  This response on a Comment on Reference 2 discusses the space group Fmm2
determination of the low temperature structure of NaV2O5. We show that while
conventional crystallography is consistent with 'zig-zag' charge ordering of
half of the ladders, recent spectroscopic measurements suggest that the
symmetry is lower than Fmm2. We suggest space group C2, consistent with full
'zig-zag' charge ordering of all the ladders.
