Comparative evolution of several quantities for the baseline model (column A on the left) and the case of two recent infall episodes in the outer disc (column B on the right). Top: infall rate in various radial zones, with the curves colour-coded as in previous figures (red: inner zones, blue: intermediate, green: outer; thick dashed: 8 kpc). Second from top: corresponding local SFRs. The subsequent five rows of panels are the same as in Fig. 5.