\begin{table}%t4
%\centering
\par
\caption{Ice abundances relative to water ice. \label{Vela:table_ice_abundances}}
\begin{tabular}[!ht]{lllll}
\hline
\hline
\noalign{\smallskip} 
\multicolumn{1}{c}{Source} &\multicolumn{1}{c}{$N_{{\rm ice}}$(H$_2$O)}&\multicolumn{1}{c}{$N_{{\rm ice}}$(OCN$^{-}$)/}&\multicolumn{1}{c}{$N_{{\rm ice}}$(CH$_3$OH)/}&\multicolumn{1}{c}{$N_{{\rm ice}}$(CO)/} \\
                           &\multicolumn{1}{c}{(10$^{18}$ cm$^{-2}$)}&\multicolumn{1}{c}{$N_{{\rm ice}}$(H$_2$O)}&\multicolumn{1}{c}{$N_{{\rm ice}}$(H$_2$O)}&\multicolumn{1}{c}{$N_{{\rm ice}}$(H$_2$O)}\\
&&\multicolumn{1}{c}{(\%)}&\multicolumn{1}{c}{(\%)}&\multicolumn{1}{c}{(\%)}\\
\noalign{\smallskip} 
\hline
\noalign{\smallskip} 
\object{LLN 8}   & 0.80 $\pm$ 0.15          & $<$0.2 & $<$12.5&   $<$22\\
\object{LLN 8b}  & 1.7\phantom{0} $\pm$ 0.4 & ... & ... & ... \\
\object{LLN 13}  & 2.2\phantom{0} $\pm$ 0.4 & $<$0.2& $<$4.5 & \phantom{$<$}55 \\
\object{LLN 13b} & 1.7\phantom{0} $\pm$ 0.4 & ... & ... & ... \\
\object{LLN 17}  & 3.61 $\pm$ 0.70          & \phantom{$<$}1.7 & \phantom{$<$}6.9 & \phantom{$<$}15\\
\object{LLN 17b} & 2.2\phantom{0} $\pm$ 0.2 & $<$1.1 & ... & \phantom{$<$}17 \\
\object{LLN 19}  & 1.05 $\pm$ 0.2           & $<$0.7 & $<$9.5 & \phantom{$<$}4\\
\object{LLN 41}  & 1.85 $\pm$ 0.4           & $<$0.1 & $<$5.4 & \phantom{$<$}22\\ 
\object{LLN 41b} & 1.2\phantom{0} $\pm$ 0.4 & $<$1.9 & ... & $<$15 \\
\hline
\end{tabular}
\end{table}