\begin{table}%T7
\caption{\label{irasab}Observed and modelled abundances of SO, SO$_2$, H$_2$S, OCS
and CS towards the IRAS~16293-2422 hot core.}
%\centering
\par
         \begin{tabular}{l|ccc}
\hline\hline
Species & observed & model~2 & model~$2'$ \\
\hline
 SO	& $1.7\times 10^{-6}$ & $5\times 10^{-7}$ & $4\times 10^{-7}$ \\
SO$_2$	& $5.4\times 10^{-7}$ & $10^{-7}$ & $10^{-7}$ \\
H$_2$S	& $5.3\times 10^{-7}$ & $10^{-7}$ & $10^{-7}$\\
OCS 	& $1\times 10^{-6}$ & $2\times 10^{-7}$ & $10^{-7}$ \\
CS	& -- & $1\times 10^{-11}$ & $2\times 10^{-12}$ \\
\hline
\end{tabular}
\end{table}