.35 & 0.33 \\
     10\% sky & 0.60 &  0.70 & 0.63 \\
     90\% sky & 4.32 &  5.00 & 4.32 \\
\hline
\end{tabular}
\end{table}