A Fourier transform is performed on the windowed spectral image data along the λ dimension, at {HEAD ~ locations} along the x dimension and y dimension, to generate {TAIL ~ Fourier coefficients} associated with each of the locations 
to generate
A Fourier transform is performed on the windowed spectral image data along the λ dimension , at { HEAD ~ locations } along the x dimension and y dimension , to generate { TAIL ~ Fourier coefficients } associated with each of the locations
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH