Results for scenario (0) using v_adv = v_b from Eq. (15) (violet dashed line). Left panel: L_1.4 GHz–SFR relation. The green dashed and dot-dashed lines represent the primary and secondary synchrotron electron contribution, respectively, and the dotted violet line the free-free contribution. The total emission at L_1.4 GHz is also shown for two different prescriptions for v_adv, v_A (solid blue line) and v_sw (solid pink line). Right panel: L_γ–L_1.4 GHz relation. In both panels the grey shaded band indicates the 1σ confidence region of each fit (solid grey line) to the data sample (purple points).