(a) Differential rotation contrast in the RZ defined in Equation (32a), plotted with respect to case number. (b) Differential rotation contrast in the CZ defined in Equation (32b). (c) The confinement ratio f defined in Equation (34). Note that because of the chosen ordering, f monotonically decreases for the MHD cases within the radiative spreading regime. (d) The RZ’s shear-layer thickness defined in Equation (35).