\begin{table}%t1
\caption{\label{table:Tab1}Selection of volume-limited subsamples with evolving-luminosity.}             % title of Table
%\centering
                          % used for centering table
\begin{tabular}{l c}        % centered columns (4 columns)
\hline\hline                 % inserts double horizontal lines
Luminosity limits &  $z$ intervals\\    % table heading 
\hline                        % inserts single horizontal line
   m1 = --18.5 $-z$   &	$0.2 < z < 0.5$ \\	  % inserting body of the table
   m2 = --19 $-z$     &	$0.2 < z < 0.5$ \\
   m3 = --19.5 $-z$   &	$0.2 < z < 0.8$ \\
   m4 = --20 $-z$     &	$0.2 < z < 0.8$ \\
   m5 = --20.5 $-z$   &	$0.2 < z < 0.8$ \\
   m6 = --21 $-z$     &	$0.2 < z < 1.0$ \\
\hline                                   %inserts single line
\end{tabular}
\end{table}