\begin{table}%t4
\caption{Small Magellanic Cloud atomic hydrogen and molecular\protect hydrogen column densities
from different sources.}
\label{tb:NH}
\small%\centerline
{
 {
\begin{tabular}{lllllll}\hline\hline
%&&&&&& \\[-8pt]
		  &  \multicolumn{5}{c}{\ion{H}{i} column density log $N$(\ion{H}{i}) cm$^{-2}$} & log $N$(H$_2$) cm$^{-2}$ \\ 
		  &  \ [1]	   & \ [2]  & \ [3]	    & \ [4]	& \ [5]     & \ [6]	    \\ \hline 
\object{AzV 456}  &21.60 $\pm$ 0.05  & 21.63  & 21.4 $\pm$ 0.1  & 21.18 	&	    & 20.93 (0.09)  \\			     
\object{AzV 18}   &21.93 $\pm$ 0.02  & 22.10  & 22.0 $\pm$ 0.1  & 21.95 	&  21.80    & 20.36 (0.07)  \\			     
\object{AzV 214}  &21.40 $\pm$ 0.08  & 21.81  & 21.9 $\pm$ 0.1  &	 	&	    &  	     \\  			    
\object{AzV 398}  &21.90 $\pm$ 0.10  & 21.85  & 22.2 $\pm$ 0.1  &	 	&	    &  	     \\ 			    
\object{AzV 65}   &		   & 22.01  &   	    &		&	    &		    \\  			   
\object{Sk 191}   &		   & --     & 21.6 $\pm$ 0.1  &		&  21.40    &		    \\  			   
\object{AzV 242}  &		   & 21.59  & 21.5 $\pm$ 0.1  &		&	    &  17.21$^{+1.00}_{-1.25}$ \\
\hline
\end{tabular}}}
\medskip
 [1] \citet{2003ApJ...594..279G} (via Ly$\alpha$); [2] \ion{H}{i} ATCA+PARKES survey 
    (\citealt{2000MNRAS.315..791S,2004ApJ...604..176S,1997MNRAS.289..225S}), 
    see Sect.~\ref{sec:atomic} and Fig.~\ref{fig:atomic1} (\ion{H}{i} 21~cm emission);
 [3] {\citet{1985AetA...149..330B}};  [4]~\citet{1985ApJS...59...77F} (via Ly$\alpha$);  [6] \citet{2005ApJ...630..355C}.
\end{table}