\begin{table}%T8
%\centering
\par
    \caption{Power law model $n=n_0(r/r_0)^{-\alpha}$ for the density structure of MonR2 IRS3.}
    \label{tab:monr2}
    \begin{tabular}{lc}
\par
\hline \hline
\noalign{\smallskip}
Parameter & Value \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
\par
Outer radius $r_0$ & 0.3 pc \\
Inner radius & 0.001 pc \\
$\alpha$     & 1.25 \\
$n_0$ (\hh)  & $1.21\times 10^4$ \ccm \\
CO/\hh\      & $8\times 10^{-5}$ \\
Dust mass    & 1.05 \msol \\
\hline
    \end{tabular}
\end{table}