\begin{table}%t3
%\centering
\par
\caption{\label{values}$^{13}$CO values for Boltzmann plots.}
\begin{tabular}{lrrrrrr}
\hline
\hline
\noalign{\smallskip}
& $E_{\rm{lower}}/k$ & $A$ & $f_{\rm ul}$ & $F$ & $g_J$ & $N_l(^{13}\rm{CO})$ \\
& K   & km~s$^{-1}$    & $\times 10^{-6}$&     &       & $\times 10^{15}$~cm$^{-2}$\\
\hline
\multicolumn{2}{l}{BN@-15~km~s$^{-1}$}\\
R(6) & 116 & 3.70 & 6.0 & 1.18 & 13 & 6.0 \\
R(7) & 155 & 3.16 & 5.9 & 1.14 & 15 & 5.0 \\ 
R(9) & 249 & 1.90 & 5.9 & 1.08 & 19 & 2.9 \\
R(10)& 304 & 1.36 & 5.8 & 1.06 & 21 & 2.0 \\
R(11)& 365 & 0.69 & 5.8 & 1.04 & 23 & 1.0 \\
R(12)& 432 & 0.51 & 5.8 & 1.02 & 25 & 0.7 \\
R(13)& 504 & 0.27 & 5.8 & 1.02 & 27 & 0.4 \\
\hline                          
\multicolumn{3}{l}{source n @-7~km~s$^{-1}$ comp.}\\
R(7) & 155 & 4.1  & 5.9 & 1.14 & 15 & 6.5 \\
R(9) & 249 & 2.7  & 5.9 & 1.08 & 19 & 4.1 \\
R(10)& 304 & 2.0  & 5.8 & 1.08 & 21 & 3.1 \\
R(12)& 432 & 1.3  & 5.8 & 1.06 & 25 & 2.0 \\
R(13)& 504 & 1.5  & 5.8 & 1.05 & 27 & 2.2 \\
\hline                          
\multicolumn{3}{l}{source n @+5~km~s$^{-1}$ comp.}\\
R(7) & 155 & 4.6  & 5.9 & 1.23 & 15 & 7.8 \\
R(9) & 249 & 2.7  & 5.9 & 1.16 & 19 & 4.4 \\
R(10)& 304 & 1.8  & 5.8 & 1.12 & 21 & 2.8 \\
R(12)& 432 & 0.6  & 5.8 & 1.04 & 25 & 0.9 \\
R(13)& 504 & 0.1  & 5.8 & 1.00 & 27 & 0.1  \\
\hline
\end{tabular}
\tablefoot{The table entries are explained in the main text.} 
\end{table}