\begin{table} %T3                                             
\caption{\label{Tdust} Mean warm dust content according to morphological type. $N$~represents the 
total number of galaxies which have data (detections and upper limits), while $N_{\rm ds}$ 
indicates the number of detections resulting from the survival analysis 
statistics. When upper limits exist, mean values are 
derived making use of survival analysis. All values are normalized to \LB, the 
corrected blue luminosities, and to \area, the square of the diameter in kpc 
at the isophote of~25~\sbu.}                                              
%\centering
\par
\begin{tabular}{lrrrr}                                              
\hline \hline \noalign{\smallskip}                                             
Type  &  $t$  &  $N/N_{\rm ds}$ &  \md/\LB         &  \md/\area      \\
      &     &          &          &         \\
\noalign{\smallskip}     \hline   \noalign{\smallskip}                                                E	&	$-$5	&	259/98 &	$-$5.99	$\pm$	0.12	&	1.53	        $\pm$	0.13	\\	
E	&	$-$4	&	118/47 &	$-$5.60	$\pm$	0.13	&	1.94	   $\pm$	0.14	\\	
E/S0	&	$-$3	&	171/89 &	$-$5.19	$\pm$	0.09	&	2.42	     $\pm$	0.09	\\	
S0	&	$-$2	&	269/156 &	$-$4.97	$\pm$	0.07	&	2.51	    $\pm$	0.08	\\
S0a	&	$-$1	&	87/69	&	$-$4.63	$\pm$	0.13	&	2.79	$\pm$	0.12	\\
S0a	&	0	&	108/95 &	$-$4.34	$\pm$	0.08	&	3.10	$\pm$	0.08	\\
Sa	&	1	&	82/80	&	$-$4.07	$\pm$	0.06	&	3.49	$\pm$	0.06	\\
Sab	&	2	&	68/67	&	$-$3.82	$\pm$	0.05	&	3.70	$\pm$	0.05	\\
Sb	&	3	&	117/113 &	$-$3.75	$\pm$	0.04	&	3.83	$\pm$	0.05	\\
Sbc	&	4	&	96/91	&	$-$3.74	$\pm$	0.03	&	3.83	$\pm$	0.04	\\
Sc	&	5	&	102/97 &	$-$3.78	$\pm$	0.03	&	3.82	$\pm$	0.04	\\
Sc	&	6	&	50/49	&	$-$3.92	$\pm$	0.05	&	3.58	$\pm$	0.07	\\
Scd	&	7	&	24/24	&	$-$4.09	$\pm$	0.07	&	3.34	$\pm$	0.09	\\
Sd	&	8	&	8/8	&	$-$4.50	$\pm$	0.23	&	3.13	$\pm$	0.24	\\
Sm	&	9	&	13/13	&	$-$4.40	$\pm$	0.21	&	3.04	$\pm$	0.24	\\
Irr	&	10	&	15/14	&	$-$4.12	$\pm$	0.16	&	3.43	$\pm$	0.19	\\
  &    &        &        &        \\
\noalign{\smallskip}\hline \noalign{\smallskip}                                             
Total	&		&	1587/1110 &  &	\\					
\end{tabular}                                                                                
\end{table}