\begin{table}%t2
\caption{\label{table2}$^{12}$CO(1--0) flux values for \nnn.}
%\centering
 \small 
\begin{tabular}{llllll}
\hline \hline \noalign{\smallskip}
Reference & Telescope &	Diameter & Primary beam	or FOV\tablefootmark{a} & Beam & Flux \\
& & [m] &	[\arcsec] & [\arcsec $\times$ \arcsec] &	[Jy~km~s$^{-1}$] \\
\hline
\citet{iono05}	& OVRO     &    & 60 & $4.4 \times 3.6$ & 233	\\
\citet{zhu99}	& NRAO     & 12 & 55 &                  & 365	\\
\citet{young95}	& FCRAO	   & 14 & 45 &		        & 320	\\
This paper	& PdBI+30~m &	& 42 & $2.1 \times 1.4$	& 254	\\
This paper	& PdBI+30~m & 	& 22$^{{\rm b}}$ & $2.1 \times 1.4$	& 185	\\
This paper	& PdBI	   &	& 22$^{{\rm b}}$ & $2.0 \times  1.4$	& 150	\\
This paper	& 30~m	   & 30	& 22 (central position) & & 167$^{{\rm c}}$	\\
This paper	& 30~m	   & 30	& 22 (inner $50^{\prime\prime} \times 50^{\prime\prime}$) & &377$^{{\rm d}}$ \\
\hline
\end{tabular}
\tablefoot{\tablefoottext{a}{Primary beam is considered for single dish observations, while field-of-view (FOV) for interferometric or combined (interferometric+single dish) ones;} \tablefoottext{b}{the photometry has been performed within 22\arcsec, the $^{12}$CO(1--0) primary beam for the 30~m telescope;} \tablefoottext{c}{the $^{12}$CO(1--0) recovered flux for the central position (0\arcsec, 0\arcsec);} \tablefoottext{d}{the $^{12}$CO(1--0) recovered flux for inner $50^{\prime\prime} \times 50^{\prime\prime}$, $5 \times 5$ mapping with 7\arcsec\ spacing (see Sect.~\ref{sec:30m-obs}).}}
\end{table}