Spatially resolved Kennicutt–Schimdt relation for NGC4321. The surface density of SFR (Σ_SFR) is reported as a function of Σ_HI (left panel), Σ_H2 (central panel), and the total (HI + H2) gas surface density (right panel). The three upper panels are colour-coded as a function of the distance to the MS. The lower panels indicate the galacto-centric distance of each physical galaxy cell. Diamonds correspond to regions associated with the quenched ring.