Fig. 3. Intensity dependence of pulse-rate preferences in tests between standard calls and alternatives with pulse rates at the low- and high-cutoff values (see text for definition). (A) Preferences of H. chrysoscelis; (B) preferences of H. versicolor. Error bars are 95% credible intervals, and statistically significant, post-hoc comparisons of least-square means between the proportions of females choosing the standard call depending on carrier frequency are indicated by asterisks (^*P<0.05; ^**P<0.01). See Materials and methods and Results for details about the statistical analyses. N=number of female choices (one per female in each test).