Table 1.

Properties of cones used in the spectral model

Index (i)	Opsin	Cone Type	Gene	Peak Wavelength, nm	Relative Semisaturation, log(k)
1	UV	UV	SWS1	358	0.00
2	B1	Blue	SWS2	415	0.00
3	B2	Blue	Not known	440	0.50
4	G1	Green	RH2-1/RH2-2	460	0.00
5	G3	Green	RH2-3	480	1.00
6	R2	Red	LWS2	556	1.00
7	R1	Red	LWS1	575	1.00

k, Semisaturation irradiance. The opsins listed correspond to the seven physiological opsins identified in zebrafish retina. Two opsin types were reported in red cones (R1, R2), two in green cones (G1, G3), two in blue cones (B1, B2), and one physiological opsin observed in ultraviolet (UV) cones. i refers to cone number in the model (as in Eq. 1).