\begin{table} %t4                                             
\caption{\label{Thi}Mean HI content according to morphological type. Notation as in Table~\ref{Tdust}.}
         %\centering
\par
\begin{tabular}{lrrrr}                                              
\hline   \hline   \noalign{\smallskip}                                      
Type  &  $t$  &  $N/N_{\rm ds}$  &  \mhi/\LB      &  \mhi/\area    \\
      &     &           &        &        \\
\noalign{\smallskip}    \hline  \noalign{\smallskip}                                                
E	&	$-$5	&	91/37	 &	$-$2.34	$\pm$	0.14	&	5.33	$\pm$	0.13	\\
E	&	$-$4	&	25/6 	 &	$-$1.83	$\pm$	0.12	&	5.54	$\pm$	0.14	\\
E/S0	&	$-$3	&	49/20	 &	$-$1.89	$\pm$	0.16	&	5.70	$\pm$	0.15	\\
S0	&	$-$2	&	134/75 &	$-$1.55	$\pm$	0.09	&	5.96	$\pm$	0.09	\\
S0a	&	$-$1	&	62/41	&	$-$1.81	$\pm$	0.19	&	5.58	$\pm$	0.19	\\
S0a	&	0	&	88/77	&	$-$0.96	$\pm$	0.06	&	6.47	$\pm$	0.06	\\
Sa	&	1	&	76/67	&	$-$1.05	$\pm$	0.07	&	6.52	$\pm$	0.07	\\
Sab	&	2	&	71/68	&	$-$0.95	$\pm$	0.06	&	6.57	$\pm$	0.06	\\
Sb	&	3	&	120/117 &	$-$0.77	$\pm$	0.04	&	6.78	$\pm$	0.03	\\
Sbc	&	4	&	106/104 &	$-$0.66	$\pm$	0.03	&	6.90	$\pm$	0.03	\\
Sc	&	5	&	107/104 &	$-$0.67	$\pm$	0.04	&	6.92	$\pm$	0.03	\\
Sc	&	6	&	74/74	&	$-$0.48	$\pm$	0.04	&	6.93	$\pm$	0.04	\\
Scd	&	7	&	37/36	&	$-$0.33	$\pm$	0.07	&	6.96	$\pm$	0.05	\\
Sd	&	8	&	13/13	&	$-$0.32	$\pm$	0.19	&	7.11	$\pm$	0.11	\\
Sm	&	9	&	23/23	&	$-$0.29	$\pm$	0.08	&	7.02	$\pm$	0.06	\\
Irr	&	10	&	35/34	&	$-$0.20	$\pm$	0.10	&	7.05	$\pm$	0.06	\\
      &     &           &        &        \\
\noalign{\smallskip}    \hline  \noalign{\smallskip}                                                
Total	&		&	1111/	896	&		&		\\
\end{tabular}  
\end{table}