Time–distance diagrams of the x component of velocity at y = z = 0 and x ∈ [0, 2R] for the simulations of the m = 2 mode with v₀/v_A, i = 0.05 and ρ_i/ρ_e = 5. From left to right, the four panels correspond to the results with l/R = 0, 0.25, 0.5, and 1, respectively. The vertical dashed black lines denote the boundaries of the nonuniform region. The dashed white contours represent the expected behavior of the quasi-mode in each case.