\begin{table}%t1 \par %%%\centering \par \caption{Summary of the approximate limiting detection of the flux ratio $F_{\rm s} / F_{\rm p}$ with the different configurations mentioned in Sect.~\ref{simulation} without photon noise$^1$.\label{tab:gain}} %%\centerline {\begin{tabular}{lllll} \hline\hline Conditions & (A) & (B) & (C) & (D) \\ \hline Perfect conditions & $10^{3.2}$ & $10^{11.0}$ & $10^{11.0}$ & $10^{11.0}$ \\ $\lambda/100$ & $10^{3.5}$ & $10^{5.7}$ & $10^{7.6}$ & $10^{10.8}$ \\ $\lambda/20$ & $10^{3.5}$ & $10^{4.5}$ & $10^{6.2}$ & $10^{7.9}$ \\ \hline \end{tabular}} \medskip $^1$ ``$\lambda/100$'' and ``$\lambda/20$'' are referred to the gain after the introduction of wavefront bumpiness imperfection at $\lambda/100$ and $\lambda/20$ (Sect.~\ref{mirror}). \end{table}