Cross-correlation functions with molecular templates at the position of the planet in Fig. 3. The peaks indicate the presence of H₂O and CO in the atmosphere of AF Lep b at an (uncalibrated) RV of approximately 20 km s⁻¹ (vertical line). The cross-correlation functions were standardised over the spatial axes in the same way as our molecular maps: the cross-correlation map at each RV was mean-subtracted and normalised by its standard deviation over the whole image.