Multiplicative (left panel) and additive (right panel) shear bias differences as functions of effective radius (R_e) and Sérsic index (n), using a Euclid/VIS pixel scale of 0$\stackrel{″}{.}$1 and a lanczos15 interpolation kernel. The analysis accounts for noise correlations in S/N matching between the D and E images (test Ic), as detailed in Sect. 5.2. The data points show the bias obtained from the fit with the error bars indicating 1σ uncertainties for a number of galaxies N_gal for S/N ≃ 40.