\begin{table}%t10 \caption{\label{tmodelprof}Parameters of the envelope model used to fit the radial intensity profile of the 1.2~mm continuum emission and the SED of MM1.} %\centerline {\begin{tabular}{lc} \hline\hline Parameter &Value\\ \hline Dust emissivity index $\beta$ &\phn1.5\phn\\ $T$ power-law index &\phn0.36$^{a}$\\ $T$ at $1000$~AU (K) &31\\ Density power-law index &\phn1.9\phn\\ Density at $1000$~AU (g~cm$^{-3}$) &$1.1 \times10^{-19}$\\ \hline $R_{{\rm env}}^{b}$ (AU) &$2.1 \times10^{4}$\\ Envelope mass$^{c}$ (\mo) &6.0\\ \hline \end{tabular}} \medskip $^a$~$2/(4+\beta)$. $^b$~Radius for which the envelope density falls to a particle ambient density $n$(\hh) of $7.3 \times 10^{3}$~\cmt. $^c$~Integrated up to $R_{{\rm env}}$. \end{table}