Table 1.

Ranges of OPs for each compartment or medium.

Tissue type	${\mu }_a$ (1/cm)	${\mu }_s^{\prime }$ (1/cm)	$n$	$g$
Outer medium	0	0	1.457	—
Scalp	0.1 to 0.6	5 to 35	1.4	0.9
Skull	0.05 to 0.45	5 to 35	1.4	0.9
CSF	0.015 to 0.1	1 to 3.7	1.4	0.9
GM	0.05 to 0.5	5 to 35	1.4	0.9
WM	0.025 to 0.25	15 to 105	1.4	0.9
Sinus	0	0	1	—