# 7.4.2 Properties of the input data

Selection criteria:

• sources classified as candidate Cepheid and RR Lyrae variables from the Classifiers;

• 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.