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Table 1.

Chromatic and achromatic properties of the stimuli used

Achromatic properties
Chromatic properties
Relative quantum catch
Stimulus pairsΔSStimulusl-receptorAll receptors
Blue – green 25.8 White 
Blue – yellow 24.1 Yellow 0.81 0.69 
Blue – white 11.4 Green 0.28 0.24 
Blue – d. blue 1.6 Blue 0.13 0.21 
Yellow – white 13.6 D. yellow 0.11 0.09 
Yellow – d. yellow 6.0 D. green 0.04 0.03 
Yellow – green 5.8 D. blue 0.02 0.03 
Yellow – d. green 5.1 Arena 0.002 0.005 
D. yellow – blue 24.5    
D. yellow – green 11.8    
Green – d. green 10.9    
Achromatic properties
Chromatic properties
Relative quantum catch
Stimulus pairsΔSStimulusl-receptorAll receptors
Blue – green 25.8 White 
Blue – yellow 24.1 Yellow 0.81 0.69 
Blue – white 11.4 Green 0.28 0.24 
Blue – d. blue 1.6 Blue 0.13 0.21 
Yellow – white 13.6 D. yellow 0.11 0.09 
Yellow – d. yellow 6.0 D. green 0.04 0.03 
Yellow – green 5.8 D. blue 0.02 0.03 
Yellow – d. green 5.1 Arena 0.002 0.005 
D. yellow – blue 24.5    
D. yellow – green 11.8    
Green – d. green 10.9    

Left columns: chromatic distance (ΔS) between stimulus pairs as a measure of perceptual similarity between colours using a honeybee colour vision model [Receptor Noise Limited (RNL) model(Vorobyev et al., 2001)]. Right columns: relative difference in l-receptor quantum catch and in overall quantum catch of all three receptor types, normalised on the brightest stimulus (white)

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