\begin{table}%t4
%\centering
\par
\caption {\label{scl}The scaling factors between the different beam size observations, which should be multiplied to the line intensity to estimate the one in a $80\arcsec$ beam.}
\begin{tabular}{lc}
\hline\hline
\noalign{\smallskip}
IRS1 &  \\
beam size ($\arcsec$) & scaling factor  \\
19.7 &  0.40    \\
42.0  & 0.57  \\
43.0  &  0.55 \\
55.0  & 0.70  \\
80.0  & 1.00  \\		  
\hline		
\end{tabular}
\end{table}