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Fig. 2. (A) Spectral reflection curves of the background and stimuli measured
between 300 nm and 700 nm by means of an Ocean Optics S2000 spectrometer. (B)
Loci of all used colour stimuli plotted in the colour hexagon. Distance
between two loci is a measure of the bee-subjective similarity of colours. For
calculation and values, see Table
1 and Appendix.