Uper panel: Effect of the environment on the D_n(4000) as in Fig. 7 but for all the galaxies in the samples (SF, composite, and AGN). Right panel: Galactic conformity on the D_n(4000) as in Fig. 8 but for all the galaxies in the samples (SF, composite, and AGN). The median trends and dispersion are shown as a function of the D_n(4000) of the central galaxy (squares and error bars, respectively coloured according to the corresponding colour bar).