\begin{table}%[hbtp]%T7
    \caption{Column densities (\scm) in 15--20$''$ beams.}
    \label{tab:cold}
    %\begin{center}
{
    \begin{tabular}[lrrrrrrrr]{lrrrrrrrr}
\hline \hline
\noalign{\smallskip}
Source & \multicolumn{2}{c}{SO ($10^{13}$)} & \soo   & OCS & \hhs & \hhcs  & NS & HCS$^+$  \\
       & \multicolumn{2}{c}{\hrulefill} & & & & & & \\
       &Narrow & Broad       &$10^{13}$&$10^{13}$&$10^{13}$&$10^{12}$&$10^{12}$&$10^{11}$ \\
\noalign{\smallskip}
\hline   
\noalign{\smallskip}
NGC 7538 IRS9 &  3 &    4 &...    &0.6   &  2 &  6 & 1  &  5 \\
S140 IRS1     & 10 & $>$6 &  7    &$<$0.8&  3 &  7 & 1  &  6 \\
W3 IRS5     &$>$27 &$>$11 &530$^a$& 2    &  7 &  5 & ...&  3 \\ 
MonR2 IRS3    &  5 & $>$5 & 15    &...   &  3 &  4 &$<$3& ...\\
AFGL 2136     &  2 &    1 & $>$3  &...   &  2 &  4 &$<$2&  3 \\
W33A          &  4 &    9 & 26    & 9    &  4 & 10 & 4  &  6 \\
AFGL 2591     & 10 & $>$7 & 52$^b$& 1    &  3 &  6 & 2  &  5 \\
NGC 7538 IRS1 & 12 &    9 & 11    & 2    &  5 & 15 & 2  & 11 \\
NGC 6334 IRS1 & 40 &  ... & 46    &24    & 60 & 30 & 20 & 84 \\
\hline
    \end{tabular}}
\parbox{11.5cm}{
$^a$ Better fit with two components: $N=1.0$ and $2.0 \times 10^{15}$~\scm.\\
$^b$ Better fit with two components: $N=1.6$ and $5.5 \times 10^{14}$~\scm.}
%\end{center}
\par
\end{table}