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Main and aromatic sensors’ response values for Class I germplasms: (A), W5S sensitive to hydrocarbons, aromatic compounds; (B), W1S sensitive to short-chain alkanes such as methane; (C), W1W sensitive to terpenes and organosulfur compounds; (D), W2W sensitive to aromatic, sulfur and chlorine compounds; (E), W3S sensitive to long-chain alkanes; (F), W1C sensitive to aromatic benzene.
