\begin{table}%t4
\caption{\label{tab4}Calculated total column densities of the observed interstellar features.}
\small%\centerline
 {
\begin{tabular}{rrrrrr}
\hline\hline
HD/Obs      & $N$(OH)          &   $N$(CH)           &   $N$(CH$^{+}$)          &   $N$(CN)           & $N$(H$_{2}$)\\
 & [10$^{12}$ cm$^{-2}$] & [10$^{12}$ cm$^{-2}$] &  [10$^{12}$ cm$^{-2}$] & [10$^{12}$ cm$^{-2}$] &[10$^{20}$ cm$^{-2}$]\\
% & & & & &\\
 \hline
23180   B   &39.00  $^{a}$          &   22.24   $\pm$   2.91    &   7.89    $\pm$   0.63        & 1.82  $\pm$   0.12      & 4.00$^{g}$\\
24398   B   & 40.50 $\pm$ 4.00$^{b}$&   22.30   $\pm$   2.61    &   4.28    $\pm$   1.84        &3.12   $\pm$   0.18      & 4.70$^{g}$\\
27778   B   &102.00 $\pm$ 4.00$^{b}$&   39.93    $\pm$  4.10    &   10.55   $\pm$   0.63        &26.76  $\pm$   4.12$^{f}$& 6.17$^{h}$\\
34078 G/B& 35.00$\pm$ 4.00$^{c}$& 79.27    $\pm$  4.82    &   57.28   $\pm$   2.25$^{d^{\prime}}$  &2.16   $\pm$   0.05      & 6.40$^{c}$\\ 
147889  u   &252.36 $\pm$ 30.74     &   100.33  $\pm$   5.87    &   33.90   $\pm$   1.96$^{d}$  & 25.06 $\pm$   2.09$^{e}$& \\
148688  u   &23.11  $\pm$   9.88    &   18.73   $\pm$   1.18    &   28.29   $\pm$   3.59$^{d}$  &0.39   $\pm$   0.04      & \\
149757  u   &40.98  $\pm$   6.00    &   25.44   $\pm$   0.82    &   29.32   $\pm$   1.96$^{d}$  &2.68   $\pm$   0.05      & 4.40$^{g}$\\
151932  u   &79.15  $\pm$   9.88    &   26.76   $\pm$   3.42    &   15.13   $\pm$   3.38        &2.43   $\pm$   0.07      &\\
152270  u   &56.54  $\pm$   12.81   &   17.79   $\pm$   2.61    &   25.10   $\pm$   1.14        &1.59   $\pm$   0.10      &\\
154368  u   &169.84 $\pm$   15.73   &   61.75   $\pm$   4.10    &   21.46   $\pm$   1.67        &26.44  $\pm$   2.07$^{e}$ &14.45$^{h}$\\
154811  u   &51.90  $\pm$   9.15    &   22.85   $\pm$   2.79    &   39.43   $\pm$   2.59$^{d}$  &0.17   $\pm$   0.04      &\\
163800  h/u &78.43  $\pm$   14.27   &   34.36   $\pm$   2.16    &   16.02   $\pm$   0.86        &2.96   $\pm$   0.08      &\\
164794  u   &32.26  $\pm$   11.89   &   11.86   $\pm$   2.47    &   10.32   $\pm$   0.72        &0.27   $\pm$   0.06      &\\
169454  u   &98.76  $\pm$   13.17   &   42.90   $\pm$   2.79    &   19.50   $\pm$   1.42        &40.22  $\pm$   2.38$^{e}$& \\
\hline
\end{tabular}}
\medskip
We designate data from the literature as follows: $^a$~--~Roueff (\cite{Roue96}); 
$^b$~--~Felenbok \& Roueff (\cite{Fele96}); $^c$~--~Boiss\'e et~al. (\cite{Bois05}).  To avoid saturation effects in the case of CH$^{+}$ and CN~molecules we used the unsaturated: $^d$~--~CH$^{+}$ A$-$X~(1,~0) line at 3957~\AA; $d^{\prime}$~--~CH$^{+}$ A$-$X~(2,~0) line at  3745~\AA; $^e$~--~CN B$-$X~(1,~0) band at 3579~\AA; $^f$~--~CN A$-$X~(1,~0) band at 9186~\AA. Data on H$_{2}$ taken from $^g$~--~Savage et~al. (\cite{Sava77}); $^h$~--~Rachford et~al. (\cite{Rach02}); $^c$~--~Boiss\'e et~al. (\cite{Bois05}).
\end{table}