Synthetic SBP of a galaxy that consists of a bulge (red; approximated by a Sérsic model) and a more extended disk (blue; approximated by the modexp function; cf. Eq. (4)). Inside the isophotal radius of the bulge at 24 mag/▫″ (R_B = 20″), star formation quenching leads to a central dimming of the disk by 0.5 ≤ δμ₀ ≤ 2 relative to the exponential fit for R^⋆ ≥ R_B (orange). The composite bulge+disk SBP for a δμ₀ of 0.5 mag and 2 mag is shown with the dark and light gray curves, respectively.