\begin{table}%t1
 %\centering
\par
\caption{\label{tab1}Characteristics of the interference filters used in our observations.}                   
\small         
\begin{tabular}{c c c c l l l }     
\hline\hline                    
Name & $\lambda$ & {\it FWHM} \\
~ & Wavelength ($\AA$) & $\AA$ \\    
\hline                    
[S II] & 6728 & 54 \\  
continuum  &6964 & 350 \\
H$\alpha$   & 6563 & 80 \\
continuum   &6446 & 123  \\
\hline                  
\end{tabular}
\end{table}