Describir: Hue sensibility to dominant wave lenght chance the relation between saturation and colorimetric purity

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| |  \ ||  / //\ \\  `____ `  | || | || | |/\| ||  | ||__    | ' //  | || | || 
| |__/ || |  ___  || /___//   | \\_/ || |  /\  ||  | ||__    | . \\  | \\_/ || 
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