\begin{table}%t8
\caption{Molecular parameters derived for the J-type shock with magnetic precursor model.}\label{tab:fitparam}
%\centering
\small
\begin{tabular}{cccc}
\hline \hline
% & & & & \\[-8pt]
Species             & $N$                & $\theta$	&   $\langle x \rangle$           \\
                    & (cm$^{-2}$)      &  (arcsec)	& 	        \\
\hline 
% & & & & \\[-8pt]
H$_2$               &7.4 $\times$ 10$^{20}$     &       --        &    --          \\
CO                  &1.2 $\times$ 10$^{17}$     &       60       &  1.6 $\times$  10$^{-4}$  \\
H$_2$O              &5.4 $\times$ 10$^{16}$     &       30       &  7.3 $\times$ 10$^{-5}$\\
OH                  &1.3 $\times$ 10$^{14}$     &       --        &  1.8 $\times$ 10$^{-7}$ \\
\hline 
\end{tabular}
\end{table}