Table 4. Parameters of the fitting curves f = 0.5x + b of the calculated logarithm of the effective photon flux N_eff values for various retinal eccentricities. COD is an abbreviation for the coefficient of determination.

Retinal eccentricity	b (value ± standard error)	COD
0 deg	24.23 ± 0.05 [log(photon·s–1·m–2)]	0.96
2.5 deg	23.90 ± 0.03 [log(photon·s–1·m–2)]	0.99
5 deg	23.83 ± 0.02 [log(photon·s–1·m–2)]	0.99