\begin{table}%t1
%\centering
\par
\caption{Overview of the observations of IRAS~2A, 4A, and 4B.}
\tiny \begin{tabular}{l r r r l r l}
\hline \hline \noalign{\smallskip}
Mol. & Trans.& $E_{\rm u}/k_{{\rm B}}$ & Frequency & Tel./Inst. & Beam  &  Ref. \\ 
 &  & (K) & (GHz)  & & size ($\arcsec$) & \\ 
\hline
CO & 2--1   & 16.6    & 230.538   & JCMT      & 22  & 1\\
& 4--3   & 55.3    & 461.041   & JCMT      & 11   & 2\\
& 6--5   & 116.2  & 691.473   & APEX      & 9     & 3\\
&10--9 & 304.2  & 1151.985 & HIFI-5a  & 20   & 4\\
 \element[][13]{C}O & 10--9 & 290.8  & 1101.349 & HIFI-4b  & 21   & 4\\
 C\element[][18]{O} & 1--0   &  5.3     & 109.782   & Onsala   & 34   & 1\\
& 2--1   & 15.8    & 219.560   & JCMT      & 23   & 1\\
& 3--2   & 31.6    & 329.331   & JCMT      & 15   & 1\\
& 5--4   & 79.0    & 548.831   & HIFI-1a  & 42   & 4\\
& 6--5   & 110.6  & 658.553   & APEX      & 10   & 3\\
& 9--8   & 237.0  & 987.560   & HIFI-4a  & 23   & 4\\
&10--9  & 289.7  &1097.162  & HIFI-4b  & 21   & 4\\
\hline
\end{tabular}
\tablefoot{\label{tbl:overviewobs}\tablefoottext{1}{\citet{Jorgensen02};}
\tablefoottext{2}{JCMT archive;}
\tablefoottext{3}{Y{\i}ld{\i}z et~al. (in~prep.);}
\tablefoottext{4}{this work.}}
\vspace*{-4.5mm}
\end{table}