GRAVITY data, best-fit model with both temperature profiles as defined in Paper I, and pure MARCS for AH Sco. Top panel: Normalised flux for the RSG AH Sco (grey), as observed with VLTI/GRAVITY in the K band. Our best-fit model is shown in red for RE and in blue for the chromospheric temperature model, while the pure MARCS model fit is shown in green. Remaining panels: Same as the upper panel but for the |V|² with different baselines (B). We see that the CO lines are in emission for the chromospheric temperature profile flux, which is not observed in the data.