Fig. 4From: Age related decline in female lar gibbon great call performance suggests that call features correlate with physical conditionAnalysis of climax notes that are followed by high note inhalations versus those that are not, within animals. Climax notes that are followed by high notes are longer (a), have a higher maximum F0 frequency (b) and a higher delta F0 frequency (c) than notes that are not followed by high notes. White bars: climax notes not followed by a high note, Black bars: climax notes followed by a high note. Error bars represent ± 1 SEM. **: P < 0.01, ****: P < 0.0001Back to article page