Variation of the ¹²CO τ = 1 surface when considering the hydrostatic equilibrium model solutions. The left panel shows the output for a T Tauri system and Right panel the results for a Herbig system. Both models correspond to a disk mass of 10⁻² M_⊙. The dashed lines trace the surface from the parametric Gaussian distribution and the solid black line shows the final hydrostatic equilibrium solution considered. Each red line represents a model iteration of hydrostatic equilibrium in DALI.