\begin{table}%ta2
%\centering
\par
\caption{\label{Table:2}Observation summary. }
 {
\par
 \begin{tabular}{clcccl}
\hline \hline\noalign{\smallskip}
Molecule & Transition & Freq. [{GHz}] & I [K~km~s$^{-1}$] & Noise [K] & Comments\\
\hline
o-H$_2^{16}$O & $1_{1,0}{-}1_{0,1}$ & 556.936 & 10.22 & 0.005 &   \\
o-H$_2^{16}$O & $5_{3,2}{-}4_{4,1}$ & 620.701 & 14.89 & 0.005 & maser \\
o-H$_2^{16}$O & $3_{1,2}{-}3_{0,3}$ & 1097.365 & 14.44 & 0.036 &   \\
o-H$_2^{16}$O & $3_{1,2}{-}2_{2,1}$ & 1153.127 & 22.60 & 0.062 &   \\
o-H$_2^{16}$O & $3_{0,3}{-}2_{1,2}$ & 1716.770 & 30.89 & 0.104 &   \\
o-H$_2^{16}$O & $5_{3,2}{-}5_{2,3}$ & 1867.749 & 3.45 & 0.118 & standing waves \\
o-H$_2^{16}$O & $3_{2,1}{-}3_{1,2}$ & 1162.912 & 13.70 & 0.062 &   \\
p-H$_2^{16}$O & $2_{1,1}{-}2_{0,2}$ & 752.033 & 13.71 & 0.015 &   \\
p-H$_2^{16}$O & $5_{2,4}{-}4_{3,1}$ & 970.315 & 19.34 & 0.026 & maser \\
p-H$_2^{16}$O & $2_{0,2}{-}1_{1,1}$ & 987.927 & 27.85 & 0.030 &   \\
p-H$_2^{16}$O & $1_{1,1}{-}0_{0,0}$ & 1113.343 & 25.10 & 0.028 &   \\
p-H$_2^{16}$O & $1_{1,1}{-}0_{0,0}$ $\nu_2$=1 & 1205.798 & 0.59 & 0.070 & 
tentative, see Fig.~1 \\
p-H$_2^{16}$O & $4_2{,2}{-}4_{1,3}$ & 1207.639 & 8.21 & 0.070 & maser \\
p-H$_2^{16}$O & $5_{3,3}{-}6_{0,6}$ & 1716.953 & 1.03 & 0.104 & standing waves \\
o-H$_2^{17}$O & $3_{1,2}{-}3_{0,3}$ & 1096.414 & 1.20 & 0.036 &   \\
p-H$_2^{17}$O & $1_{1,1}{-}0_{0,0}$ & 1107.167 & 1.50 & 0.036 &   \\
o-H$_2^{18}$O & $3_{1,2}{-}3_{0,3}$ & 1095.627 & 2.52 & 0.036 &   \\
p-H$_2^{18}$O & $1_{1,1}{-}0_{0,0}$ & 1101.699 & 3.57 & 0.028 &   \\
$^{12}$C$^{16}$O & $10{-}9$ & 1151.985 & 9.61 & 0.062 &   \\
$^{12}$C$^{16}$O  & 16--15 & 1841.35 &2.48 &0.03 & standing waves \\
$^{13}$C$^{16}$O & $9{-}18$ & 991.329 & 2.43 & 0.030 &   \\
$^{13}$C$^{16}$O & $10{-}9$ & 1101.350 & 2.75 & 0.028 &   \\
$^{28}$Si$^{16}$O & $14{-}13$ & 607.599 & 2.31 & 0.005 &   \\
$^{29}$Si$^{16}$O & $13{-}12$ & 557.179 & 0.89 & 0.005 &   \\
$^{29}$Si$^{16}$O & $26{-}25$ & 1112.833 & 0.74 & 0.028 & low S/N, see Fig.~2 \\
$^{30}$Si$^{16}$O & $26{-}25$ & 1099.708 & 0.39 & 0.028 & 
tentative, see Fig.~2 \\
HCN & $7{-}6$ & 620.304 & 2.65 & 0.005 &\\
HCN & $13{-}12$ & 1151.452 & 2.22 & 0.062 & tentative, see Fig.~2 \\
SO & $13_{14}{-}12_{13}$ & 560.178 & 0.20 & 0.005 &   \\
NH$_3$ & $1_0{-}0_1$ & 572.498 & 4.93 & 0.005 &   \\
U &   & 988.255 & 1.37 & 0.030 & or at 1003.215~MHz \\
\hline
\end{tabular}}
\vspace*{-1.5mm}
\tablefoot{First column gives the molecular name, second column the transition, third column the frequency of the line, fourth column the integrated intensity, fifth column the noise, and last columns some comments (if necessary). One line is still unidentified, and is indicated with a ``U'' in the first column.}
\vspace*{4mm}
\end{table}