Table 4.

Temperature prediction. Coefficients of determination ($R^2$) illustrating the predictive power of temperature prediction based on cross-validated PLSR (one to three PCs), averaged across the animal and the human datasets. See Fig. 6 for illustration.

	Animal dataset				Human dataset
	740 nm	840 nm	970 nm	720 to 880 nm	840 nm
$R^2$ (one PC)	0.599	0.695	0.113	0.697	0.796
${\mathit{R}}^2$ (two PCs)	0.599	0.696	0.112	0.713	0.797
$R^2$ (three PCs)	0.596	0.691	0.112	0.713	0.798