\begin{table}
  \caption{Properties of the mass-selected samples.}
  \label{tab:mass}
%
  %\centering
\par
  \begin{tabular}{lcclcc}
    \hline\hline
Sample   & Redshift & Mean     &\multicolumn{2}{c}{ $\log(M/M_\odot)$ }              & Number of \\
\cline{4-5}
         & range    & redshift &           Range       &          Median           & galaxies   \\
    \hline
M1.1     & 0.2--0.5  &  0.36    &   $\ge$9.0      &           9.80             &  2159    \\
M1.2     & 0.2--0.5  &  0.37    &   $\ge$9.5      &          10.09             &  1445    \\
M1.3     & 0.2--0.5  &  0.36    &   $\ge$10.0          &          10.36             &   827    \\
M1.4     & 0.2--0.5  &  0.37    &   $\ge$10.5          &          10.66             &   275    \\
    \hline
M2.1     & 0.5--0.8  &  0.66    &   $\ge$9.0      &           9.97             &  2831    \\
M2.2     & 0.5--0.8  &  0.66    &   $\ge$9.5      &          10.12             &  2276    \\
M2.3     & 0.5--0.8  &  0.67    &   $\ge$10.0          &          10.38             &  1366    \\
M2.4     & 0.5--0.8  &  0.67    &   $\ge$10.5          &          10.68             &   477    \\
    \hline
M3.1     & 0.8--1.0  &  0.90    &   $\ge$10.0          &          10.46             &   755    \\
M3.2     & 0.8--1.0  &  0.90    &   $\ge$10.5          &          10.73             &   344    \\
    \hline
  \end{tabular}
\end{table}