Redshift ranges for an efficient use of the BzK and rJK colour diagrams. Left:BzK diagram for the selection of 0.3 ≤ z < 1.0 QGs. The yellow, blue, and red contours represent the loci of stars, SFGs, and QGs at 0.3 ≤ z < 1.0 selected by the NUVrJ + BzK selection. Sources with a 3σ detection at 24 μm in Jin et al. (2018) have been excluded. The black lines represent the original cuts by Daddi et al. (2004) to select galaxies at 1.4 ≲ z ≲ 2.5. The red lines show our cut at low redshifts (Eq. (1)). For reference, the tracks show the synthetic colours for the 13 Gyr elliptical (E), early-type spirals (Sa), and M82-like templates by Polletta et al. (2007), as marked in the labels. The colours are computed for 0.3 < z < 1.5 in step of Δz = 0.3. No evolutionary effects are included. The black segments show the reddening vectors at z = 0.3, 1, and 2. Right:rJK diagram for the selection of 1.0 ≤ z < 1.4 QGs. The yellow, blue, and red contours represent the loci of stars, SFGs, and QGs at 1.0 ≤ z < 1.4 selected by the NUVrJ + rJK selection. The remaining lines are coded as in the left panel.