Top: simulated mixed-mode spectrum. Radial and ℓ = 2 modes are absent, as depicted in Fig. 3. Bottom: power spectrum of P(τ) derived from the asymptotic relation. The initial ΔΠ1 value was settled at 300 s. The principal aliases observed around ΔΠ1 are indicated by red dashed lines. Harmonics of ΔΠ1 are also seen (green dashed lines).
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