\begin{table}%t2
\caption{Description of the values of different $flags$ for the complete sample of 1079 C-stars. }
\label{tab:table_flags}
%\centering
\par
\begin{tabular}{lllll}
\hline \hline
\multicolumn {3} {c} {Data quality} & BLUE & RED \\
\hline
$flag(1)$ & 0 & excellent              & 306 & 803 \\
          & 1 & good                   & 478 & 70 \\
          & 2 & fair                   & 136 & 20 \\
          & 3 & noisy or few data      & 115 & 150 \\
          & 4 & no data                & 44  & 36 \\
\hline
\multicolumn {3} {c} {Fit quality}     & BLUE & RED \\
\hline
$flag(2)$ & 0 & excellent                  & 124 & 101 \\
          & 1 & good                       & 191 & 258 \\
          & 2 & fair                       & 470 & 349 \\
          & 3 & bad                        & 127 & 168 \\
          & 4 & underivable                & 123 & 167  \\
          & 5 & underivable: $flag(1)=4$   & 44  & 36  \\
\hline
\multicolumn {3} {c} {Detected periodicity} & BLUE & RED \\
\hline
$flag(3)$ & 0 & no periodicity             & 143 & 135 \\
          & 1 & 1 period                   & 558 & 608 \\
          & 2 & 2 periods                  & 311 & 292 \\
          & 3 & one period                 & 67  & 44  \\
          &   & second period uncertain    &     &     \\
\hline 
\end{tabular}
\end{table}