Bulge Sérsic index (n) plotted against nuclear emission type and bulge stellar mass. Core-Sérsic galaxies (enclosed in boxes) are massive and they harbor either a LINER or an ALG nucleus. The only core-Sérsic galaxy with nuclear emission associated with star-formation (H II) is the massive (M_*, bulge ∼ 3.2 × 10¹² M_⊙) S0 NGC 3665. The blue curve connects the median Sérsic indices for the four optical emission-line classes.