Understanding the output generated using rehh package

Question

[taniamahmood38]

Dear all,

I have computed the sfs statistics using rehh package on my pooled-seq data. The output I got has all zeroes in Fay's and Wu's column. I have read its help and found that they have explained something similar to my results in polarized argument that Tajima's D remains unchanged, Fay & Wu's H is always zero for folded spectra and Zeng's E becomes equal to Tajima's D. I dont know what does this folded spectra means? And how to resolve this issue. Please help me out in this regard.

Many thanks in advance