Fig. 4.
Four odd axisymmetric modes at rotation Ω/Ωk = 0.589: (a) chaotic mode, (b) whispering gallery mode, (c) 2-period island mode (ℓ = 0), with a black line indicating the central periodic orbit, and (d) 6-period island mode. The figure shows the scaled pressure amplitude 
, with d the distance to the rotation axis and ρ0 the equilibrium density.
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