Variation of retrieved AlO abundance (VMR) as a function of phase (°) for the eight different retrieval setups, as detailed in each panel. The VMRs are averaged over the visible part of the disk, centred at each of the given phases, and taken at a pressure-layer cut of 0.18 bar at the equator. Stevenson and Mendonça refer to the use of Spitzer data analysed by Stevenson et al. (2017) and Mendonça et al. (2018a), respectively.