Neutral Fe cross-correlation from two transits of WASP-189b observed with the HARPS spectrograph. Left panel: cross-correlation time series corrected for the Rossiter–McLauglin contribution. The planetary trail follows the Keplerian motion in red, and it is bound within the transit window (first and fourth contact transit phases indicated by horizontal black dashed line). Right panel: K_p−v_sys diagram. The black dashed lines denote the expected v_sys and K_p from Prinoth et al. (2023). The region enclosed in the cyan dotted box is used for the calculation of the S/N used throughout the entire map. Features around +50 and −50 km/s are residuals of the Rossiter-McLaughlin correction fitting and not due statistical fluctuations (Section 4.3.1).