Main heating sources throughout the disk: FUV luminosity increasing from L_FUV = 10²⁹ (left) to 10³² erg/s. X-ray luminosity increasing from L_x = 0 to 10³² erg/s. background heating by [CII] (blue), PAH heating (orange), photo-electric heating (dark purple), X-ray Coulomb heating (light red), heating by collisional de-exciation of H₂ (blue-green), CI ionization heating (green-blue), infrared background by CO ro-vibrational lines (black), heating by thermal accomodation grains (white), cosmic ray heating (red), X-ray H₂ dissociation heating (light blue), free-free absorption (green), background heating by FeII (light green), background heating by SiII (green-yellow), infrared background heating by H₂O rotational transitions (yellow), heating by H₂ formation on dust (dark blue), and background heating by [OI] (purple).