Median sSFR as a function of redshift in different environments for all galaxies (gray) and SFGs only (blue). The circles connected by dashed lines and the squares connected by solid lines represent galaxies in the quarters of lowest and highest local density, respectively. The error bars indicate the 1σ uncertainties of the medians estimated via the bootstrapping method. The sSFR shows an environmental dependence for all galaxies but becomes independent of the environment at all redshifts when we consider the SFGs only.