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Fig. 2. Syllable classification. (A) Sound spectrogram of four syllables produced
by six different individuals (Ind; individuals are identified by a number
corresponding to the location and a letter that differentiates them from their
neighbours inside the location). (B) Examples of syllables (Syl) classified as
`identical' or `different'. Sound spectrograms of 11 pairs of `identical'
syllables produced by two different individuals. Double lines separate groups
of syllables that have a similar shape but that were classified as
`different'.