\begin{table}%t2=>%t3
%\centering
\par
\caption{YSO evolutionary stages as defined by \citet{robitaille2006}.}\label{table:stages}
\small \begin{tabular}{l l r r}
    \hline     \hline\noalign{\smallskip}
    Stage   & Components                & $M_{\rm disk}/M_\star$    & $\dot{M}_{\rm env}/M_\star$ \\
    \hline\noalign{\smallskip}
    I    & accreting envelope        & any                       & $>$$10^{-6} \ {\rm yr}^{-1}$ \\
    II      & disk, remains of envelope & $>$$ 10^{-6}$       & $<$$ 10^{-6} \ {\rm yr}^{-1}$ \\
    III     & optically thin disk       & $< $$10^{-6}$       & $<$$ 10^{-6} \ {\rm yr}^{-1}$\\
    \hline
\end{tabular}
\end{table}