\begin{table}%t4
%\centering
\par
\caption{Total column densities and logarithmic column density ratios for the 
         molecules in the $-8$~km~s$^{-1}$ component.
       \label{tab_mol_ratios} }
\begin{tabular}{lrrrrrrrr}
\hline\hline\noalign{\smallskip}
 & \object{HD~152200} & \object{HD~152219} & \object{HD~152234} & \object{HD~152249} & \object{HD~152270} & \object{HD~326329} & \object{CPD~-41~7712} & \multicolumn{1}{c}{Mean} \\
\noalign{\smallskip}\hline\noalign{\smallskip}
$E(B-V)$ &  0.43 & 0.46 & 0.45 & 0.44 & 0.46 & 0.44 & 0.46 \\
\noalign{\smallskip}\hline\noalign{\smallskip}
$\Sigma(\mbox{H}_2)$ & $\rm 20.37^{+0.01}_{-0.01}$ & $\rm 20.36^{+0.01}_{-0.01}$ & $\rm 20.43^{+0.01}_{-0.01}$ & $\rm 20.26^{+0.01}_{-0.01}$ & $\rm 20.44^{+0.01}_{-0.02}$ & $\rm 20.33^{+0.01}_{-0.01}$ & $\rm 20.50^{+0.01}_{-0.01}$ & \\
$\Sigma(\mbox{HD})$  & $\rm 14.72^{+0.09}_{-0.10}$ & $\rm 14.65^{+0.06}_{-0.05}$ & $\rm 14.69^{+0.03}_{-0.02}$ & $\rm 14.59^{+0.05}_{-0.05}$ & $\rm 14.66^{+0.07}_{-0.06}$ & $\rm 14.71^{+0.09}_{-0.08}$ & $\rm 14.80^{+0.08}_{-0.08}$ & \\
$\log f$ & $-0.66$ & $-0.79$ & $-0.69$ & $-0.90$ & $-0.78$ & $-0.80$ & $-0.67$ \\
\noalign{\smallskip}\hline\noalign{\smallskip}
H$_2$/HD & $\rm 5.65^{+0.09}_{-0.10}$ &  $\rm 5.71^{+0.06}_{-0.05}$ &  $\rm 5.74^{+0.03}_{-0.02}$ &  $\rm 5.67^{+0.05}_{-0.05}$ & $\rm 5.78^{+0.07}_{-0.06}$ & $\rm 5.62^{+0.09}_{-0.08}$ & $\rm 5.70^{+0.08}_{-0.08}$ & $5.70\pm0.05$\\
H$_2$/CO & $\rm 6.52^{+0.06}_{-0.12}$ & $\rm 6.58^{+0.08}_{-0.04}$ & $\rm 6.52^{+0.03}_{-0.02}$ & $\rm 6.44^{+0.05}_{-0.01}$ & $\rm 6.49^{+0.05}_{-0.03}$ & $\rm 6.34^{+0.11}_{-0.05}$ & $\rm 6.61^{+0.11}_{-0.06}$ & $6.50\pm0.09$ \\
\hline
\end{tabular}
\end{table}