\begin{table}%t1
%\centering
\par
\caption{\label{tab:neff}Effective galaxy number counts per square arcmin behind clusters with different masses and redshifts.}
\begin{tabular}{lcccc}
\hline \hline\noalign{\smallskip}
 & $z_{\rm l}=0.2$ & $z_{\rm l}=0.4$ & $z_{\rm l}=0.6$ & $z_{\rm l}=0.8$ \\
\hline\noalign{\smallskip}
$M=1\times 10^{15}\;h^{-1}~M_\odot$ & 154/61 & 140/52 & 157/55 & 179/59 \\
$M=7\times 10^{14}\;h^{-1}~M_\odot$ & 143/57 & 143/53 & 151/52 & 180/60 \\ 
\hline
\end{tabular}
\end{table}