\begin{table}%t8
%\centering
\par
\caption{Statistics of the spatial distribution of the various age groups 
in the sample. For each age group the total number of stars and the number per square
degree is given. The numbers are for a RASS count-rate limit of 0.03~cts~s$^{-1}$
except for area V which has a count-rate limit of 0.01~cts~s$^{-1}$.
\label{agelocation}} 
\begin{tabular}{lllllllll} 
\noalign{\smallskip}     
\hline 
\hline 
\noalign{\smallskip}    
area        & \multicolumn{8}{c}{Age group} \\ 
\noalign{\smallskip}    
\hline 
\noalign{\smallskip}    
       & \multicolumn{2}{c}{PMS} & \multicolumn{2}{c}{Pl\_ZAMS} &\multicolumn{2}{c}{UMa}  &  \multicolumn{2}{c}{Hya+} \\ 
       & \multicolumn{2}{c}{$<$$100$~Myr} & \multicolumn{2}{c}{100~Myr} & \multicolumn{2}{c}{$\sim$$300$~Myr} & \multicolumn{2}{c}{$>$$660$~Myr} \\ 
\noalign{\smallskip}    
\hline 
\noalign{\smallskip}    
I     & 8 & 0.056 & 14 & 0.097 &  3  & 0.021 & 10 & 0.069 \\  
II    & 2 & 0.014 & 9  & 0.063 &  1  & 0.007 & 22 & 0.153 \\ 
III   & 0 & 0     & 7  & 0.049 &  1  & 0.007 & 16 & 0.111 \\ 
IV    & 0 & 0     & 1  & 0.014 &  1  & 0.014 &  5 & 0.069 \\ 
V     & 0 & 0     & 3  & 0.084 &  6  & 0.161 & 11 & 0.296 \\ 
VI    & 0 & 0     & 6  & 0.042 &  7  & 0.049 & 10 & 0.069 \\ 
\hline 
\end{tabular}
\end{table}