This spectral reflectance can be also measured using a spectrophotometer or a spectral reflectometer, or may be measured using the densitometer for measuring {TAIL ~ the optical density} as a logarithm of {HEAD ~ the spectral reflectance} 
This spectral reflectance can be also measured using a spectrophotometer or a spectral reflectometer , or may be measured using the densitometer for measuring { TAIL ~ the optical density } as a logarithm of { HEAD ~ the spectral reflectance }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD