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. 2018 Sep 5;23(9):2261. doi: 10.3390/molecules23092261

Figure 1.

Figure 1

PCA and HCA performed on essential oil volatile compounds and their chemical classes. (a) The PCA biplot of essential oils based on their individual volatile compounds; (b) HCA dendrogram of essential oils based on their individual volatile compounds; (c) The PCA biplot of essential oils based on their chemical compound classes; (d) HCA dendrogram of essential oils based on their chemical compound classes. The numbers of chemical compounds are presented in Table 1; C1—monoterpene hydrocarbons; C2—sesquiterpene hydrocarbons; C3—oxygenated monoterpenes; C4—phenylpropanoids; C5—other compounds, and C6—unidentified compounds.