\begin{table}%[ht]%t3
\par
%\centering
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 \caption{\label{col_data} Column densities of \coiso\ and \moloiso.}
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\begin{tabular}{cccccc}
\hline \hline
\noalign{\smallskip}
$T_{\rm k}$	&   $A_{3,2}/\gamma_{3,2}$ &   $N$(\coiso)		& $A_{21,01}/\gamma_{21,01}$  &  $N$(\moloiso) 	& {\underline{$N$(\coiso)}}  \\   
(K)                   	&  (\cmthree)	   		    &	(\cmtwo)			& (\cmthree)\tablefootmark{a}   			   &  (\cmtwo)\tablefootmark{b}   	& $N$(\moloiso)		   \\ 
\noalign{\smallskip}
\hline
\noalign{\smallskip}
300			&    $3.4 \times 10^{4}$	&$4.9 \times 10^{16}$	& $2.7 \times 10^{2}$	& $<$$5.6 \times 10^{15}$  & $>$$9$ \\
100			&    $4.0 \times 10^{4}$	&$2.0 \times 10^{16}$ 	& $4.7 \times 10^{2}$	& $<$$2.0 \times 10^{15}$  & $>$$10$ \\
\phantom{1}40	&    $1.7 \times 10^{5}$	&$1.2 \times 10^{16}$	& $7.4 \times 10^{2}$	& $<$$9.5 \times 10^{14}$  & $>$$14$ \\
\phantom{1}20	&    $1.7 \times 10^{5}$	&$1.4 \times 10^{16}$	& $1.0 \times 10^{3}$	& $<$$6.3 \times 10^{14}$  & $>$$22$ \\
\phantom{1}10	&    $1.7 \times 10^{5}$	&$3.2 \times 10^{16}$	& $1.5 \times 10^{3}$	& $<$$5.5 \times 10^{14}$  & $>$$59$ \\
% \noalign{\smallskip}
  \hline
  \end{tabular}
\tablefoot{
 \tablefoottext{a}{Collision rate coefficient $\gamma(T) = 4.9 \times 10^{-11}~~(T/300~{\rm K})^{0.5}~{\rm cm^3~s^{-1}}$.} \\
 \tablefoottext{b}{Limits on $N$(\moloiso) are $1 \sigma$; $f_{\rm b} = 1.0$ and \tadv~$< 3.3$~mK \kms.}}
\end{table}