Fig. 5. Calculated relative quantum catch with 95% confidence intervals for hypothetical lycaenid photoreceptors based on the averaged reflectance spectra of wing colours and their 95% confidence intervals. (A) Flavonoid-free females. (B) Flavonoid-rich females. Data for both categories can be compared directly because they were normalised to their common maximum. The ordinate is the quantum catch (arbitrary units). The abscissa shows wing colours. P360–P568, rhodopsin nomograms with maximum sensitivity at 360nm (ultraviolet), 437nm (blue), 500nm (green) and 568nm (red), based on data from Lycaena (Bernard and Remington, 1991). An asterisk indicates non-overlapping confidence intervals and, therefore, statistically significant differences in quantum catch between food treatments.