Fig. 7
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Top: schematic of the H2O distribution in the two discs. Middle: surface brightness profile (azimuthally averaged) of the milllmetre dust continuum at 1.2 mm for HD 163296 (from DSHARP survey, Andrews et al. 2018; Huang et al. 2018) and at 0.87 mm for HD 100546 (Pineda et al. 2019; Fedele et al. 2021) in the inner 100 au. Bottom: water-emitting region (cyan) overlaid on the ALMA dust continuum image. Notably in the case of HD 163296, the size of the H2O-emitting region corresponds to the narrow dust gap at 10 au. This may be due to dust growth at the border of the snow line.
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