Standard model, from top to bottom and from left to right: T_gas with overplotted gas temperature contours (white/black) and A_V = 1, 10 (red), T_dust with overplotted temperature contours (black/white) and A_V = 1, 10 (red), dust-to-gas mass ratio, average dust grain size, main cooling processes (CII fine structure lines, dust grain-gas thermal exchange, Ly α line, neutral O line cooling, CO rotational and ro-vibrational cooling, water rotational and ro-vibrational cooling, formaldehyde rotational cooling, ammonia rotational cooling, OIII line cooling), main heating processes (collisional excitation of vibrationally excited H₂, chemical heating due to H₂ formation on dust grains, dust grain-gas thermal exchange, heating from the superthermal photo-electrons produced by C, heating by cosmic rays, heating by the photo-electrons produced by polycyclic aromatic hydrocarbons, IR heating due to the water transitions, heating by mutual electron collisions, Coulomb heating, produced by X-rays photoionization, reaction free energy heating from exothermic reactions).