\begin{table}%t1
 \caption{\label{tab:obs}Absolute {\em(upper panel)} and relative {\em(lower panel)}
     numbers of YSOs of different classes from observations (references see text).}
  %\centering
\par
\begin{tabular}{l r r r r r}
\hline
\hline
Region & Prestellar & 0 & 1 & 2 & 3 \\
\hline
$\rho$ Oph & 98 & 2 & 15 & 111 & 77 \\
Serpens    & 26 & 5 & 19 & 18 & $\sim$20 \\
Taurus     & 52 & 3 & 25 & 108 & 72 \\
Cha I      & $<$71 & 2 & 5 & \multicolumn{2}{c}{175} \\
IC 348     &    & 2 & 2  & \multicolumn{2}{c}{261} \\
NGC 7129   &    & 1 & 20 & 80  \\
IC 1396A   &    & 2 & 6 & 47 & 1 \\
\hline
$\rho$ Oph &  & 0.01 & 0.07 & \multicolumn{2}{c}{0.92} \\
Serpens    &  & 0.08 & 0.31 & \multicolumn{2}{c}{0.61} \\
Taurus     &  & 0.01 & 0.12 & \multicolumn{2}{c}{0.87} \\
Cha I      &  & 0.01 & 0.03 & \multicolumn{2}{c}{0.96} \\
IC 348     &  & 0.01 & 0.01 & \multicolumn{2}{c}{0.98} \\
NGC 7129   &  & 0.01 & 0.20 & \multicolumn{2}{c}{0.79} \\
IC 1396A   &  & 0.03 & 0.11 & \multicolumn{2}{c}{0.86} \\
\hline
\end{tabular}
 \end{table}