Dear Bruce, OK, I hear you. I'll stop obsessing about the spike and only show chi*k^2 plots in my thesis :-) More seriously -- Your answer helps put things into perspective, and the comparison between the FFT with k-range starting at 0 and 1 is instructive. It's worth noting, however, that in R space there is a hump from R=1 to R=1.4 that (to my knowledge) has no physical explanation, and which is more pronounced when the FT is taken starting at k=0. Should I not worry about this either? Thanks Silvio