Estimate of the bias induced by the radial model as a function of wavenumber. Top: bias induced by the removal of fluctuations implied by the fit of the radial model (Equation C.1). Bottom: excess fluctuations induced by the mismodelling, relative to a reference pressure fluctuation power spectrum (σ_𝒫 = 0.5, L_inj = 750 kpc, α = −11/3 and L_dis = 1 kpc). The different colours represent the different models, according to Section 5.1. In the right panel, the different line styles refer to the different input radial model. In both panels, the vertical dashed line gives k = 1/L_inj.