\begin{table}%t4
\caption{Temperature and column density of the detected molecules.
\label{tcol}}
%\centering
\par
\begin{tabular}{ c r  c c}
\hline\hline
Molecules &  & \multicolumn{2}{c}{Source size} \\
	         & & 7\arcsec & 12\arcsec \\
\hline
HCOOCH$_3$ &     $T$ (K)              &176  $\pm$ 24 & 199 $\pm$ 28 \\
$\upsilon_{\rm t}=0$                &    $N$ (cm$^{-2}$)  & $17.0^{+1.8}_{-1.6}\times 10^{16}$ & $9.6^{+0.9}_{-0.9}\times 10^{16}$  \\
HCOOCH$_3$	&   T (K)              & 104 $\pm$ 14 & 131 $\pm$ 20\\
$\upsilon_{\rm t}=1$                &   $N$ (cm$^{-2}$)  & $9.4^{+4.0}_{-2.8}\times10^{16}$ &  $3.4^{+1.5}_{-1.1}\times 10^{16}$\\
HCOOCH$_3$  & $T$ (K)  &    144 $\pm$ 7   & 154 $\pm$ 8  \\
$\upsilon_{\rm t}=0 + \upsilon_t=1$      &  $N$ (cm$^{-2}$) & $11.4^{+0.9}_{-0.8}\times 10^{16}$ & $5.6^{+4.0}_{-3.7}\times 10^{16}$ \\                              
CH$_3$CH$_2$CN  & $T$ (K)              &  103 $\pm$ 9   & 114 $\pm$ 11  \\
	                      &  $N$ (cm$^{-2}$) & $3.7^{+0.6}_{-0.5}\times 10^{15}$ &$1.7^{+0.3}_{-0.2}\times 10^{15}$ \\
\hline                                
\end{tabular} 
\end{table}