\begin{table}%t1
\par
\caption {\label{tab1}CTIO-MOSAIC (above) and VLT-FORS~2 (below) imaging characteristics.}             % title of Table
      % is used to refer this table in the text
%\centering
                          % used for centering table
\begin{tabular}{l c c c}        % centered columns (4 columns)
\hline\hline                 % inserts double horizontal lines
Filter & $\lambda_{\rm c}$ (\AA) & {\it FWHM} (\AA) & Exp. time (s)  \\    % table heading 
\hline                        % inserts single horizontal line
${\rm [O~III]}$ & 4990 & 50 & 8 $\times$ 1200 \\      % inserting body of the table
D51 & 5130 & 154 & 4 $\times$ 900 \\
H$\alpha$ & 6563 & 80 &  2 $\times$ 1200  \\
H$\alpha$+8 & 6650 & 80 & 2 $\times$ 1200 \\
\hline
${\rm [O~III]}$ & 5045 & 59 & 960 \\
$V_{\rm Bess}$ & 5540 & 1115 & 60 \\
H$\alpha$ & 6604 & 64 & 960 \\
$R_{\rm special}$ &  6550 & 1650 & 60 \\
\hline                                   %inserts single line
\end{tabular}
\end{table}