The spectral image may be a three dimensional image that provides spectral intensity values for each of a number of wavelengths at {HEAD ~ each} of {TAIL ~ a number} of positions within a two dimensional image plane 
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The spectral image may be a three dimensional image that provides spectral intensity values for each of a number of wavelengths at { HEAD ~ each } of { TAIL ~ a number } of positions within a two dimensional image plane
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH