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Time dependence of aq(t) from exponential fits to the amplitude of the largest Fourier component of the interface modulation when a 60-s perturbation with q = 0.0228 μm−1 (⧫) or q = 0.0162 μm−1 (○) is applied at t = 300 s, 900 s, 1,500 s, 2,100 s, 2,700 s, and 3,600 s, and comparison to the WL predictions.
