Measured vs. estimated values of (a) midplane number densities and (b) disk scale heights of the diffuse gas. The points and error bars give the mean and standard deviations over t/ t _orb = 2–3. The estimated midplane number density n _{0, DE} ≡ ρ _{0, DE}/(1.4 m _p ) and scale height H _{diff, DE} are obtained from dynamical equilibrium as Equations (39) and (40), respectively. The dashed lines show our best fits n ₀ = 1.4 n _{0, DE} and H _diff = 0.87 H _{diff, DE} for imposed unity slopes, while the dotted lines indicate one-to-one correspondence.