Fig. 3. Representative absorbance spectra of rainbow trout cone photoreceptors. (A–D) Mean relative absorbance for the ultraviolet- (A), blue- (B), green- (C) and red-sensitive cones (D, two spectra represent curves dominated by the A₁ and A₂ visual pigments). The red line shows the mean absorbance spectrum and the blue line shows the eighth-order polynomial template. Note that the two spectra (red lines) in D represent the A₁-based visual pigment red-sensitive cones (curve peaking at 574nm) fitted by an eighth-order template and the A₂-based visual pigment red-sensitive cones (curve peaking at 623nm) fitted by a Fourier transform function. (E–H) The unbleached (red line) and bleached (blue line) absorbance of a single cone recording for the ultraviolet- (E), blue- (F), green- (G) and red-sensitive (H) cones. See Table1 for additional spectral data of cones.