Examples of neutral-to-total gas profile evolution for a few AGNs selected at z = 0. In each panel, we show the profile of a specific galaxy at different times, before and after the black hole seeding. The two latest available profiles before t_seed are shown as blue and gray solid lines, the earliest available profile after t_seed is shown as a red solid line, and the present profile is shown as a black dotted line. The availability of the profiles depends on the type of simulation snapshot; see Section 2.3 for details. Each row is dedicated to a bin of black hole seeding times, in the top row t_seed < 1 Gyr, and in the bottom row t_seed > 3 Gyr. From left to right: Stellar mass of the example galaxies increasing in bins of roughly 0.25 dex.