Model light curves (white lines) and measurements (coloured points) of ASAS-052. The Y axis shows the observed magnitude, with no vertical shifts. Bands and instruments are labelled. Residuals (O − C) are shown below. For consistency, phase zero is set to the primary eclipse mid-time T₀. The phase of pericentre passage is marked with a vertical dotted line and labelled “Per”. Note how the depth of the secondary eclipse changes with wavelength.