\begin{table}%T4
%\centering
\par
 \caption{The effect of prewhitening frequencies in the SAT $b$ light curve, 
   with comparison to the $B$ light curves by EB86. The statistical uncertainty 
   in the errors ($\sigma$) is 10\% as derived from observations.
 \label{tab-prewqual}
  }
 \begin{tabular}{@{~~}l@{~~~}c@{~~~}c@{~~~}c@{~~~~}c@{~~~}c@{~~~}c@{~~}}
   \hline \hline
   \noalign{\smallskip}
          & \multicolumn{3}{c}{Before prewhitening} & \multicolumn{3}{c}{After prewhitening} \\
          & Min. I & Min. II & out of ecl. & Min. I & Min. II & out of ecl. \\
    \hline
    EB86  &          &        &        &       &              &               \\
    $\sigma$ (mmag)& 8.3 & 0.7& 10.1&5.5 & 5.1 & 6.5  \\
    ~\# obs ($B$)  & 77      & 24     & 190    & 77    & 24     & 190           \\ 
    \noalign{\smallskip}
    SAT            &         &      &        &      &       &     \\
    $\sigma$ (mmag)& 7.2 & 8.5 & 7.1& 5.9 & 6.4 & 5.5  \\
    ~\# obs ($b$)  & 114          & 402          & 152     & 114   & 402          & 152           \\
    \hline
    \end{tabular}
\end{table}