\begin{table}%T3
\caption{\label{ColumnDens}Gas temperature and density, and column densities of~SO, SO$_2$, H$_2$S, SiO and~$\rm H_{2}CO$ in six "key'' positions.
The column densities are beam-averaged in the shocked regions (on 27$''$ 
for~SiO, 26$''$ for H$_{2}$CO, 24$''$ for SO, 18$''$ for~SO$_{2}$ and~25$''$ for~H$_{2}$S),
whereas they are corrected from the beam dilution in IRAS~16293.
Errors on the estimates are around~15\% if considering only the statistical
uncertainties. However, a factor two of uncertainty has to be considered,
when the uncertainty on the density and temperature of the emitting
gas is considered.}
%\centering
\par
\begin{tabular}{c|cc|ccccc}
\hline\hline
          & Density & $T$  &
            $N_{\rm SO}$ & $N_{\rm SO_2}$ & $N_{\rm H_2S}$ & $N_{\rm SiO}$ & $N_{\rm H_{2}CO}$ \\
               & ($10^{5}~\rm cm^{-3}$) & (K) & ($10^{13}~\rm cm^{-2}$) &
               ($10^{13}~\rm cm^{-2}$) & ($10^{13}~\rm cm^{-2}$) &
               ($10^{13}~\rm cm^{-2}$)& ($10^{13}~\rm cm^{-2}$) \\
\hline
IRAS~16293 & 250 & 100  & 13~000 & 4100 & 4000 & 110 & 750\\
E1      &  1.8 & 150  & 15 & 7.3 & $\leq$96 & 0.42 & 7.0\\
E2(LVC) & 1.0 & 150 & 3.2 & $\leq$0.44 & $\leq$260 & 0.21 & $\leq$0.86 \\
E2(HVC) & 0.4 & 100 & 7.8 & $\leq$1.1 & $\leq$1200 & 1.0 & $\leq$1.8 \\
W1      & 2.6 & 150  & 24 & 2.4 & $\leq$72 & 0.15 & 3.4\\
W2      & 1.8 & 80  & 8.7 & 2.9 & $\leq$76 & 0.15 & 3.6 \\
Cloud     & 0.3 & 26  & 30--80 & 2 & 1.5 & 0.02 & 2 \\
\hline
\end{tabular}
\end{table}