Main results from the spectral fitting of the LTG sample with the SSP base Z5 (cf. Sect. 2.2.2). The color coding and the meaning of the individual panels is as in Fig. 6. Panel a: ⟨δμ_9G ⟩ (r mag) vs. mass-weighted stellar age (Gyr) for the bulge component, with the solid line showing a linear fit to the data. Panel b: logarithm of the stellar mass (M_⊙) in the bulge vs. mass-weighted stellar age (Gyr). Galaxies spectroscopically classified as Seyfert and LINER (cf. panel f) are marked. Panel c: total stellar mass vs. . The solid and dashed lines show, respectively, a linear fit to the data and equality between both quantities. Panel d: Logarithm of vs. mass-weighted stellar metallicity . Panel e: logarithm of vs. logarithm of the mean stellar surface density Σ_⋆,B (M_⊙ kpc⁻²) in the bulge. Panel f: spectroscopic classification after BPT line ratios within simulated 3^′′ SDSS fibers (cf. Sect. 2.3).