Per-visit comparison between the nominal transit model and the phase-shifted EI model. Each row corresponds to one WASP-189b transit (V1–V3). The main panels display the observed white light curves (cyan for all visits, black for the highlighted visit) together with the best-fitting models: the nominal planet-only transit (solid blue) and the planet+EI model (dashed orange). The insets show the corresponding residuals, ΔF, relative to each model. The EI model is constructed as the pointwise minimum of the base transit and a phase-shifted replica, providing a diagnostic test for the presence of an earlier ingress.