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