Oscillation mode frequencies of our Uranus model as a function of the angular number ℓ. Symbol sizes indicate surface gravitational potential perturbations, while symbol colors indicate surface radial velocities, for modes normalized to have equal energies. The f-modes typically have larger gravitational perturbations than low-order p-modes by a factor of ∼100, but smaller radial velocity perturbations by a similar factor. Modes of Jupiter and Saturn models have similar behavior, but with frequencies proportional to ﹩\sqrt{GM/{R}^{3}}﹩ in each case.