Pearson correlation coefficients (r) between sets of curves or sets of wavelength peaks.

Items (1) to (3), below, correlate sets of curves where data were sampled at 5 nm intervals in the range 400–640 nm. For items (4) to (7), all peak wavelengths, not merely the means, were taken to calculate r. Coefficients are listed for: (1) correlation between cone sensitivity curves [51] and opponent chromatic response curves [9] as arranged in Fig. 6; (2) correlation between predicted curves from Eqs. (4)–(6) and SML cone curves in Fig. 7; (3) correlation between predicted curves from Eq. (4)–(6) and bgy chromatic response curves in Fig. 7; (4) correlation between SML and bgy sets of wavelength peaks (bgy from hue cancellation data), Table 2; (5) correlation between SML and bgy sets of wavelength peaks from all data (both Tables 1 & 2); (6) correlation between SML (Table 2) and bgy sets of wavelength peaks (bgy from vision models), Table 1; and (7) correlation between SML and bgy sets of curve crossover wavelengths from Table 4, columns 3 and 4.