a: over a simulated solar cycle. The dashed and dotted lines, as in Fig. 7, mark at T1 and T2. The scenario where the activity peak is below T1 (red), at T1 (green), between T1 and T2 (blue), at T2 (purple) and above T2 (cyan) are depicted. b: TSI corresponding to each scenario, similarly colour-coded, as given by the empirical relationship between A(TSI) and (black curve, Fig. 7). The difference to the 2008 minimum TSI level (solid black line) is drawn.