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Fig. 4. Visual contrasts generated by UV-absorbing T. spectabilis (black bars, N=28) and natural T. spectabilis (white bars, N=25; calculation based on data taken from Heiling et al., 2003) on daisy petals from the view of honeybees and blue tits. Values are means ± S.D.; only one S.D. bar is drawn to simplify the graph. *P<0.001.





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