Vertical scale height as a function of the gas vertical velocity dispersion. The solid lines are computed for the “star-dominated disk” limiting form of the hydrostatic equilibrium in the disk plane (Eq. (10)) plotted for a range of possible values of the stellar disk parametrization H_⋆ = 0.3 − 3 kpc and Σ_⋆ = 320 − 950  M_⊙ pc^-2. The dashed lines plot the scale height values given by the balance between the turbulent heating rate and the observed [Cii]+H₂ line cooling rate (Eq. (8)), for two values of the efficiency parameter ϵ (50% and 100%, see Sect. 7 for details). The grey area shows the plausible (σ_g, H_g) parameter space for the 3C 326N gas disk.