(a) The vertical turbulent velocity dispersion of the diffuse gas v _{z, diff}, (b) the total (turbulent+thermal) velocity dispersion of the diffuse gas σ _{z, diff}, and (c) the total velocity dispersion of all gas σ _z, as functions of the SFR surface density Σ _SFR for all models except Series R. The points and error bars give the mean and standard deviations over t/ t _orb = 2–3. For the whole set of models shown in this figure, v _{z, diff} = 6.8 ± 0.6 km s ⁻¹, σ _{z, diff} = 7.7 ± 0.6 km s ⁻¹, and σ _z = 7.0 ± 0.4 km s ⁻¹. The dotted lines in all panels show 7 km s ⁻¹ for reference.