\begin{table}%t8
\caption{Total molecular column densities towards the SW~and NE~absorption.} \label{ncol}
\small%\centering
\par
\begin{tabular}{ccccccccc}
\hline \hline
               & $\mu$   & $S_{ul}$ & $g_u$ & $A_{ul}$      & $E_{J,low}$ & $Q$(5.14 K) & $\mathcal{N}_{SW}$  & $\mathcal{N}_{NE} $ \\
               & (Debye) &          &       & (10$^{-4}$ s$^{-1}$)    & (K)  & & (10$^{12}$ cm$^{-2}$) & (10$^{12}$ cm$^{-2}$) \\
\hline\noalign{\smallskip}
HCO$^+$        & 3.90    & 2        & 5     & 4.02  & 4.3   & 2.77    & 300 (23)   & 11.4 (0.1)  \\
H$^{13}$CO$^+$ & 3.90    & 2        & 5     & 3.70  & 4.2   & 2.83    & 11.1 (0.2)    & $\leq$0.25   \\
HC$^{18}$O$^+$ & 3.90    & 2        & 5     & 3.50  & 4.1   & 2.88    & 5.1 (0.3)         & --   \\
HC$^{17}$O$^+$ &         &          &       &       &       &         & 0.4 (0.1)  & -- \\
HCN            & 2.99    & 2        & 5     & 2.32  & 4.3   & 2.78    & 289 (25)  & 12.3 (0.7) \\
H$^{13}$CN     & 2.99    & 2        & 5     & 2.14  & 4.1   & 2.84    & 10.7 (0.5)           & $\leq$0.5  \\
HC$^{15}$N     & 2.99    & 2        & 5     & 2.13  & 4.1   & 2.85    & 2.1 (0.1)            & --  \\
HNC            & 3.05    & 2        & 5     & 2.58  & 4.4   & 2.73    & 129.0 (0.5)         & 3.7 (0.2) \\
HN$^{13}$C     &     &        &     &  &   &    & 4.8 (0.4)    & --   \\
H$^{15}$NC     &     &         &     &   &   &     & 1.0 (0.2)  &  --  \\
DNC            & 3.05    & 2        & 5     & 1.54  & 3.7   & 3.17    & $\leq$0.7             & --  \\
CS             & 1.96    & 4        & 9     & 1.50  & 14.1  & 4.72    & 560 (7)            & 13 (4)  \\
C$^{34}$S      & 1.96    & 4        & 9     & 1.42  & 13.9  & 4.79    & 53 (4)             & --    \\
H$_2$S         & 0.97    & 4.5      & 9     & 0.26  & 19.8  & 1.28   & 1104 (15)   & $\leq$17 \\
H$_2^{34}$S    &     &       &     &   &   &     & 110 (11)  & --   \\\noalign{\smallskip}
\hline
\end{tabular} 
\end{table}