Table 1.

Wavelength determination for ${\mathrm{StO}}_2$ calculation (considering the absolute value of the slope).

Group	Skin type	Absolute value of slope 630 to 700 nm $({\mathrm{mm}}^{-1}/\mathrm{nm})$	Wavelength (nm).
I	Fair	$\text{Slope}<5\times {10}^{-4}$	622
II	Intermediate	$5\times {10}^{-4}<\text{slope}<8\times {10}^{-4}$	624
III	Brown	$8\times {10}^{-4}<\text{slope}$	626