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Fig. 4.


Distributions of the color gradients for the four colors. Red bars indicate the color gradients assessed by fitting to the color profile, blue bars display the analytically derived gradients. The corresponding dashed lines denotes the respective means, and the gray dotted line indicates a color gradient ∇(λ1λ2) = 0. For all four colors and independent of method, we derive negative mean color gradients.

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