Mach number estimates for northern (RN) and southern (RS) radio shocks in CIZA J2242.8+5301, derived from the radio spectral index (ℳ_R, teal) and the ICM X-ray analysis (ℳ_X, orange). The violin plots illustrate the distribution of Mach number estimates from the literature (listed in Table 4), highlighting the range and density of measured values. Overlaid points represent individual measurements, while the blue empty squares are the values derived in this work (see Sect. 4.1).