Long cycle after the separation for OGLE-LMC-DPV-097 and OGLE-BLG-ECL-157529 (panels a.1 and a.2). The red and black dots indicate the observation epochs corresponding to the maximum and minimum of the long cycle according to the ranges defined in Sect. 3.3. Panels b.1, b.2, c.1, and c.2 present the orbital light curves during the maximum and minimum phases of the long cycle for the two systems. The dashed line marks the estimated magnitude near orbital phase Φ_o ∼ 0.5, and the shaded region represents the 1σ confidence interval (see Sect. 3.4). The grey dots in panels b.1, b.2, c.1, and c.2 correspond to the same observation epochs as in panels a.1 and a.2. For OGLE-BLG-ECL-157529, only epochs with the largest long-cycle amplitude are displayed (see panel a.2).