Fig. 5

Modelled spectra of dark- (blue line) and light- (red line) adapted eyes with the recorded spectral sensitivities shown in Fig. 4 b and c (circles). Model fits were performed over the wavelength range for which pigment spectra were available. For coefficients, see Table 1. a Niigata strain. Dotted spectra show visual pigment templates (grey, S; blue, M; green, L) with their relative peak values according to f _i. The solid black line denotes the sum of these three spectra, i.e. the sensitivity in the absence of screening pigment. b Nagano strain. For illustration (because the light-adapted spectrum is based on a single individual and may therefore be noisy), half-filled squares show the averaged spectral sensitivity shown in Fig. 4 a with open triangles, scaled to the appropriate amplitude