\begin{table}%t2
\par
\caption{\label{Tabcomp}Coma I and Virgo clouds properties.}
 {
\begin{tabular}{cccccccc}
\hline\hline
\noalign{\smallskip}
Cloud		& N.$^a$	& Extension 		& S\%$^b$ 	&  $\sigma _{\rm vel} \rm (km~ s^{-1})$ 	& HI-def	\\
\hline
Coma I		& 115(55)	& $\sim$250$^{o2}$	& 68		&  307			& 0.06~$\pm$~0.44	\\ 
Virgo~W		& 173(37)	& $\sim$12$^{o2}$	& 54		&  437$^c$		& 0.63~$\pm$~0.68	\\
Virgo~M		& 39(23)	& $\sim$4$^{o2}$	& 62		&  666$^c$		& 0.24~$\pm$~0.57	\\	
\hline
\end{tabular}
}
\smallskip
Notes:  
$^a$: number of cataloged objects to mag $\leq$18; the number in parenthesis gives the late-type objects with HI data. \\
$^b$: spiral fraction to $M_B$~$\leq$~--15. \\
$^c$: from Gavazzi et~al. (\cite{Gavazzi99}).
\end{table}