Fig. 7. Spectral sensitivity data (closed circles; A,B) are well modeled by both the SSH rhodopsin template (A,B) and the GFRKD template (described by Govardovskii et al., 2000) (C,D). For the lower eye the models give an -peak absorbance of 498 nm (A) and 496 nm (C). Both models deviate in the ß-peak range and produce similar correlations (0.927, SSH; 0.903, GFRKD). For the upper eye models yield peaks of 496 nm (B) and 495 nm (D), again with similar correlations (0.909, SSH; 0.887, GFRKD).