Fig. 7. Upper panels: cross-correlograms illustrate signal relationships between fish for (A) Type 2 chirps (N=14), (B) AFRs (N=22), and (C) Type 2 chirps and AFRs (N=16). Means for all fish for all trials in which fish produced 10 or more signals are plotted, except in the case of Type 2 chirps where only male counts are used in the analysis. Horizontal line denotes the null distribution. Lower panels: bin-by-bin statistical analysis of the correlograms. The fraction of individual fish in which the corresponding bin height is either greater than expected by chance (P>0.95, black line) or less than expected by chance (P<0.05, grey line).