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Fig. 9. Removal of mirror regions. Analysis of calls from one individual before (A) and after (B) removal of the membranes of Areas 1, 3 and 4 of the right tegmen. Oscillograms are shown in the left, power spectra in the middle and spectrograms on the right. Red arrows indicate the same frequency in the spectral displays (middle and right). After removal of Areas 1, 3 and 4, there was a decrease in the relative intensity of the fundamental and an increase in harmonic frequency components.