\begin{table}%t4
 \caption{Extinction parameter for individual galaxies in both samples. 
The two distributions are similar, given the small statistics,
 and cover the same range.\label{list_Av}} 
\par
%\centering
\par
 \begin{tabular}{llllll}
\hline  \hline
   Sample&Nb&$<A_V>$&$A_V$min&$A_V$max&Disp\\
   name&of spect.&&&&\\
   \hline
   FSM&33&2.88&0.18&7.1&1.5\\
   IRAS&17&2.71&0.51&6.8&2\\
   \hline	
 \end{tabular}
\end{table}