Effect of changing different ProDiMo assumptions in the [O i] 63 μm and CO P(10) line fluxes in one representative example of the family of models 3. The star indicates the observed line fluxes. The cyan intervals represent the 20% error on the CO P(10) line flux and 40% error in the [O i] 63 μm line flux. In the legend the symbols mean: G/D: gas-to-dust ratio; CO_pump: CO ro-vibrational emission calculated including UV fluorescent excitation; H₂O_cooling: gas temperature calculated including ro-vibrational water cooling (pure rotational H₂O cooling is always taken into account); low Z: low disk metallicity; O/C: oxygen over carbon abundance ratio; T_gas = T_dust: maximum possible cooling; no PAH: gas heating calculated without the effect of PAHs.