Fig. 6. (A-D) Timing of the first click of the female reply with changing duration of part C. y-axis values are from the start of part C while the diagonal line represents the timing of the end of the song. As females increase the number of clicks (from 1 to 4 clicks) and the duration of part C increases the first click is more inclined to fall within the male call - compare upper left to lower right in each panel.