SFR vs. M⋆ plane for our DR7 SDSS galaxies, colour-coded by the intensity of the EW of the ISM NA I D line after the stellar continuum subtraction. Negative and positive EW values correspond to a residual emission and absorption feature, respectively. The white line shows the mode and dispersion of the MS (see Fig. 1). For the highlighted bins, A, B, and C, the Na I D line fit is shown in Fig. 5.
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