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. 2018 Oct 23;9(5):2041669518803971. doi: 10.1177/2041669518803971

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© The Author(s) 2018

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Figure 11. — At left, the colour circle equispaced according to the Euclidean distance in the rgb cube. At right, a ‘well-tempered’ scale, graded according to the numbers of grains in equal hue angles.