Criteria for selecting star-forming galaxies. The solid and dashed lines show the color evolution of star-forming and passive galaxies, respectively. Red, green, and blue dashed lines show the passively evolving models with a formation redshift of zf = 2,3,6, respectively. Red, green, and blue solid lines show models that evolve with a constant star-formation rate for ages of 0.2, 1, and 2 Gyr. The horizontal dashed line indicates the color cut U2XnK ≡ (U2 − Xn) − (Xn − K) = 0. In each panel, the star-forming galaxies are located above this threshold. The yellow shaded regions mark the redshift range of the selected BJG samples in each color combination. Dashed vertical lines indicate the redshift 0.5 and 1.5.
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