Table 3.

Deviations over 2 years in broadband absorption and reduced scattering of a Ph-A phantom measured at UCI by four different operators, test B1.

Test B1	${\mu }_{\mathrm{a}}$ (${\mathrm{mm}}^{-1}$)		${\mu }_{\mathrm{s}}^{\prime }$ (${\mathrm{mm}}^{-1}$)
	Stdev	NSD (%)	Stdev	NSD (%)
Spectral average	0.0004	5.3	0.02	1.8
Spectral min	0.0002	2.2	0.01	1.3
Spectral max	0.0007	8.9	0.03	2.5
Spectral median	0.0003	5.7	0.02	1.7