\begin{table}%t1
\caption{\label{tab:size}Apparent sizes derived from PdBI data.}
%\centering
\par
\begin{tabular}{ccc}
 \hline\hline\noalign{\smallskip}
 Observations & Flux & Gaussian $FWHM$ \\ \noalign{\smallskip}\hline\noalign{\smallskip}
  & (mJy)  & ($''$) \\
  3.4~mm & $4.2 \pm 0.2$ & $0.6 \pm 0.2$ \\
  1.3~mm & $47.3 \pm 0.7$ & $0.42 \pm 0.02$ \\ \noalign{\smallskip}\hline\noalign{\smallskip}
 & (Jy~km~s$^{-1}$) & ($''$) \\
   $^{12}$CO $J=2{-}1$ & $1.07 \pm 0.06$ & $0.87 \pm 0.06$ \\
 \hline
\end{tabular}
\end{table}