Top panel: bolometric flux from our temperature model, normalized by the average between the minimum and maximum values, as a function of time (black curve and stars) and its fit by the toy model function (Eq. (6), blue curve). Bottom panel: rebinned normalized LC (stars) and its fit by the simplified toy model function (Eq. (9), red curve). The model parameters are fixed to γ_l = 0.3, γ_s = 0.05, b = 20 M, and i = 70°.