\begin{table}%t4
\caption{\label{surveys}Characteristics of the three surveys discussed in the text,
  assuming an efficient 1.5~m space telescope with an obscuration of
  0.6~m and a total telescope throughput (CCD, mirror, grism) of 70\%
  using a survey efficiency of 75\%.}
\par
%\centerline
{\small
\begin{tabular}{cccc} 
\hline\hline
& DEEP-vis-NIR & DEEP-NIR & WIDE-NIR \\
probe & WL & WL & BAO \\
\hline
$T_{\rm obs}$ & 240~ks & 240~ks & 1200~s\\
$\lambda$ in $\mu$m & 0.6--1.7 & 1--1.7 & 1--1.7 \\
3$\sigma$ at 1.2~$\mu$m & $5\times 10^{-18}$ & $5\times 10^{-18}$ & $1\times 10^{-16}$ \\
& & ergs\ cm$^{-2}$~s$^{-1}$ & \\
area needed & 10~deg$^2$ & 10 deg$^{2}$ & 20~000 deg$^{2}$\\
mission time & 0.2 yrs & 0.2 yrs & 2 yrs\\
& & FOV of  0.5 deg$^{2}$ & \\ 
nbr density (5$\sigma$)& 60 & 35 & 5\\
& & gal/arcmin$^{2}$ & \\
$z$[1line$3\sigma$] & $0<z<3.5$ & $0.5<z<3.5$ & $0.5<z<1.5$\\
$m_{\rm lim}$ [1line$3\sigma$] & $I\sim 27$ & $I\sim 26.5$ & $H\sim 22$ \\
\%[1line$3\sigma$] Ell & 40 & 27 & 0\\
\%[1line$3\sigma$] Sac & 60 & 51 & 1\\
\%[1line$3\sigma$] Sdm & 77 & 63 & 10\\
\%[1line$3\sigma$] SB & 95 & 74 & 45\\
\hline
\end{tabular}}
\par
\medskip
The \%[1line$3\sigma$] Ell
  represent the percentage of Elliptical galaxies spectroscopically
  found using a success criterion of 1 line detected at $3\sigma$
  compared to the total population of Elliptical galaxies. With the
  same criterion, we define the percentage of Sac for early spiral
  galaxies, Sdm for late spiral galaxies, and SB for starburst galaxies.
\end{table}