[trombonechamp]

This is something a bit different, the effect in the paper comes from the eigenvectors of the data matrix. I'm no expert on kernel density estimation, but since it is basically just convolution, I would guess the effect you are describing comes from multiplication in Fourier space.

[theGnuMe]

Thanks! Makes sense.. your paper is very good. It stresses the importance of understanding the mathematical tools we use and if we don’t how it can lead us astray.