Fig. 2. Comparisons of pulse-rate preferences using different carrier frequencies at a playback level of 85 dB SPL (sound pressure level). Data for bimodal spectra were published previously (Gerhardt, 2005a) and are re-plotted here. (A) Preferences of females of H. chrysoscelis; (B) preferences of females 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<0.001). See Materials and methods and Results for details about the statistical analyses. N=number of female choices (one per female in each test).