\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}