Figure 6.

(Color online) Shifts in observer settings at each matching bandwidth as a function of the reference peak wavelength. Positive numbers on the Y-axis indicate a shift toward longer wavelengths when the narrower-band light is shown. Lines indicate the predicted pattern if matches are made by maintaining a constant spectral peak (horizontal line, constant prediction for all conditions) or by maintaining constant cone ratios (linear predictions, shown for each stimulus bandwidth). Labels below each set of matches indicate whether the observed matches were better fit by the Gaussian prediction (G) or the linear cone ratios (L); ns = errors of prediction in the two models did not significantly differ.