\begin{table}%t3 \caption{\label{tab3}Number of variable objects found in the ONC ($\sim$1~Myr) by this study and in NGC~2264 ($\sim$2~Myr) by~L2004.} \par \small%\centerline { \begin{tabular}{c|ccc|c} \hline\hline VarFlag$^a$&\multicolumn{3}{c|}{ONC ($\sim$1 Myr)} & NGC 2264 ($\sim$2 Myr)\\ %\hline & $R< R_{\rm cluster}$ & $R > R_{\rm cluster}$ & Total & Total\\ \hline PV & 196 & 291 & 487 & 405\\ IV & 335 & 473 & 808 & 184\\ All stars& 847 & 2061 & 2908 & 10554\\ \hline \end{tabular}} \medskip $^a$ As in Table~\ref{tab1}, PV are periodic variables and IV~irregular variables. All stars include the total number of monitored stars independently of whether they are variables or~not. \end{table}