\begin{table}%t9
%\centering
\par
\caption{Mean proper motions and dispersions in area I for  stars  of age groups PMS, 
Pl\_ZAMS, UMa, and M stars without lithium detection (in  mas~yr$^{-1}$).
\label{pmarea1}} 
\begin{tabular}{lllll} 
\noalign{\smallskip}     
\hline 
\hline 
\noalign{\smallskip}    
age group    &  $\langle\mu_{\alpha}\cos\delta\rangle$ & $\sigma_{\alpha}$ &$ \langle\mu_{\delta}\rangle$ &
    $\sigma_{\delta}$\\
\noalign{\smallskip}    
\hline 
\noalign{\smallskip}    
PMS         & $+16$ & 15 & $-8$ & 14\\
Pl\_ZAMS    & $+18$ & 52 & $-22$ & 32\\
UMa & $+16$ & 15 & $-8$ & 14\\
Hya+ & $-33$ & 69 & $-42$ & 55\\
M stars     & $+59$ & 64 & $-67$ & 131\\
\hline 
\end{tabular}
\end{table}