Flux and PD variations of A0620−00. Panel (a): Normalized flux, folded with the orbital phase (gray circles). The solid red line corresponds to the best fit of the data with the Fourier series, while the dashed blue line corresponds to the sinusoidal variations, assumed to be produced by the tidally distorted optical companion. Panel (b): Intrinsic PD of A0620−00 (red circles) folded with the orbital period together with the model of a scattering cloud on a circular orbit from the appendix of Kravtsov et al. 2020 (blue line).