\begin{table}%t4
\caption{\label{tab:massbinnumb}Summary of the four mass volume-limited data samples; {\it Mass} is in units of $\log ({\cal M}_*/({\cal M}_{\odot}\times h_{70}^{-2}))$.} 
%\centering
\small                 
\begin{tabular}{c c c c c }    
\hline\hline \noalign{\smallskip}                
                & Sample MM-I  & Sample MM-II & Sample MM-III & Sample MM-IV  \\   
 stellar mass range  & $10.0 \leq {\it Mass}\leq 10.5 $ & $10.3 \leq {\it Mass}\leq 10.8 $ & $10.6 \leq {\it Mass}\leq 11.1 $  & $ 10.9 \leq {\it Mass}\leq 11.4 $ \\
    $z$ range   & $0.1\leq z\leq0.45$ & $0.1\leq z\leq0.6$ & $0.1\leq z\leq0.8$ & $0.1\leq z\leq 0.9$ \\                  
\hline                     
All galaxies       &     437   &   617     &   885    &   477  \\      
Isolated galaxies  &      64   &   101     &   117    &    45  \\
Group galaxies I   &     174   &   221     &   330    &   132  \\
Group galaxies II  &      56   &    95     &   187    &   132  \\
\hline                             
\end{tabular}
\end{table}