2D (top panel) and 3D (bottom panel) “tuning fork” diagrams from our simulation at different phases. These diagrams reflect the deviation of the H₂ depletion time centered on H₂ (τ_H2, gas, upper branch) or recent SFR peaks (τ_H2, SFR, lower branch) from the galaxy-averaged value as a function of the spatial scale L. The curves of the 1^st peak, Plateau, and 2^nd peak are multiplied by constants of 10, 100, and 1000, respectively, to avoid overlapping. The vertical lines indicate the scale when τ_H2, gas exceeds τ_H2, SFR by 50%.