\begin{table}%t1
\par
 \caption{\label{tab}Model parameters.}
%\centering
\par
\begin{tabular}{c | c | c }
\hline\hline
 Parameter & $R<400$~AU & $400\leq R\leq800$~AU \\
\hline
 Surface density & 
   $\Sigma \propto R^{-1}$, see \citet{pinte} & 
   $\Sigma_{400}~(R/400~{\rm AU})^{-p}$ 
   with $\Sigma_{400}\leq0.9$~g~cm$^{-2}$, $p\geq 0$ \\
 Gas-to-dust mass ratio & 100 & 100 \\
 Gas temperature structure & 
   $f~T_{\rm dust}$ with $1 \leq f \leq 2$ & 
   $T_{400}~(R/400~{\rm AU})^{-q}$, $T_{400}=30$~K, $q=0.5$ \\
 Vertical structure  & 
   see \citet{pinte} & 
   $T(z)={\rm const.}$, $\rho({z})={\rm const.}$, $z_{\rm max}=100$~AU \\
 ${\rm [CO]/[H_2] }$ & $10^{-4}$ & $10^{-4}$ \\
 ${\rm [^{12}CO]/[^{13}CO]}$ & 77 & 77 \\
 $M_\star$ & 1.2 $M_\odot$ & 1.2 $M_\odot$ \\
 Inclination & 50$\degr$ & 50$\degr$ \\
 FWHM microtubulence & 0.16 km~s$^{-1}$ & 0.16 km~s$^{-1}$ \\
\hline
\end{tabular} 
\end{table}