Correlation of galaxy fluxes with the mass of the host halo. The top panel includes only central galaxies, the bottom panel includes both central and satellite galaxies. The reference fluxes are F_Hα0 = 1 erg cm⁻² s⁻¹ and F_Y0 = F_J0 = F_H0 = 1 erg cm⁻² s⁻¹ Hz⁻¹, while the reference halo mass is give by M₀ = 1 h⁻¹ M_⊙, where M_⊙ is the mass of the Sun. The colourbar highlights the density of objects in arbitrary units.