\begin{table}%t2
\caption{\label{tab2}Relative photometry data.}
%\centering
\par
\begin{tabular}{llll}
\hline\hline\noalign{\smallskip}
HJD     &  Relative$ $Flux & Uncertainty & Flag\\
\hline
2~454~933.44031 & 0.99172 & 0.0037 & $OLT-I $ \\
2~454~933.44091 & 0.99204 & 0.0038 & $OLT-I $ \\
2~454~933.44221 & 1.00514 & 0.0039 & $OLT-I$ \\
2~454~933.44281 & 1.00314 & 0.0038 & $OLT-I $\\
2~454~933.44341 & 0.99458 & 0.0035 & $OLT-I $  \\
2~454~933.44401 & 0.99745 & 0.0037 &$ OLT-I $ \\
\hline
\end{tabular}
\tablefoot{Relative photometry vs. time; note that the complete table is available only electronically at the CDS. The time stamps refer to the Heliocentric Julian Date (HJD) at the middle of each exposure. The ``Flag'' column refers to the telescope and filter.}
\end{table}