\begin{table}%t2
\par
\caption {\label{tb:lss} Future LSS surveys characteristics (1) from
  Refregier et~al. (\cite{Refregier06}, \cite{Refregier08}) and the DUNE website; (2) and (3) from
  Pogosian et~al. (\cite{Pogosian05}) as ``conservative'' and ``goal'' cases
  respectively; (4) from the SNAP collaboration, the SNAP website 
  \protect\url{http://snap.lbl.gov/} and Aldering et~al. (\cite{Aldering07}); (5) from Stubbs 
    et~al. (\cite{Stubbs07}), Heavens et~al. (2007), and private communications with
    Phleps.  Planck characteristics used for the noise part of the
  signal-to-noise, and for the Fisher matrices analyses are also
  given. The values of~$z_{\rm med}$ for SNAP and~$\bar N$ for
  PanSTARRS are only indicative.}
%\centering
\par
\begin{tabular}{c c c c}
\hline\hline\\[-3mm]
 & $f_{\sky}$&$z_{\rm med}$&nbar (arcmin$^{-2})$\\
\hline
DUNE(1)& 49\%  & 0.9 & 40 \\
LSST-1(2) & 30\%  & 1 & 50     \\
LSST-2(3) & 49\%  & 1.8 & 70     \\
SNAP(4) & 1 \% & 1.8 & 100    \\
PanSTARRS(5) & 50\%  &  0.75  & 5   \\
\hline\\[-3mm]
PLANCK & $f_{\rm sky}=80\%$ & $\theta_{\rm beam}=7~{\rm arcmin}$& $\omega^{-1}_{\rm T} = 4\rm e^{-17} $ \\
\hline
\end{tabular}
\end{table}