Left column: mean Σ_∗ derived by stacking 3.6 μm 1D density profiles (S⁴G galaxies binned in total stellar mass) resized to the disk scalelength (upper panel), and deviation from an exponential disk (normalized to fit Σ_∗ at 2·h_R) of the mean Σ_∗ within the central regions (r ≤ 2h_R) (lower panel). Right column: as in the left column, but taking subsamples in terms of the revised Hubble type of the galaxies. For the upper panels, the different line styles indicate the 75% and 100% sample completeness level in the same fashion as in Fig. 5, and the vertical lines correspond to the standard error of the mean. In the upper left panel, for the bin with largest M_∗, we indicate the sample dispersion with vertical dotted lines.