Left: integrated spectrum of the Toothbrush relic between 58 MHz and 18.6 GHz. Dashed lines show the fitted power laws. The spectrum follows a close power law with a slope of α = −1.16 ± 0.03. The new flux density points are highlighted by the cyan regions; the other values are adopted from Rajpurohit et al. (2020). Right: possible impact of SZ decrement (shown with horizontal color lines) as a function of line of sight depth (d_LOS) on the radio spectra of the relic emission. Blue circles show the observed flux densities. In order to produce an SZ decrement compatible within the error-bars of the new 14.25 and 18.6 GHz observations, the depth of the shock pressure jump along the line of sight is required to be d_LOS ≤ 600 kpc.