Table 2. Hellinger distances between pairs of colour categories from two dimensional colour subspaces (see Fig. 2).

	Interm.	Brown
Amount pheomelanin vs. Amount Eumelanin (Fig. 2a)
Blue	0.720	0.851
Interm.	0	0.495
Amount Nopigmentation vs. Amount Pheomelanin (Fig. 2b)
Blue	0.743	0.911
Interm.	0	0.491
Amount Nopigmentation vs. Amount Eumelanin (Fig. 2c)
Blue	0.734	0.923
Interm.	0	0.480
Mean Hue vs. Mean Saturation (Fig. 2d)
Blue	0.737	0.903
Interm.	0	0.470
Mean Luminosity vs. Mean Colourscore (Fig. 2e)
Blue	0.639	0.814
Interm.	0	0.473
Mean a* vs mean b* (Fig. 2f)
Blue	0.726	0.888
Interm.	0	0.495
Mean L vs. Mean a* (Fig. 2g)
Blue	0.461	0.838
Interm.	0	0.545
Mean L vs. Mean b* (Fig. 2h)
Blue	0.697	0.809
Interm.	0	0.491
PIE score (Fig. 2i)
Blue	0.668	0.794
Interm.	0	0.228
T-index (Fig. 2j)
Blue	0.323	0.733
Interm.	0	0.491

The higher the value close to one, the better is separability of the respective clusters in the quantitative colour space. Bold values denote the components that separate pairs of categories best.