图4. PCA分析图 图中3种颜色分别代表3种样本分组,每个矩形代表这一个样本的代谢组降维处理后投射在二维平面上的位置
Fig. 4. PCA analysis plot In the figure, the three colors represent three sample groups, respectively. Each rectangle represents the position projected on the two-dimensional plane after the metabolome dimension reduction treatment of this sample