Two variants of (1 + 1)D hydrostatic disk models. Depicted quantities are explained in Fig. 4, but shown here in comparison to the reference model. The upper half shows the results for the simplified hydrostatic model based on the dust temperature T_dust and a constant molecular weight, i.e. sound speed . The lower half shows the full hydrostatic model based on the gas temperature structure T_gas and the proper mean molecular weight μ as resultant from the chemistry and heating and cooling balance, i.e. .