Folded Gaia light curves in the G band of the first 15 candidates with , in descending order. For each candidate, the Gaia DR3 id is given, together with the Gaia period in days and the value of . The epoch of the second-harmonic minimum corresponds to phases 0 and 0.5, and a three-harmonics model is plotted with a solid red line. All curves are plotted with a mag range of 0.4 for convenience. The residuals are plotted in the lower panels and are shown between −0.1 and 0.1 mag for clarity. Marked identifiers are of Gaia DR3 4068402346632484864, which might be an RR Lyrae variable, discussed in Sect. 6, and Gaia DR3 4042390512917208960, which is one of our brightest candidates, discussed in Sect. 7.