Left panels: Radial velocity of stars (red) and gas (blue) for galaxies B and C at redshift z = 0, which were chosen as illustrative examples. The solid blue curve indicates the median radial velocity of gas cells at a given radius; the dashed red curve indicates the radial velocity dispersion of star particles. Right panels: Gas cell density versus galactocentric distance. The solid black horizontal line shows the density threshold for star formation (ρ_min, SF ≈ 3.5 × 10⁶ M_⊙ kpc⁻³). The dashed horizontal line indicates the minimum wind-recoupling density, defined as ρ_{w, recouple} = 0.05 × ρ_min, SF. The minimum radius where recoupling may occur (i.e. where a gas cell falls below ρ_{w, recouple}) is indicated with a dashed red vertical line. Note that the quiescent zone between the inner clump and the outer disc roughly coincides with the ‘recoupling radius’, indicating that the star formation gap is caused by feedback winds.