Maps of A₂/A₀ Fourier mode strength (top panel), difference between the churning fluxes outwards and inwards (central panel, counted positive outwards), and normalised metallicity evolution (bottom panel) with respect to time and galactocentric radius, R, or guiding radius, R_g(t), for the K9_i (interacting Q=1.5 simulation, top three panels) and K7 simulations (isolated Q=1.5 simulation, bottom three panels). The grey area masks the first 0.6 Gyr displayed, when the disc is not fully relaxed yet. For the K9_i maps, the times of the pericentre passages of G_SMC are shown in dashed white lines, and its impact parameters are the white stars. The corotation radius is plotted in green and yellow for resonance with a bar or a weak central pattern, respectively.