\begin{table}%t2
\caption{\label{log_obs}Summary of the observations.}
%\centerline
{\begin{tabular}{lcccccccccccccccccc}
  \hline
  \hline\noalign{\smallskip}
  Star      &  $t_{\rm exp}$ & Airmass   	& Optical  & Standard  & Airmass   & Optical   & Asteroid  & Airmass   & Optical  \\
            &  (s)      &           	& seeing    &  star     &           & seeing    &           &           & seeing     \\
            &           &           & ($''$)      &           &           &  ($''$)     &           &           &  ($''$)    \\
  \hline
HD~142527   & 3600      & 1.10--1.28 & 0.71--1.08 & HD~211416 & 1.23--1.25 & 0.79--1.02 & HEBE      & 1.19--1.20 & 0.97--1.06 \\
HD~169142   & 3600      & 1.17--1.50 & 0.71--1.01 & HD~211416 & 1.23--1.25 & 0.79--1.02 & HEBE      & 1.19--1.20 & 0.97--1.06 \\
HD~150193A  & 3600      & 1.31--1.88 & 0.85--1.40 & HD~211416 & 1.24--1.25 & 0.81--0.99 & PSYCHE    & 1.13--1.16 & 0.75--0.83 \\
HD~163296   & 3600      & 1.60--2.70 & 0.79--1.19 & HD~211416 & 1.24--1.25 & 0.81--0.99 & IRIS      & 1.00--1.01 & 0.99--1.28 \\
HD~100546   & 3600      & 1.44--1.52 & 0.73--1.09 & HD~89388  & 1.31--1.32 & 0.61--0.73 & HEBE      & 1.19--1.20 & 0.97--1.06 \\
  \hline
\end{tabular}
} 
\tablefoot{The airmass and seeing intervals are given from the beginning to the
  end of the observations.}
\end{table}