\begin{table}%t1 %\centering \par \caption{Structure and physical conditions in the molecular disk in the Red Rectangle, derived from our simplified model fitting of the CO data (model~A). Other parameters assumed in our modeling are also~given.\label{tab1}} $$\begin{tabular}{l|c|l} \hline\hline & & \\ {\bf Free parameters} & {\bf Law} & {\bf Fitted values} \\ & & \\ \hline\hline & & \\ Disk outer radius & constant & 1.5 \times 10^{16} cm \\ & & (2\secp6 for D = 380 pc) \\ \hline & & \\ Disk thickness & constant & 5\times 10^{15} cm \\ & & \\ \hline & & \\ Temperature & T \propto 1/r^{\alpha_T} & T(10^{16}~cm) = 40 K \\ & & \alpha_T = 0.8 \\ \hline & & \\ Gas density & n \propto 1/r^{\alpha_n} & n(10^{16}~cm) = 6\times 10^6~cm^{-3} \\ & & \alpha_n = 1.1 \\ \hline & & \\ Tangential & V_t \propto 1/\sqrt{r} & V_t(10^{16}~cm) = 1 \kms \\ velocity & (Keplerian) & (M_* = 0.9 \ms) \\ \hline & & \\ Expansion & constant & V_e = 0.4 \kms \\ velocity & & \\ \hline\hline\hline \multicolumn{2}{l|}{} & \\ \multicolumn{2}{l|}{\bf Fixed parameters} & {\bf Assumed values} \\ \multicolumn{2}{l|}{} & \\ \hline\hline \multicolumn{2}{l|}{} & \\ \multicolumn{2}{l|}{Distance} & 380~pc \\ \multicolumn{2}{l|}{} & \\ \hline \multicolumn{2}{l|}{} & \\ \multicolumn{2}{l|}{Axis inclination } & 5^\circ \\ \multicolumn{2}{l|}{from the plane of the sky} & \\ \hline \multicolumn{2}{l|}{} & \\ \multicolumn{2}{l|}{Axis inclination} & 11^\circ \\ \multicolumn{2}{l|}{in the plane of the sky (PA)} & \\ \hline \multicolumn{2}{l|}{} & \\ \multicolumn{2}{l|}{CO relative abundance} & 2 \times 10^{-4} \\ \multicolumn{2}{l|}{} & \\ \hline\hline \end{tabular}$$ \end{table}