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Electroantennographic responses of Heliconius butterflies to conspecific and heterospecific wing extracts. Stimuli: air (white), dichloromethane plus 2‐tetradecyl acetate (internal standard) (dark gray), hexane (light gray), Lantana extract (green), natural male H. melpomene wing extract (red), synthetic H. melpomene blend (pink), natural male H. cydno wing extract (dark blue), synthetic H. cydno blend (blue). Bars: average of normalized corrected amplitude ± standard deviation.
