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Fig. 5. Biplot of the SREG2 for four synthetics (T1S, T2S, T3S, and T4S) and 12 acid soil environments (E1, E5, E6, E7, E9, E10, E12, E13, E14, E17, E19, and E20). The first and second multiplicative components are represented by PC1 and PC2, respectively.