Total cross-correlation diagrams for the four models illustrated in Fig. 2 after summing over time for a range of V_sys and K_P values, and combining detectors 2 and 3 from the three observation nights. The dashed white lines indicate the expected planet signal based on literature values, which coincides with a weak correlation signal in the case of the two absorption models as well as the weak-inversion model, and a weak anti-correlation signal in the case of the strong-inversion model. Although there are hints of a signal visible, CO is not detected with statistical significance.