Table 2.

Correlations (r) between SOM content and principal component analysis (PCA) in the calibration set and validation set.

Data Set	PC1	PC2	PC3	PC4	PC5
Calibration set	–0.37	0.31	–0.06	0.43	–0.19
Validation set	–0.08	0.27	–0.42	0.31	–0.05