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It shows the normalized mean spectrum of the color squares in a V-CUBE® Rubik’s cube (red, green, blue, orange, yellow, and black). We subtracted the mean spectrum of the entire Rubik’s cube from the mean spectrum of every color, and we bounded them to non-negative values before to be plotted. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)
