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Color stimuli used in our study. (a) Spectral reflection curves of the artificial flowers and background. (b) Color loci of the stimuli in the color hexagon. The color space inside the central circle (< 0.1 hexagon units) appears achromatic for the bees. Colors for humans: 1, yellow; 2, UV-absorbing white; 3, blue; 4, turquoise; 5, red; 6, UV-reflecting white; 7, lemon.
