{HEAD ~ The method} may further include filtering {TAIL ~ the Fourier} transformed data to retain a subset of the Fourier coefficients at each of the locations 
include filtering
{ HEAD ~ The method } may further include filtering { TAIL ~ the Fourier } transformed data to retain a subset of the Fourier coefficients at each of the locations
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH