\begin{table}%t1 
%\centering
\par
\caption{Evolution of the number of photons, limiting magnitudes and Strehl ratio in function of the number of apertures and in function of the considered mode. Imaging and
coronagraphic modes require respectively precision of $\lambda/4$ and $\lambda/100$. From left to right: 1-~number of apertures; 2-~minimum, imaging or coronagraphic modes; 3-~number of photons needed to achieve the required precision; 4-~limiting stellar
magnitude for an optical bandwidth of $\Delta\lambda = 4000$~\AA and for a constant aperture diameter of 8~m; 5-~limiting stellar magnitude for a collecting surface of 150~m$^2$ ($\pi*(8/2)^2*3)$; 6-~Strehl ratio.} \label{all}
\begin{tabular}[r] {l|cc|cc|c}
\hline\hline \multicolumn{1}{l|}{} &\multicolumn{1}{c}{}&
\multicolumn{1}{c}{} & \multicolumn{2}{|c}{Limiting
magnitudes}
& \multicolumn{1}{|c}{}\\
\multicolumn{1}{l|}{}
&\multicolumn{1}{c}{}&\multicolumn{1}{c}{} &
\multicolumn{2}{|c}{($\Delta\lambda=4000$~\AA) } & \multicolumn{1}{|c}{}\\
Number & Mode & Number &  &  & Strehl \\
of &  &   of photons  &  &    &  (in \%)\\
apertures  &  & needed   & $d= 8$~m & $S_{\rm coll}= 150$~m$^2$  & \\
  &  & per cube     &  &      & \\
\hline 
  & Minimum & 64& 20.4 & 20.4 & 83  \\
%\cline{2-6}
3 & Imaging & 960 &17.4 & 17.4 & 94 \\
%\cline{2-6}
 & Coronagraphy & 32~000 & 13.6 & 13.6& 100 \\
\hline
 & Minimum & 64 & 20.7 &20.7 &  52\\
%\cline{2-6}
4 & Imaging & 3200 &16.4 & 16.1& 95 \\
%\cline{2-6}
 &  Coronagraphy & 96~000 &12.7 & 12.4& 98\\
\hline
 & Minimum &160 &19.9 &19.6 & 63\\
%\cline{2-6}
5 & Imaging &  6400 & 15.9 & 15.4&94 \\
%\cline{2-6}
 &Coronagraphy & 160~000 & 12.4& 11.7& 97  \\
\hline
 & Minimum & 320 &19.4 &18.6 &  63\\
%\cline{2-6}
6 &imaging & 16~000 &15.1 &14.4 & 90 \\
%\cline{2-6}
 &Coronagraphy &  160~000 & 12.6& 11.9& 97 \\
\hline
 & Minimum & 640 &18.8 & 17.6&  64\\
%\cline{2-6}
7 & imaging & 32~000 &14.5 &13.6 & 93 \\
%\cline{2-6}
 & Coronagraphy & 224~000 & 12.4 & 11.5& 97 \\
\hline
 & Minimum & 960 &18.5 &17.4 & 45\\
%\cline{2-6}
8 & Imaging &  32~000 & 14.7& 13.6& 93 \\
%\cline{2-6}
 &  Coronagraphy & 224~000 & 12.6&11.5 & 96 \\
\hline
 & Minimum & 960 & 18.6& 17.4& 47\\
%\cline{2-6}
9 & Imaging & 32~000 &14.8 &13.6 & 84 \\
%\cline{2-6}
 &Coronagraphy & 224~000 &12.7 &11.5 & 98  \\
\hline
 & Minimum &  1600& 18.2 &16.9 &  63\\
%\cline{2-6}
10 &  Imaging &  32~000 & 14.8  & 13.6& 81 \\
%\cline{2-6}
 &  Coronagraphy & 320~000 & 12.41 &11.1 & 95 \\
\hline
\end{tabular}
\end{table}