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Spectral envelope of the stimuli for different level: (A) 3 dB/harmonic (same attenuation than target melody), (B) 6 dB/harmonic (3 dB additional compared to the attenuation of target stimuli), (C) 10 dB/harmonic (7 dB additional), and (D) 25 dB/harmonic (22 dB additional).
