Table 3.

Rotated loading of ten variables on four factors.

Variable	Rotated factor loading
	Factor 1	Factor 2	Factor 3	Factor 4
NA%	0.950	−0.107	−0.008	0.103
H	−0.905	0.018	−0.069	−0.035
CA	0.805	−0.168	−0.215	0.168
AOA	−0.439	0.542	0.394	0.094
W_fre	0.263	−0.811	0.041	0.055
W_len	0.080	0.794	−0.050	0.070
Fam	0.414	−0.148	−0.728	0.229
VC	0.153	−0.137	0.845	0.013
OA	0.307	0.273	−0.070	0.668
VA	−0.023	−0.116	−0.046	0.889
Eigenvalue	3.462	1.664	1.318	1.042
% Variance	29.289	17.493	14.621	13.452

Variable abbreviations are the same as in Table 1.