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