Table 4. R² and RMSEP for dye ratio calculated from orthogonalized spectra of the dual-dye phantoms with different scattering and absorbance properties.

	value	R2	RMSEP (% dye ratio)
Total dye concentration (μg/mL)	3	0.999	1.90
	4	1.0	1.18
Number of dye tubes	8	0.999	1.45
	9	0.999	1.43
	10	1.0	1.31
Fat thickness (mm)	4.0	1.0	1.27
	6.0	0.999	1.60
	8.0	1.0	1.03
Overall		0.999	1.40