\begin{table}%t2
\caption{List of  disk and stellar
parameters using the $\chi^2$ minimization in the UV plane.}
%as determined by the $\chi^2$-fitting}
\label{initial_params}
\small
%\centerline
{\begin{tabular}{l l l}
\hline\hline  %----------------------------------------------------------------------------------------------------
& \multicolumn{2}{l}{disk parameters derived from}  \\
& $^{13}$CO (Paper II) &    HCO$^+$  (this paper) \\
\hline\noalign{\smallskip}
$V_{\rm LSR}$      (km~s$^{-1}$)    &   5.87 & 5.87 $\pm$ 0.03 \\
Inclination ($^\circ$) & 35 & 21 $\pm$ 16 \\
$V$ sin($i$) (km~s$^{-1}$) & 1.67 & 1.49 $\pm$ 0.07 \\
Velocity exponent & 0.40 &  0.40 $\pm 0.04$ \\
Position angle ($^\circ$) & --30 &   --20 $\pm$ 4\\
Inner radius  (AU) & 75 & 110 $\pm$ 16 \\
Outer radius  (AU) & 1000 & $>$800 \\
Temperature (K) & 35 & [35] \\
~~~exponent $q$   & 0.1 &  [0.1]   \\
Column density (cm$^{-2}$) &  6.2 $\times$ $10^{22}$  & 6.2 $\pm$ $1.2\times 10^{12}$\\
~~~exponent & 2.5 & 3.5 $\pm$ 0.5\\
Line width      (km~s$^{-1}$)    & 0.40 & 0.23 $\pm$ 0.10 \\
 \hline
\end{tabular}}
\smallskip
The fixed parameters are taken from Table I of Paper II, as an average of
the results from the $^{13}$CO.  The column density is for H$_2$ (Col.\ 2) and HCO$^+$ (Col.\ 3) at 250 AU.
\end{table}