\begin{table}%T5
\caption{\label{coresabund}Abundances of SO, SO$_2$, H$_2$S, SiO and H$_{2}$CO with
respect to~H$_{2}$ in the hot core of IRAS~16293.
The abundances of~SO, SO$_2$ and~H$_2$S are estimated by the present work
observations, assuming a H$_2$~column density of
$7.5 \times 10^{22}~\rm cm^{-2}$ \citep{2000AetA...355.1129C}.
The SiO and~H$_{2}$CO~abundances are taken from \citet{2000AetA...355.1129C,2000AetA...357L...9C}.
References of the other sources:
L1157-mm (IRAS~ 20386+6751): \citet{1997ApJ...487L..93B};
Orion-KL: SO, SO$_{2}$, SiO and~H$_{2}$CO from \citet{1995ApJS...97..455S},
H$_{2}$S from \citet{1990ApJ...360..136M};
G10.47, G29.96, G75.78, G9.62, G12.21, G31.41 and G34.26:
\citet{1998AetA...338..713H}; BF-Class 0: 
\citet{2003AetA...399..567B}.}
%\centering
\par
\begin{tabular}{lccccc}
\hline\hline
     & SO/H$_2$ & SO$_{2}$/H$_2$ & H$_{2}$S/H$_2$ & SiO/H$_2$ &
H$_{2}$CO/H$_2$ \\
\hline
IRAS~16293 & $1.7 \times 10^{-6}$ & $5.4 \times 10^{-7}$ & $5.3 \times
10^{-7}$ & $1.5 \times 10^{-8}$ & $1.0 \times 10^{-7}$ \\
L1157-mm & $5.0 \times 10^{-9}$ & $3.0 \times 10^{-8}$ & $1.1 \times
10^{-8}$ & -- & $4{-}6 \times 10^{-9}$ \\
Orion-KL & $1.5 \times 10^{-7}$ & $9.4 \times 10^{-8}$ & $5.0 \times
10^{-6}$ & $6.0 \times 10^{-9}$ & $7.0 \times 10^{-9}$  \\
G10.47 & $3.0 \times 10^{-9}$ & $1.8 \times 10^{-8}$ & $\ge$$4.0 \times
10^{-9}$ & -- & -- \\
G29.96 & $\ge$$5.0 \times 10^{-9}$ & $2.0 \times 10^{-8}$ & $\ge$$1.5 \times
10^{-8}$ & -- & -- \\
G75.78 & $3.0 \times 10^{-9}$ & $\ge$$2.0 \times 10^{-9}$ & $\ge$$1.0 \times
10^{-9}$ & -- & -- \\
G9.62 & $\ge$$4.0 \times 10^{-9}$ & $1.0 \times 10^{-8}$ & $\ge$$8.0 \times
10^{-9}$ & -- & -- \\
G12.21 & $\ge$$8.0 \times 10^{-10}$ & $\ge$$5.0 \times 10^{-10}$ & -- & -- & -- \\
G31.41 & $4.0 \times 10^{-9}$ & $1.2 \times 10^{-8}$ & $\ge$$3.0 \times
10^{-9}$ & -- & -- \\
G34.26 & $6.0 \times 10^{-9}$ & $1.5 \times 10^{-8}$ & $\ge$$2.0 \times
10^{-9}$ & -- & -- \\
BF-Class 0 & $3.0 \times 10^{-9}$ & $4.0 \times 
10^{-10}$ & $2.0 \times 
10^{-9}$ & -- &  --\\ 
\hline
\end{tabular}
\end{table}