sources classified as candidate Cepheid and RR Lyrae variables from the
a minimum number of 12 G-FoV transits, before applying an outlier removal
procedure specifically tailored to Cepheids and RR Lyrae stars to discard
obvious wrong epoch data;
a peak-to-peak amplitude > 0.1 mag in the G-band;
periods in the range of 0.2-1.0 days for the RR Lyrae variables.