Mass assembly history of the main galaxy cluster characterised by M_200,1 (t) (left-hand panels) and corresponding radio power per unit frequency at 1.4 GHz (right-hand panels) as a function of cosmic time for different cluster regions in our sample. Solid, dash-dotted, and dashed lines show all radio luminosity measured within R_200,1(t), R_vir,1 (t), and 2R_200,1(t), respectively. Major mergers with ∆M/M ≥ 0.5 are highlighted by the vertical grey and light red colour bands corresponding to the t_afler – t_before and t_end – t_start time intervals. Blue arrows in the left panels indicate the core-passage time of each merger.