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