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Fig. 5. Relationship between fundamental frequency and muscle activity during the
coo. (AC) Results of measurements in 16 544 calculated bins of 11 coos
from different bouts for individual D#3 and (DF) 9 435 calculated bins
of 5 coos from different bouts for individual D#1. (A,D) Frequencytime
relationships, linearly colour coded with time. Yellow corresponds to the
start of the coo, red to the end of the coo. (B,E) Bins of integrated TL EMG
activity normalised to maximal amplitude vs fundamental frequency of
the sound with the same colour-coding as A and D, respectively. (C,F) The
corresponding bin connections in time of the same bins in B and E,
respectively. The dotted lines in C and F indicate regions where the
relationship between TL activity and fundamental frequency of the sound
differs.