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