2D histogram of the projected distance to the main sequence in the SFR/mass plane vs. the W2−W3 colour, for the 148 685 galaxies of the SDSS MPA-JHU DR8 field cross-matched with the union catalogue of photometric redshifts. Top: histogram of the colour W2−W3. We have fitted two Gaussians for the early-type galaxies in red, and for the late-type galaxies in blue. Right: histogram of the projected distance to the main sequence. We have fitted three Gaussians: red and dead (in red), star-forming (in blue), and green valley (in green) galaxies. We set a threshold at W2−W3 = 2.85 (solid black line) to separate star-forming galaxies.
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