\begin{table}%t4
\caption{\label{table:molecules}Table of the contributions to the oxygen column-density.}   
%%\centering
\par
\par
\begin{tabular}{lllll}
\hline\hline\noalign{\smallskip}
Phase               & Constituent & $N_{\rm O}~(10^{22}$ m$^{-2})$ & \% of $N_{\rm O}^{p}$\tablefootmark{a}& \% of $N_{\rm O}$\tablefootmark{b}\\
\hline
\multirow{3}{*}{Gas}       & \ion{O}{i}                             & $2.7 \pm 0.1 $  & $94 \pm 4 $    &   \\
                           & \ion{O}{ii}, \ion{O}{iii}, \ion{O}{iv} & $0.10 \pm 0.05$ & $4 \pm 2 $     & $90 \pm 6 $\\
                           & \ion{O}{vii}, \ion{O}{viii}            & $0.05 \pm 0.01$ & $2.0 \pm 0.5 $ & \\
\hline
\multirow{2}{*}{Dust}      & Silicates                              & $0.25 \pm 0.05$ & 85--100  & \multirow{2}{*}{$10\pm 2$} \\
                           & Aluminates                             & $<$0.04        & 0--15    &    \\
\hline
\multirow{2}{*}{Molecules} & H$_2$O ice                             & $<$0.07        & $\sim$65 & \multirow{2}{*}{0--2}  \\
                           & CO                                     & $<$0.04        & $\sim$35 &                         \\
\hline
\end{tabular}
\tablefoot{\tablefoottext{a}{\% of $N_{\rm O}^{p}$ represents the contribution of each constituent to the respective phase.}
\tablefoottext{b}{\% of $N_{\rm O}$ give the contribution of the different phases to the total oxygen column density. See also Sect.~\ref{sec:dust_analysis} and Fig.~\ref{fig:oxygen_transmission} for the transmission of the main compounds.}}
\vspace*{-3mm}\end{table}