Table 1.

Measured values of ${\mu }_{\mathrm{s}}^{\prime }$ in the longitudinal and radial directions at 633 nm.

Species	Tissue type	${\mu }_{{\mathrm{s}}_{\text{Long}}}^{\prime }$ (1/mm)	${\mu }_{{\mathrm{s}}_{\mathrm{Rad}}}^{\prime }$ (1/mm)
Human (fresh)	White matter	$1.56\pm 0.2$	$3.51\pm 0.3$
	Gray matter	$2.61\pm 0.2$	$2.69\pm 0.3$
Human (fixed)	White matter	$1.59\pm 0.1$	$3.46\pm 0.3$
	Gray matter	$2.24\pm 0.2$	$2.57\pm 0.2$
Macaque (fixed)	White matter	$1.58\pm 0.2$	$3.59\pm 0.3$
	Gray matter	$2.67\pm 0.2$	$2.90\pm 0.2$