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Multivariate statistical analysis reveals the main differential compounds of Yunnan Congou black tea samples in different tree ages. A: PCA scatter plot of black tea samples and QC samples. B: The HCA diagram of DB, HB, and TB samples. Scatter plot and loading plot of OPLS model of color (C and D) and OPLS model of taste (E and G) of different ages black tea samples. F: A Venn diagram showing the overlap of metabolites in DB, HB, and TB samples.
