\begin{table} %t2
      \caption{\label{tab2}The luminosity-redshift bins used for the alternatively 
        constructed test selection function.}  
   $$
         \begin{array}{lllllllll} 
            \hline  \hline 
            \noalign{\smallskip} 
 {\rm Bin~no.} & N_{\rm Cl} & L_{\rm X} ({\rm min}) & L_{\rm X} ({\rm max}) & z_{\rm min} & z_{\rm max} & z ({\rm excl.}) & z ({\rm excl.}) & z ({\rm excl.}) \\ 
(1) & (2) & (3) & (4) & (5) & (6) & (7) & (8) & (9) \\ 
            \noalign{\smallskip} 
            \hline 
            \noalign{\smallskip} 
1  & 4& 0.75 & 1.0 & 0.0550  & 0.06215 &  &  &  \\ 
2  & 4& 1.0  & 1.4 & 0.0794  & 0.08725 &  &  &  \\ 
3  & 4& 1.4  & 2.0 & 0.0920  & 0.1041  & (0.0926{-}0.09455) & (0.09665{-}0.09795) & (0.09865{-}0.09985) \\ 
4  & 4& 2.0  & 3.0 & 0.1077  & 0.12105 & (0.1102{-}0.1131) & (0.11835{-}0.1195) &  \\ 
5  & 4& 3.0  & 5.0 & 0.11145 & 0.1248  &  &  & \\ 
6  & 4& 5.0  & 7.0 & 0.1195  & 0.15215 & (0.1195{-}0.15685)^{*} &  & \\ 
7  & 4& 7.0  & 10  & 0.1161  & 0.16875 & (0.15135{-}0.16065) &  & \\ 
8  & 4& 10   & 20  & 0.0     & 0.1719  &  &  &  \\ 
9  & 1& 20   & 32  & 0.0     & 0.19925 &  &  &  \\   
            \noalign{\smallskip} 
            \hline 
         \end{array} 
     $$
\begin{list}{}{} 
\item[The first 6 columns have the same meaning as those in Table~\ref{tab2}, 
  where the luminosity bins are now given for a critical density] 
\item[Universe with a Hubble constant of $h_{100}=0.5$.] 
\item[$z_{\rm excl}$ give the redshift intervals of the regions to be 
  excluded due to unobserved clusters scattered into the bins.] 
\item[$^{*}$ gives the total redshift interval of the bins for a 
  Universe with critical density.]  
\end{list} 
\end{table}