SDSS true-colour images and respective SBPs for three exemplary LTGs, demonstrating the morphological differences of the three ⟨δμ_9G⟩ intervals tentatively defined in BP18. The synthetic SBPs were computed by convolving the observed IFS data with the SDSS r-band filter transmission curve after removal with ℛ𝒴 of stellar populations younger than 0.03, 0.1, 0.3, 1, 3, 5, 7, and 9 Gyr, being colour coded according to the age they represent. Shown in grey is the r-band SBP extracted from the SDSS photometric data. The vertical dashed line illustrates the estimated isophotal bulge radius ℛ_B, depicted in the true colour image by a while circle.