Distribution of rest-frame U−V color of VIPERS galaxies in redshift bin 0.8 < z < 0.9 is shown in gray. The dashed blue and solid red lines represent the Gaussian components corresponding to blue and red galaxy populations, respectively. The horizontal dashed red lines correspond to the separation of red passive galaxies between the crossing with blue distribution and an evolving cut in U−V (Fritz et al. 2014) adopted in this paper. Colors are given in the Vega system.