Investigating the divergence between the Sérsic n derived from C₈₂ and that measured from single-component 2D decompositions. Top-left panel: concentration parameter vs. Sérsic index, the latter being derived from single-component 2D decompositions for all S⁴G galaxies. The solid black line shows the theoretical behavior of C₈₂ for Sérsic profiles of varying n. Here and in subsequent panels, the dashed black line shows the median of points in equal-width bins (bins with fewer than five points are ignored). Bottom-left panel: we show the difference between our asymptotic magnitudes and those derived from decompositions (negative numbers mean the asymptotic magnitudes are fainter). The solid black line here and in the following panels shows a value of 0 (no difference). Top-right panel: difference between R₂₀ derived from single-component decompositions and those derived from our curves of growth for 3.6 μm imaging. The vertical dotted line shows the size of three IRAC 3.6 μm resolution elements. Bottom-right panel: the same as the top-right panel, but shows the behavior of R₈₀. ETG data points are multicolored (with dwarfs in cyan), while LTGs are shown in gray.