\begin{table}%t5
\caption{Injection and saturation times for the grain mantles and the grain cores 
for a medium with an initial H$_2$ density of $n_0=10^5$~cm$^{-3}$.}\label{tab3}
\small %\begin{center}
{\begin{tabular}{ccccccccc|cccccccc}     % 17 columns 
\hline\hline       
 & \multicolumn{8}{c}{{ Mantles}} & \multicolumn{8}{c}{{ Cores}} \\
 %\hline\noalign{\smallskip}
 & \multicolumn{8}{c}{${v}_{\rm s}$ (km$~$s$^{-1}$)} &
 \multicolumn{8}{c}{${v}_{\rm s}$ (km$~$s$^{-1}$)} \\
& \multicolumn{2}{c}{10} & \multicolumn{2}{c}{20} &
 \multicolumn{2}{c}{30} & \multicolumn{2}{c}{40} 
& \multicolumn{2}{c}{10} & \multicolumn{2}{c}{20} &
 \multicolumn{2}{c}{30} & \multicolumn{2}{c}{40}  \\
\hline
& Inj. & Sat. & Inj. & Sat. & Inj. & Sat. & Inj. & Sat.
& Inj. & Sat. & Inj. & Sat. & Inj. & Sat. & Inj. & Sat. \\                  
   H$_2$ & $\ldots$ & $\ldots$ & 14.6 & 16.3 & 6.3 & 8.2 & 4.6  & 6.0 &
$\ldots$ & $\ldots$ & $\ldots$ & $\ldots$ & $\ldots$ & $\ldots$ &
     $\ldots$ & $\ldots$ \\
   He    & $\ldots$ & $\ldots$ & 7.4 & 10.1 & 4.4 & 6.3  & 3.4  & 5.0
   & $\ldots$ & $\ldots$ & $\ldots$ & $\ldots$ & $\ldots$ & $\ldots$ &
     $\ldots$ & $\ldots$ \\
   C     & $\ldots$ & $\ldots$ & 4.4  & 6.4 & 2.9 & 4.9  & 2.3  & 4.1
   & $\ldots$ & $\ldots$ & $\ldots$ & $\ldots$ & $\ldots$ & $\ldots$ &
     $\ldots$ & $\ldots$ \\
   O     & 9.8 & 14.4 & 3.7  & 6.0 & 2.5 & 4.7  & 2.1  & 3.9
   & $\ldots$ & $\ldots$ & $\ldots$ & $\ldots$ & $\ldots$ & $\ldots$ &
     9.2 & 10.4 \\
   Si    & 6.9  & 10.5  & 2.9  & 5.7  & 2.1 & 4.3  & 1.8  & 3.6
   & $\ldots$ & $\ldots$ & $\ldots$ & $\ldots$ & 10.5 & 11.9 &
     6.2  & 6.6 \\
   Fe    & 4.5     &  8.6    & 2.3  & 5.1  & 1.8 & 3.5  & 1.3  & 2.6
   & $\ldots$ & $\ldots$ & $\ldots$ & $\ldots$ & 5.9 &  6.5 &
     4.3 & 4.8 \\
   CO    & 6.5     &  10.5    & 2.9  & 5.7  & 2.1 & 4.3  & 1.8  & 3.6
   & $\ldots$ & $\ldots$ & $\ldots$ & $\ldots$ & 10.2 & 11.9 & 
     6.1 & 6.6  \\
  { all} & { 4.5} & { 10.5} & { 2.3}  & {5.7} & { 1.8} & { 4.4}  & {1.3}  & {4.6} & {$\ldots$} & { $\ldots$} & {$\ldots$} & {$\ldots$} & {5.9} & {11.9} &     { 4.3} & {6.6} \\
\hline                  
\end{tabular}}
\parbox{15cm}{
{\tiny Note}. The injection and saturation times are given in yr.}
%\end{center}
\par
\end{table}