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Fig. 1. Example spectrograms of CLCs from individual JG. (A) Spontaneously produced
CLC. In this case the call consists of a short, downward frequency modulated
`chirp', followed by three relatively constant frequency `whistles'. (B) A CLC
that received 1 s white noise feedback with a delay of 0.5 s, showing that the
final whistle has been omitted. (C) The same CLC as in B with white noise
feedback removed (see Materials and methods for details).