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Table 2 Summary results of principal components analysis (PCA) of external measurements of Brachypteryx montana cruralis, B. m. sinensis, and B. m. goodfellowi (individual PC I and PC II scores graphed in Fig. Y)

From: Taxonomy of the White-browed Shortwing (Brachypteryx montana) complex on mainland Asia and Taiwan: an integrative approach supports recognition of three instead of one species

Component loadings PC I PC II PC III
External measurement
 Culmen from skull − 0.27 0.17 0.16
 Culmen from feathers − 0.35 0.14 0.09
 Bill width 0.07 − 0.01 0.01
 Bill depth − 0.07 0.06 0.04
 Wing length 0.69 1.35 − 1.32
 Primary projection − 0.68 0.46 − 0.38
 Primary 1 length − 0.66 0.07 − 0.36
 Primary 1 shortfall 0.95 0.87 − 0.68
 Primary 2 shortfall 0.38 0.82 0.16
 Primary 3 shortfall 0.02 0.47 0.29
 Primary 4 shortfall 0.08 0.19 0.04
 Primary 5 shortfall 0.01 0.02 0.00
 Tail length 3.39 0.52 0.62
 Tail graduation − 0.30 1.22 1.24
 Undertail coverts to tail tip 2.96 − 0.69 0.09
 Tarsus length − 1.37 0.69 0.63
 Tarsus distal width − 0.13 0.05 0.01
 Hind claw length − 0.29 0.15 0.01
Eigenvalues 24.881 6.52 4.96
% Total variance explained 48.97 12.83 9.77
  1. The most important loadings on each factor are shown in italics