Dependence of the radial and azimuthal velocities (in units of sound speed a), the midplane disk density ρ₀ (relative to its value at R = R_eq), the angular momentum-loss rate in units of equator release angular momentum-loss rate , and the midplane maximum MRI growth rate iω and the radial part of the Brunt-Väisälä frequency N_R in units of the disk angular velocity on the radius in a viscous disk. We assumed a viscosity parameter α = 0.1 here. The arrow denotes the location of the critical point.