\begin{table}%[hbtp]%T10
    \caption{Models with \soo\ abundance "jumps''.}
    \label{tab:jump}
    %\begin{center}
{
    \begin{tabular}{lrr}
\hline \hline
\noalign{\smallskip}
Source     & (\soo/\hh)$_{\rm out}$ & (\soo/\hh)$_{\rm in}$ \\
           & $10^{-9}$              & $10^{-7}$  \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
W3 IRS5      &   10                   & 10 \\
MonR2 IRS3   &    1                   & 12$^b$ \\
AFGL 2136    &   0.5                  &  0.8$^b$ \\
W33A         &    1                   &  1 \\
AFGL 2591    &    2                   &  2 \\
NGC 7538 IRS1&    1                   &  14$^b$ \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
IRAS 16293$^a$ &    0.5                 &  1 \\
\hline
    \end{tabular}}
\parbox{6cm}{
$^a$ From \citet{fred02}.\\
$^b$ Estimated value.}
%\end{center}
\par
\end{table}