Variations in the AGN fraction (in %) with local overdensity (σ_δ) for all different types of AGN combined at 2 < z < 4 in two different mass bins divided at M_* = 10^10.2 M_⊙. The σ_δ bins are the same as in Figure 6. The diamond points correspond to galaxies with M_* > 10^10.2 M_⊙ and star points correspond to galaxies with M_* < 10^10.2 M_⊙. The figure shows a clear trend of an increasing AGN fraction with the increasing local overdensities of galaxies in both stellar mass bins.