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Fig. 4. Correlation between stimulus pulse amplitudes and amplitudes of the corresponding auditory brainstem response (ABR) waveforms in (A) P. costatus and (B) T. vittata. The different symbols represent different individuals tested. Regression equations are: ABR amplitude=amplitude of sound pulsesx(0.02–0.103) for A, and ABR amplitude=amplitude of sound pulsesx(0.00057–0.062) for B.