Fig. 3

The relationship between PCSA and FL of individual PIFMs with the result of k-means clustering. The yellow, red, orange, and blue area indicate clusters 1, 2, 3, and 4, respectively. The circles, diamond, star, downward-triangle, cross, upward triangle, and square plots indicate ABDH, ABDM, ADDH-OH, ADDH-TH, FDB, FHB, and QP