\begin{table}%t1
\caption{Properties of the sample of XEST variable sources analyzed in this
paper. Stellar parameters are taken from \citet{Guedel06}. In the last
column we give a~classification of the observed variability.} 
\label{tab_sample}
%\centering
\small
\begin{tabular}{llllll} 
\hline\hline
XEST ID      & Optical ID  & Sp. T.& TTS class.& $R_\star/R_\odot$& 
Variab. type\\
\hline
04-016       & V830 Tau    & K7     & WTTS     & 1.79  & slow decay      \\
09-026       & HQ Tau AB   & \ldots & WTTS     & \ldots& slow decay      \\
11-057       & FS Tau AC   & M0+M3.5& CTTS+CTTS& 0.93  & slow decay      \\
12-040       & DN Tau      & M0     & CTTS     & 2.25  & slow modulation \\
15-040       & DH Tau AB   & M1     & CTTS     & 1.82  & slow decay      \\
17-066       & JH 108      & M1     & WTTS     & 1.32  & atypical flare  \\
21-039       & HD 283572   & G5     & WTTS     & 2.56  & slow modulation \\
22-047       & XZ Tau AB   & M2+M3.5& CTTS+CTTS& 1.18  & slow rise       \\
22-089       & L1551 51    & K7     & WTTS     & 1.39  & slow decay      \\
23-032/24-028& V410 Tau ABC& K4     & WTTS     & 2.31  & atypical flare  \\
23-047/24-040& V892 Tau    & B9     & Herbig Ae& 2.66  & atypical flare  \\
23-050/24-042& V410 X7     & M0.75  & WTTS     & 1.69  & flares\\
23-056/24-047& Hubble 4    & K7     & WTTS     & 3.33  & complex variab. \\
23-074/24-061& V819 Tau AB & K7     & WTTS     & 1.93  & flare \\
26-072       & HBC 427     & K7     & WTTS     & 1.85  & flare \\
28-100       & BP Tau      & K7     & CTTS     & 1.97  & flare \\
\hline
05-031       & HD 283810   & K5V    &          &       & flare \\
16-031       & 2M J04195676+2714488& \ldots &  &       & flares\\
22-024       & HD 285845   & G6     &          &       & complex variab. \\
\hline
\end{tabular}
\end{table}