Best-fit median light curves at 1.4 GHz inside the R_200,1 (t) spheres normalised to the radio luminosity output at core-passage, P_1,4(0), as a function of time relative to the core-passage time for galaxy group and cluster mergers. Different curves correspond to M_200,1 mass bins of [1, 2.5), [2.5, 5), [5, 7.5), [7.5, 10), [10, 25), [25, 50), [50, ∞) in units of 10¹³ M_⊙ (from light blue to red, respectively).