Aspect ratio as a function of the orbital distance for discs with a viscosity of α = 5 × 10⁻³. Left: aspect ratio for discs with different water abundances that feature a transition in the dust fragmentation velocity from 1 to 5 m s⁻¹ and a dust-to-gas ratio of 1%. Right: aspect ratio of discs with different dust-to-gas ratios that feature a transition in the dust fragmentation velocity from 1 to 5 m s⁻¹. Furthermore, we show the effects of a transition in the fragmentation velocity from 1 to 10 m s⁻¹ for a disc with a dust-to-gas ratio of 1%.