\begin{table}%t3 \caption{\label{m_estim}Initial mass estimate (in solar units) from evolutionary diagrams. The second and third column give estimates based respectively on the $X$(H$)-L$ and HR~diagram. The errors take into account uncertainties on \teff\ and \lL. Tracks with $Z = 0.2~Z_{\odot}$ from \citet{mm05} are used.} \small%\centering \par \begin{tabular}{clr} \hline\hline Star & $X$(H$)-L$ & \teff \ -- $L$ \\ \hline \noalign{\smallskip} 1 & $\rm 34.4^{+10.1}_{-7.8}$ & $>$40 \\ \noalign{\smallskip} 2 & $\rm 22.8^{+5.4}_{-5.8}$ & $\rm 47.3^{+7.0}_{-10.6}$ \\ & & \\ 4 & $\rm 42.2^{+6.9}_{-7.8}$ & $\rm 64.7^{+16.0}_{-10.1}$ \\ \hline \end{tabular} \end{table}