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 Fourier coefficients associated with each of {TAIL ~ the locations} 
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 Fourier coefficients associated with each of { TAIL ~ 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 OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL