\begin{table}%t5
\caption{\label{tab5}$^{13}$CO observations.}
%\centering
\small
\begin{tabular}{l ccccc}
\hline\hline\\
Name & $I_{\rm (1-0)}$ & $\sigma_{1-0}$   & $I_{\rm (2-1)}$ & $I\left(\frac{12}{13}\right)_{(1-0)}$ &   $I\left(\frac{12}{13}\right)_{(2-1)}$    \\
  & K~km~s$^{-1}$ & mK & K~km~s$^{-1}$ & & \\
\hline
%data are from sfetab3b.dat
 M33\_4 &  0.15 $\pm$ 0.02 & 5.6
 &31.2 mK &  12.2 &   -- \\
 M33\_7 &  0.14 $\pm$ 0.02 & 4.2
 &  0.16 $\pm$ 0.01 &  10.7 &   8.5 \\
 M33\_8 &  0.13 $\pm$ 0.02 & 3.3
 &  0.23 $\pm$ 0.02 &  11.2 &  10.0 \\
 M33\_9 &  0.16 $\pm$ 0.01 & 3.9
 &  0.23 $\pm$ 0.04 &  15.7 &  10.1 \\
M33\_10 &  0.29 $\pm$ 0.02 & 5.2
 &  0.22 $\pm$ 0.02 &  12.2 &  13.8 \\
M33\_11 &  0.77 $\pm$ 0.02 & 5.1
 &  1.09 $\pm$ 0.04 &  12.6 &   9.8 \\
M33\_12 &  1.78 $\pm$ 0.02 & 4.6
 &  1.21 $\pm$ 0.03 &  12.8 &  19.7 \\
M33\_18 &  0.07 $\pm$ 0.01 & 2.9
 &  0.11 $\pm$ 0.02 &   8.9 &  11.4 \\
  \hline
\end{tabular}
\end{table}