Propagation of two gravity waves calculated by raytracing. The top panel shows a wave at the low-frequency ω₁ = 3 × 10^-3 mHz. The ray spirals toward the center with an almost radial wavevector, i.e., k_h ≪ k_r. In the bottom panel, a higher frequency wave with ω₂ = 0.2 mHz is represented with arrows indicating the directions of k, k_r, and k_h. The scale is respected, so . Blue arrows in the top right of each panel point out the place where both waves are excited.