Simulation of the radial surface brightness and color distribution for a centrally SF-quenched LTG. Upper panel: surface brightness profiles in B and R (blue and red, respectively) for the bulge and disk (thin and thick curves, respectively) for a synthetic galaxy with a constant B–R color of 1.54 mag in its bulge and 0.74 mag in its outer disk (R^⋆ > R_B = 20″). The disk is modeled by modexp profiles with a different central depression parameter ϵ₁ in B and R such as to simulate a central SF quenching with a δμ₀ = 1 mag in B and a color that smoothly increases inward of R_B from 0.74 mag to 1.54 mag (cf. lower panel). Lower panel: true B–R color of the bulge (solid red line), true-color profile of the disk (blue), and observed color profile resulting from the superposition of the bulge and the disk in the case of SFQ (orange) and no SFQ (black). The dashed red curve shows the color profile that would be obtained for the bulge if the correction for the underlying disk were made by assuming a pure exponential (instead of a modexp) profile for it, that is, when SFQ is neglected.