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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 12. — These are distances from points on the full colour locus to the black-white axis. Apparently, the primary colours red, green, and blue are most highly chromatic, the secondary colours cyan, magenta, and yellow least.