\begin{table}%t2
\caption{\label{tab3}The $^{12}$CO $J=$ 6--5 and $J=$ 7--6 integrated line intensities at offset positions.}
%\centering
\par
\begin{tabular}{c c c c c c}
 \hline\hline \noalign{\smallskip}
 & $^{12}$CO $J=$ 6--5 & & & $^{12}$CO $J=$ 7--6 & \\
RA offset & Dec offset & $I_{{\rm CO(6-5)}}$ & RA offset & Dec offset & $I_{{\rm CO(7-6)}}$ \\
($\arcsec$) & ($\arcsec$)  & (K~km~s$^{-1}$) & ($\arcsec$) & ($\arcsec$)  & (K~km~s$^{-1}$)\\
\hline 
--9.8  &  --17.0 & $0.4 \pm 0.2$ & +10.2 & --17.0 & ${<}2.0$ \\
+8.8  &  --18.0 & $0.5 \pm 0.2$ & +20.2 & --1.4 &  ${<}2.0$ \\
--18.9 &  --0.2  & ${<}0.2$ & --9.0 & --16.5 &  ${<}2.0$ \\
+19.4 &  --1.2  & ${<}0.2$ & +11.0 & +16.2 &  ${<}2.0$ \\
--9.3  &  +16.6 & ${<}0.2$ & --18.8 & +0.2 &  ${<}2.0$ \\
+10.0 &  +16.6 & ${<}0.2$ & --9.1 & +16.9 &  ${<}2.0$ \\
\hline
\end{tabular}
\tablefoot {The line intensities $I = \int{T_{\rm MB}~{\rm d}V}$ are integrated over a velocity range 0$-$10~km~s$^{-1}$. The upper limits are given by the 2$\sigma$~value.}
\vspace*{4mm}
\end{table}