Upper panel: average stellar mass density profiles obtained by binning the sample in total stellar mass, rescaling the 3.6 μm I₀ profiles in physical units and stacking them (the inset shows the same in a log-log scale, the R = 2 kpc distance highlighted with a dashed line). The solid lines trace Σ_∗ within the radial range with a 100% sample coverage. The dashed lines show Σ_∗ when the sample coverage is let to be greater than 75%. The dotted black lines correspond to the two-component Sérsic+exponential fit to the mean disks in the range with a 100% sample completeness level (see the text). The resulting disk parameters are listed in Table 1. The small vertical lines along the profiles indicate the standard deviation of the mean (σ/). For the bin with the largest M_∗, the vertical dotted lines indicate the sample dispersion (σ). Central panel: as in the upper panel, but separating barred (solid line) and non-barred (dashed line) systems (90% coverage). The vertical dotted lines indicate the mean bar size of the barred galaxies in each of the M_∗-bins. Lower panel: statistical dispersion of the rescaled luminosity profiles among the galaxies in each of the M_∗-bins used in the upper panel. Barred (solid lines) and non-barred (dashed lines) galaxies are studied separately.