Correspondence between observational overdensity significances of quasars and their z = 0 descendant halo masses of quasars and simulated g-dropouts. The blue histogram shows the distribution of maximum overdensity significances centered on quasars with a radius of 1΄, which is exactly the same as figure 3a. The orange, red, and green lines indicate the simulated g-dropout overdensity significance distributions with z = 0 descendant halo masses M_{h, z = 0} = 10¹² M_⊙ –10¹³ M_⊙ , M_{h, z = 0} = 10¹³ M_⊙ –10¹⁴ M_⊙ , and M_{h, z = 0} > 10¹⁴ M_⊙ , respectively. Their overdensity significances are those simulated for z ∼ 4. (Color online)