Table 1. Percentage variance explained (in descending order) by the eigenvalues of Chelikowsky and Waber-Cromer orbital radii scales.

PCs	Chelikowsky (C) Scale (%)	Waber-Cromer (WC) Scale (%)
PC1	53.48	51.79
PC2	44.38	27.17
PC3	2.08	20.98
PC4	0.06	0.06

PC stand for principal components (eigenvectors).