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Figure 6


Fig. 6. (A–C) Numbers of photons absorbed by a hypothetical photoreceptor with a given {lambda}max relative to the number absorbed by the green receptor possessed by D. elpenor ({lambda}max=525 nm) under three illuminants (nautical twilight, full moon, starlight). (A) Viewing the white evening primrose. (B) Viewing green leaves. (C) Viewing the red hindwing of a conspecific. (D) The variation in relative quantum catches (among nautical twilight, moonlight and starlight), in a fused rhabdom containing all three visual pigments, as a function of the wavelength of the long wavelength receptor. The variation is estimated by the area of the triangle formed by the three points in the Maxwell triangle. As in A–C, the variation at 525 nm is set to 1.