\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}