Distribution of the log(G₀) values of the PONOS simulation after RT post-processing. In black the distribution for the whole halo is shown, while in purple the disc, in orange the merger component, and in pink the CGM is represented. The high log(G₀) values are part of the disc and mergers, where the gas experiences UV radiation from young stars. The black dashed line represents the background radiation used in the SM and MPM.