Fig. 6
The color (g − i) vs. i-luminosity diagram of galaxies studied in this work. Top panel: small black dots represent the 4900 galaxies from SDSS; large filled symbols mark the 130 galaxies for which a nuclear spectrum was taken at Loiano, and large open symbols mark the 112 galaxies yet without spectra. Middle panel: HII regions (turquoise), SEY (blue), and sAGN (green) form the blue sequence. Bottom panel: LIN (red), RET (orange), and PAS (black) form the red sequence.
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