The distribution of the real (black lines) and imaginary (grey lines) parts of the wavenumber inferred from measurements of the BM frequency response at seven positions along the length of the cochlea using an inversion procedure [15] (reprinted with permission from Journal of the Acoustical Society of America, 122, Shera, Laser Amplification with a Twist: Traveling-Wave Propagation and Gain Functions from throughout the Cochlea, 2738–2758, Copyright , Acoustic Society of America).
