\begin{table}%t1
\caption{\label{models}Adopted model parameters.}
\par
\begin{tabular}{cccc}
\hline
\hline
Model~& $G_0$ & $F_{\rm FUV}$ & $n_{\rm H}$ \\
      &       & [$\rm erg\ cm^{-2} \ s^{-1}$] & [$\rm cm^{-3}$]  \\
\hline
1     & $10^3$ & 1.6 & $10^3$ \\
2     & $10^5$ & 160 & $10^3$ \\
3     & $10^3$ & 1.6 & $10^{5.5}$ \\
4     & $10^5$ & 160 & $10^{5.5}$ \\
\hline
$\delta v_{\rm d}$ (km s$^{-1}$)& $2.7$ & &\\
$\delta_{\rm d}$                & $1.0$ & &\\
\hline
\end{tabular}
\end{table}