Fig. 1.
BPT diagram of elliptical galaxies from MaNGA. The dashed line is given by Kewley et al. (2001). The symbols correspond to classical elliptical (CLE) galaxies in red filled circles, recently quenched elliptical (RQE) galaxies in orange open squares, BSF elliptical galaxies in blue open stars, undetermined (UND) elliptical galaxies in black open diamonds, AGN elliptical galaxies in green filled hexagons, red star-forming ellipticals in red open circles, and blue retired galaxies (RG) in blue open circles. See the details of their classification in Sect. 3.
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