Table 1.

The extinction coefficients (Lmmol⁻¹cm⁻¹) of the reduced (εH_b) and (εH_bO₂) oxygenated hemoglobin at the wavelengths of 660 nm and 905 nm.

Wavelength (nm)	εHb	εHbO 2
660	0.81	0.08
905	0.21	0.30