A comparison of the various important radii in the white dwarf accretion problem as a function of the stellar rotation rate Ω_⋆, magnetic field strength B_⋆, mass accretion rate ﹩\dot{M}﹩, and temperature T_⋆. The relative locations of these radii set the structure of the disk and the magnetic accretion flow. The Roche radius R_R sets the outer edge of the debris disk, the corotation radius R_c sets where magnetic coupling leads to accretion, the gas magnetic accretion radius ﹩{R}_{B}^{g}﹩ sets where the gas could be accreted, and the sublimation radius R_s sets where the dust is sublimated. The dust magnetic accretion radius ﹩{R}_{B}^{d}﹩ is always less than the white dwarf radius and so is not shown.