Density map of the primary eclipse depth versus duration (in days) for the samples 2G-A (top panel), 2G-D (middle panel), and 1G (bottom panel). The primary eclipse duration is taken equal to w_ecl, 1 P_orb. The larger occurrence of eclipse depths larger than about 1 mag for eclipse durations between ∼0.07 and ∼0.17 days is linked to the equivalent time intervals between successive observations in the two Gaia FOVs (see text, Sect. A.1). The axis ranges have been limited for improved visibility.