\begin{table}%T1
\caption{\label{OGLE-extractor}Published catalogues used in comparison with the
outcome of our classifiers.}
\small
%\centering
\par
\begin{tabular}{cccc}
  \hline
  \hline
  Variability class  & Source object & Reference  & Number of objects \\
  \hline
RR~Lyrae & LMC & \citet{Soszynski:2003} & 5455 (RRab); 1655 (RRc); 272 (RRe); 230 (RRd) \\
RR~Lyrae & SMC & \citet{Soszynski:2002} & 458 (RRab); 56 (RRc); 57 (RRd) \\
Cepheids & LMC & \citet{Udalski:1999b}& 1335 \\
Cepheids & SMC & \citet{Udalski:1999c}& 2049 \\
Double mode Cepheids & LMC & \citet{Soszynski:2000}& 81 \\
Double mode Cepheids & SMC & \citet{Udalski:1999d}&  95\\
Pop. II Cepheids & LMC & \citet{Kubiak:2003} & 14\\
Pop. II Cepheids & bulge & \citet{Kubiak:2003} & 54\\
Eclipsing binaries & LMC & \citet{Wyrzykowski:2003}& 2580\\
Eclipsing binaries & SMC & \citet{Wyrzykowski:2004}& 1350\\
Eclipsing binaries & LMC & \citet{Groenewegen:2005} & 178\\
Eclipsing binaries & SMC & \citet{Groenewegen:2005} & 16\\
Eclipsing binaries & Bulge & \citet{Groenewegen:2005} & 2053\\
Long period Variables & LMC & \citet{Soszynski:2005}& 3221\\
Mira & Bulge & \citet{2005MNRAS.364..117M} & 1968\\
Mira & Bulge & \citet{2005AandA...443..143G} &  2691\\
Various & Bulge & \citet{Mizerski:2002} & 4597  \\
$\delta$-Scuti & Bulge & \citet{2006MmSAI..77..223P}&193\\
\hline
\end{tabular}
\end{table}