\begin{table}%T3
\caption{\label{tab-attributes}Attributes used in each classification stage by the
sequential classifier. Abbreviations used are as follows: log-$ fi$
represents the logarithm of the $i$th frequency; log-$fi$-$fj$ is the
logarithm of the ratio $fi/fj$; afi represents the sum of squares of the
harmonic amplitudes in frequency~$i$; log-$afihj$-$t$ is the logarithm of
the total amplitude of the $j$th harmonic of the $i$th frequency;
log-$crfij$ is the logarithm of the $j$th ratio of harmonic amplitudes of
the $i$th frequency ($j=0$~corresponds to the ratio of the amplitude of
the second harmonic over that of the first, $j=1$, to the ratio of the
amplitude of the third harmonic over that of the first and so on);
log-$crfihj$-$fi'hj'$ represents the logarithm of the amplitude ratio
between harmonics $j$ and $j'$ of frequencies $i$ and $i'$ respectively; $pdfij$
is the $j$th phase difference between the various harmonics of the $i$th
frequency ($j=0$ corresponds to the first and second harmonics, $j=1$, to
the third and first harmonics, and so on); varrat represents
the variance ratio defined in Paper~I.}
\small
%\centering
\par
\begin{tabular}{cc}
  \hline
  \hline
  Stage  & Classes and attributes \\
  \hline
1 & Eclipsing/non eclipsing \\
 & log-$f3$, log-$f2$-$f1$, log-$af1h1$-$t$, log-$crf10$, log-$crf15$, log-$crf20$, log-$crf25,$ log-$crf32$, log-$crf33$, $pdf$12, $pdf$13, $pdf$14, $pdf$23 \\
2 & Cepheids/non Cepheids  \\
 &  log-$f1$, log-$f2$-$f1$, $af$1, $af2$, log-$af1h1$-$t$, log-$af1h2$-$t$, log-$crf3h1$-$f1h1$, log-$crf10$, log-$crf11$, log-$crf14$, $pdf12$,  varrat   \\
3 & Red giants/non red giants  \\
 &  log-$f1$, log-$f2$, log-$f3$, log-$f2$-$f1$, $af1$, $af2$, log-$af1h1$-$t$, log-$af2h3$-$t$, log-$crf21$, log-$crf24$, log-$crf30$ \\
4 & RR~Lyrae/Non RR~Lyrae \\ 
 & log-$f1$, $af1$, log-$af1h1$-$t$, log-$af3h1$-$t$, log-$crf3h1$-$f1h1$, log-$crf11$, log-$crf14$, $pdf$12, $pdf$13 \\ 
5 & CLCEP/DMCEP/PTCEP/RVTAU \\
 & log-$f1$, log-$af1h1$-$t$, log-$af2h3$-$t$, log-$af2h4$-$t$, log-$af3h4$-$t$, log-$crf12$, log-$crf32$, $pdf12$, varrat\\
6 & MIRA/SR \\
 &   $af1$, log-$af1h1$-$t$, log-$af1h3$-$t$, log-$af2h4$-$t$, log-$af3h3$-$t$, varrat\\
7 & RRAB/RRC/RRD\\ 
 & log-$f1$, log-$f2$-$f1$, $af1$, log-$af1h2$-$t$, log-$crf2h1$-$f1h1$, log-$crf10$, $pdf12$, varrat\\ 
8 & PVSG BE BCEP CP DSCUT ELL GDOR HAEBE HMXB LBOO LBV PTCEP ROAP SPB SXPHE TTAU WR FUORI PSDB \\
 &   log-$f1$, log-$af2h1$-$t$, log-$crf2h1$-$f1h1$, log-$crf10$, log-$crf13$ \\ 
\hline
\end{tabular}
\end{table}