Results for the fitting of b/t in double-Sérsic multi-band data. The three lines represent the results for three different selections of galaxies. From top to bottom: bright galaxies (14 < I_E < 20); intermediate galaxies (20 < I_E < 23); and faint galaxies (23 < I_E < 26). The three columns represents our three metrics, the bias ℬ, the dispersion 𝒟, and the outlier fraction 𝒪, which are plotted on the y-axis of the corresponding columns. The x-axis represents the different bands, ordered by increasing wavelength (I_E overlaps with g, r, and i). The background colours show the Euclid bands in blue and the Rubin bands in red.