Top left: Orbital phase vs. magnitude in the OGLE I band for OGLE-LMC-DPV-097. The red points show the maximum of the long cycle, and the black points show the minimum. The grey dots represent other phases of the long cycle. Top right: Comparative illustration of the binary system at orbital phase 0.55 in the maximum and minimum phases of the long cycle based on the orbital light-curve models of Garcés et al. (2018). Bottom left: Same as above, but for OGLE-BLG-ECL-157529. Bottom right: Behaviour of the accretion disc in OGLE-BLG-ECL-157529 according to the best-fitting orbital light-curve models LC-4 (long-cycle minimum) and LC-7 (maximum) from Mennickent & Djurašević (2021, see Table A.1 of that study).