Panel (a): time-averaged (solid blue line) profile of the collapsar-disk scale height measured with respect to the midplane, where the shaded region denotes one standard deviation from the mean. Panel (b): same as panel (a), but for the mass-weighted angular-velocity profile. The black dashed line shows the Keplerian angular velocity, Ω_kep = 1/(r^3/2 + a). In both panels, the text box indicates the model. The time averaging is performed before the first jet is launched.