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PCA analyses of (A) TIC and (B) spectrum profiles of three paired-herbs with typical cold or hot property, i.e., Ginseng Radix-Quinquefolium Radix, Angelica Sinensis Radix-Prepared Angelica Sinensis Radix, Rehmanniae Radix Praeparata-Dried Rehmanniae Radix. The distribution of each herbal extract in score scatter plots was calculated according to its correlation with the major components.
