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Fig. 2.


SFR vs. M plane for our DR7 SDSS galaxies, colour-coded by the percentage of objects showing a Na I D excess (NaDobs > NaDmod) in each bin, from the Na I D measurements of the MPA-JHU catalogue; only object with S/N >  2 in the single observed Na I D Lick measurements were included. The Na I D excess objects dominate the high-M region, while the number of the Na I D deficiency (NaDobs < NaDmod) objects increases at low stellar masses. The white line shows the mode and dispersion of the main sequence (see Fig. 1).

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