Cross-correlation trail map (left panel) and K_p–v_sys map (right panel) of NIRPS data, obtained with the reduction pipeline described in Section 4. Black dashed lines (right panel) denote the expected K_p determined from Prinoth et al. (2023), and v_sys=0 km s⁻¹. The colourmaps show a non-detection of Fe from two transits of WASP-189b observed with the NIRPS spectrograph. The observation gap occurred during the first transit on the night of 2023-04-24 is visible as a banded structure of higher scatter between phases 0.0 and 0.02 (left panel).