A window is applied to the spectral image data along the λ dimension, to select a subset of {HEAD ~ the spectral image data} corresponding to {TAIL ~ a range} of wavelengths 
corresponding to
A window is applied to the spectral image data along the λ dimension , to select a subset of { HEAD ~ the spectral image data } corresponding to { TAIL ~ a range } of wavelengths
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH