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Modification of the eardrum depth. (a) The anatomically normal eardrum. (Center) The z coordinate of all of the points is divided by a factor of 10 to obtain the shallow eardrum (Left), and multiplied by a factor of 2 to obtain the steep eardrum (Right). (b) Effect of eardrum depth on the middle ear pressure transfer function. The deep eardrum is nearly the same as the normal, but the shallow eardrum has a >20-dB loss at higher frequencies.
