Table 1. Correlations between A3, R3, G3, and L2 and the 4 first principal components.

Our results revealed that the first 2 principal components accounted for ~ 50% of the overall variance,and the first four principal components accounted for nearly 80% of the variance. A3 was predominantly associated with principal components 2 and 3, G3 was predominantly associated with principle components 1 and 4, and R3 and L2 were associated with a combination of principal components 1 and 2.

	PC 1	PC 2	PC 3	PC 4
A3	0.025	−0.369	−0.457	0.179
R3	0.267	−0.354	−0.237	−0.031
G3	0.232	−0.065	−0.021	−0.567
L2	−0.380	−0.288	0.109	0.027