Light curves of J0312 (left) and J1627 (right) folded with the orbital periods and the best-fitting models (solid lines). Two periods are shown for clarity. The orbital phases ϕ = 0.0 correspond to the minima of the models’ brightness. Panels show residuals calculated as the difference between the observed (O) and calculated (C) magnitudes for each data point in terms of the magnitude error, σ. Dashed lines correspond to 3σ levels.