\begin{table}%T6
\caption{\label{peaks}List of observed peaks in the redshift distribution of the reference 
master catalog. }
\small%\centering
\par
\begin{tabular}{c c c c c}
\hline
\hline\noalign{\smallskip}
$\langle z\rangle$ & $\sigma_V$~[km~s$^{-1}$] &  $z_{\rm min}-z_{\rm max}$ & $N$  & XID \\
(1)      & (2)     &   (3)                 &  (4)    & (5)    \\
\hline
0.126 &   906	   &  $0.119{-}0.133$ &  73     & --   \\
0.215 &   443	   &  $0.211{-}0.218$ &  61     & --   \\
0.338 &  1724	   &  $0.322{-}0.353$ &  76     & --   \\
0.530 &  2190	   &  $0.508{-}0.552$ & 193     & --   \\
0.672 &  1758	   &  $0.653{-}0.692$ & 306     & 645 \\
0.735 &   565	   &  $0.728{-}0.742$ & 257     & 566, 594  \\
0.973 &  2936	   &  $0.935{-}1.012$ & 181     & 249 \\
1.039 &   859	   &  $1.028{-}1.051$ & 110     & --   \\
1.095 &  1536	   &  $1.074{-}1.117$ & 129     & --   \\
1.221 &   391	   &  $1.215{-}1.227$ &  65     & --   \\
1.296 &   261	   &  $1.292{-}1.300$ &  35     & --   \\
1.611 &   497	   &  $1.602{-}1.620$ &  36     & --   \\
2.318 &  2102	   &  $2.272{-}2.365$ & 108     & --   \\
2.566 &  1435	   &  $2.532{-}2.601$ &  72     & --   \\
2.811 &   575      &  $2.796{-}2.825$ &  23     & --   \\
3.471 &   984	   &  $3.442{-}3.501$ &  29     & --   \\
3.702 &   360	   &  $3.691{-}3.714$ &  11     & --   \\
\hline
\end{tabular}
\tablefoot{The columns list: (1) the average $\langle z\rangle$ of each peak; (2)~the velocity dispersion $\sigma_V$; (3)~the redshift range corresponding 
to $\pm${}$2\sigma_V$, selected for the analysis of the spatial distribution 
(see Figs.~\ref{654},~\ref{736}, and~\ref{280}); (4)~the number of galaxies in the selected redshift
interval; and (5) the identification numbers of extended X-ray sources 
\citep[from ][]{gia02} associated with the peak.}
\end{table}