Measured C (left), G (middle), and M₂₀ (right) as a function of R_e/FWHM, with different colours representing different Sérsic indices. The top and bottom rows show the directly measured structural parameter (C, G, and M₂₀) and the deviation from the intrinsic values (ΔC, ΔG, and ΔM₂₀), respectively. As the galaxy becomes smaller, C, G, and M₂₀ gradually converge to the corresponding values of the PSF.