Results of the cross-correlation analyses. (a) CCFs at the K_P presenting the maximum significance peak. (b) Cross-correlation maps (expressed as S/N) of potential signals for H₂O (left), HCN (middle), and NH₃ (right) with respect to the exoplanet rest-frame velocity (horizontal axis) and K_P (vertical axis). The horizontal dashed lines mark the expected K_P of WASP-76 b (~196 km s⁻¹). (c) Cross-correlation matrices in the Earth rest-frame. The transit occurs between the horizontal dashed lines and the tilted dashed lines mark the velocities of the highest significance signal. Larger versions of the cross-correlation matrices in the Earth’s rest frame and in the rest-frame of the exoplanet are shown in Appendix B.