;The Fourier transform of the cross correlation function is the
;product of the Fourier transform of the first series and the
;complex conjugate of the Fourier transform of the second series.
Function CrossCorrelate, X, Y
  FFT_X=FFT(X,-1); Forward transformation of X
  FFT_Y=FFT(Y,-1); Forward transformation of Y
  FFT_CC=FFT_X*CONJ(FFT_Y); Product of above is Forward transformation of correlation
  return,FFT(FFT_CC,1); Inverse transform of product == correlation
end