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