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Principal Component Analysis—Projection of variables (TRG—trigonelline; COU—coumaric acid; CAFAc—caffeic acid; 5-CQA—5-O-caffeoylquinic acid; FER—ferulic acid; 3,5-diCQA—3,5-dicaffeoylquinic acid; 4,5-diCQA—4,5-dicaffeoylquinic acid; 3,4-diCQA—3,4-dicaffeoylquinic acid; 3-CQA—3-O-caffeoylquinic acid; CAF—caffeine; 4-CQA—4-O-caffeoylquinic acid; Nicotinamide, NicAcid—nicotinic acid; QUI—quinic acid; THP—theophylline; THB—theobromine).
