in the properly renormalized theory are consistent with experimental observations.[@Lonzarich_Taillefer_1985]

Equations (\[eq:3.5\]) and (\[eqs:3.17\]) show that the dipole-dipole and DM interactions, within the framework of the bare theory, are weaker than the exchange interaction by a factor of $(\vF/c)^2$, or about $10^{-4}$.[@dipole_strength_footnote] Relative to the bare exchange interaction, this implies an energy scale on the order of $10\,\text{K}$, which is comparable with the ordering temperature in MnSi. On the other hand, the length scale associated with the DM interaction (i.e., the pitch length of the spin helix[@pitch_footnote]) is only about $200\,\AA$ (in MnSi)[@Ishikawa_et_al_1985] to $700\,\AA$ (in FeGe),[@Lebech_Bernhard_Freltoft_1989] or only a factor of $10^{2}$ to $10^{3}$ larger than the atomic length scale.

These observations indicate that there are strong renormalizations, due to band-structure and many-body effects, of all terms in the bare action, and that different terms are renormalized in different ways in different materials. While this makes it hard to make general statements, the bare theory suggests that the DM interactions and the dipole-dipole interaction are generically comparable in strength, and in MnSi, for instance, both are expected to be a substantial fraction of the (greatly reduced by renormalizations) exchange interaction. We thus conclude that there is no a priori 