Two-dimensional projections of the M₂₀₀ = 6.63 × 10¹⁴ M_⊙ structure from TNG-300-3 depicted in the right-hand panels of Figs. 1 and 2. Left column: number of particles (representing column density). Middle column: sum of particle radial velocities (representing radial-velocity-weighted column density). Right column: average radial velocity (representing projections of the radial velocity field). Black circles indicate the location of R₂₀₀ and red circles the location of R_ta. Middle and right columns: red hues correspond to outflow and blue hues to infall.