\begin{table}%t2
\caption{\label{input}Source parameters: distance from the core center, H$_2$~density, \ndhpb abundance and \nddp/\ndhp~ratio. The position is measured away from the PSC~center along the RA~axis \citep[from][]{Pagani07}.} 
%\centering
\small
\begin{tabular}{ccccl}
\hline \hline
\multicolumn{2}{c}{Position}                      &  H$_2$ density           &   \ndhpb abundance   & \nddp/\ndhp \\
\cline{1-2}
 (AU)  & (arcsec)                          &  (cm$^{-3}$)    &                           &   \\
\hline
&&&& \\[-8pt]
  0	&0& 2.09 $\times$ 10$^6$	&	 2.40E$-$11	&	 0.69 $\pm$ 0.15\\
 1310	&12& 9.23 $\times$ 10$^5$  	&	 8.50E$-$11 	&	0.42 $\pm$ 0.05\\
 2620	&24& 5.33 $\times$ 10$^5$	&	 1.10E$-$10 &	0.25 $\pm$ 0.02\\
 3930	&36& 3.22 $\times$ 10$^5$	&	 1.53E$-$10 &	0.16 $\pm$ 0.03\\
 5240	&48& 1.86 $\times$ 10$^5$	&	 1.27E$-$10 &	0.06 $\pm$ 0.02\\
 6550	&60& 7.08 $\times$ 10$^4$	&	 1.00E$-$10	&	 $\le$0.03\\
\hline
\end{tabular}
\end{table}