CUTE NUV transit and spectral analysis for WASP-189b. Top: White-light curves for three visits (V1, V2, and V3; coloured points) and all data combined, with best-fit transit models (dashed lines) and uncertainties (grey shading). The magenta star marks Event 662 in V3. Middle: residuals relative to best-fit models for each visit and all data, highlighting deviations in V3 (orange). Bottom: Spectral map for V3: flux as a function of wavelength and phase, normalised to the continuum/ The colour scale shows fractional deviations. Anomalous features after egress (Event 662) indicate transient variability.