Model relations for the different scenarios considered (Table 2). The grey shaded band indicates the 1σ confidence region of each fit (grey solid line) to the data sample (purple points). In all panels the dotted lines represent the thermal emission, the dashed lines the non-thermal emission, and the solid line the total emission. Upper panel: for scenarios (0), (1), and (2) the L_1.4 GHz–SFR relation (left) and the L_1.4 GHz–L_IR relation (right) are shown. Middle panel: for scenarios (0), (3), and (4) (left) and (0), (5), and (6) (right) the L_1.4 GHz–SFR relation is shown. Bottom panel: for scenarios (0), (7), and (8) the L_1.4 GHz–SFR relation (left) is shown and for scenarios (0), (5), and (6) the L_150 MHz–SFR relation (right) is shown.