Results for the generic disk models without central source and an initially molecular gas (Table 1). Top panel: gas temperature vs radius in the case of a generic disk model without central source, assuming different accretion rates. Middle panel: abundances of H, H₂, H⁺, H, H⁻ vs. radius for the reference case NS3 (disk with no source, accretion rate 10^-3 M_⊙ yr^-1). Bottom panel: heating and cooling contributions vs radius for the reference case NS3 (disk with no source, accretion rate 10^-3 M_⊙ yr^-1). We refer to Table 3 for the heating/cooling contributions defined in the legend.