\begin{table}%t5
%\begin{center}
\par
\caption{Overview of the most important model parameter. All abundances are given w.r.t. total H abundance.}\label{phys1}
\begin{tabular}{lll}
\hline\hline
&\multicolumn{2}{c}{Model Parameters}\\
\hline
$A_{\rm He}$&0.1&Elemental He abundance\\
$A_{\rm O}$&$3\times 10^{-4}$&Elemental O abundance\\
$A_{\rm C}$&$1\times 10^{-4}$&Elemental C abundance\\
$\zeta_{\rm CR}$&$5\times 10^{-17}$~s$^{-1}$&CR ionization rate\\
$A_{\rm V}$&$6.289\times 10^{-22} N_{\rm H_{total}}$&Visual extinction\\
$\tau_{\rm UV}$&$3.02 A_v$&FUV dust attenuation\\
$v_{\rm b}$ & 1~km~s$^{-1}$&Doppler width\\
$D_{\rm H_2}$&$5\times 10^{-18}\cdot \frac{\chi}{10}$~s$^{-1}$&H$_2$ dissociation rate\\[1.5mm]
$R$&$3\times 10^{-18} T^{1/2}$~cm$^{3}$~s$^{-1}$&H$_2$ formation rate\\[1.5mm]
$T_{\rm gas,fix}$&50~K&Gas temperature (for F1--F4)\\
$T_{\rm dust,fix}$&20~K&Dust temperature (for F1--F4)\\
$n$&$10^3, 10^{5.5}$~cm$^{-3}$&Total density\\
$\chi$&$10,10^5$&FUV intensity w.r.t.\\
& & \cite{draine78} field\\
& & (i.e. $\chi=1.71~G_0$)\\
\hline\\
\end{tabular}
%\end{center}
\par
\end{table}