\begin{table}%t4
\caption{\label{param_IKTau}Parameters of the models with best goodness-of-fit for \object{IK~Tau}.}
%\centering
\par
\begin{tabular}{lcccc}
\hline \hline \noalign{\smallskip}
& Model 1 & Model 2 & Model 3 & 95\% confidence\\
 based on & \multicolumn{1}{c}{CO} & \multicolumn{1}{c}{CO \& HCN} & \multicolumn{1}{c}{CO \& HCN} & interval for\\
$v(r)$ & momentum eq. & momentum eq. & power-law $\beta~=~1$ & model 3\\
parameter & value & value & value & \\
\hline
\Teff [K] & 2200 & 2200 & 2200 & 100  \\
$R_{\star}$ [$10^{13}$~cm] & 2.5 & 1.5 & 1.5 & 1.0 \\
$[$CO/H$_2]$ [$10^{-4}$]    & \emph{2} & \emph{2} & \emph{2}& $-$  \\
distance  [pc] & 250 & 265 & 265 & 20 \\
$R_{\rm{inner}}$ [\Rstar] & 2.2 & 8.7 & 8.7 & 2 \\
$R_{\rm{outer}}$ [\Rstar] & 15~170 & 27~000 & 27~000 & $-$ \\
$v_{\infty}$     [km~s$^{-1}$] & \emph{17.7} & \emph{17.7}& \emph{17.7} & $-$ \\
\Mdot$(r)$ [{\Msun}/yr] & $8 \times 10^{-6}$ & $9 \times 10^{-6}$& $8 \times 10^{-6}$& $1 \times 10^{-6}$\\
$^{12}$C/$^{13}$C & 20 & 16 &  14 &  2 \\
\hline
\end{tabular}
\tablefoot {Details for each model are given in the text.  The numbers in italics are input parameters that have been kept fixed at the given value.}
\vspace*{5mm}
\end{table}