Impact of the effective ellipticity ε_eff on the levels of bias. Top: Δp/σ_p,0 as a function of the effective ellipticity ε_eff, displayed for three levels of the S/N, p₀/σ_p,G = 1, 2, and 5. The grey shaded regions indicate the whole extent of variability due to ψ₀ and θ spanning the range − π/ 2 to π/ 2. Bottom: maximum | Δψ | /σ_ψ,0 value for ψ₀ and θ spanning the range − π/ 2 to π/ 2, plotted as a function of the effective ellipticity ε_eff, displayed for four levels of the S/N, p₀/σ_p,G = 0.5, 1, 2, and 5.