Size of DM cores. Left: halo concentration-halo mass relation. The concentrations c_vir for z ≃ 1 SFGs, derived from our 3D modeling of the [O II] rotation curves, are converted to a DM-only NFW equivalent c_vir, DMO (see text). Right: DM core size r_s, DMO ≡ R_vir/c_vir, DMO in kpc as a function of halo mass. The dotted line represents the observed core-mass scaling relation for z = 0 LSBs from Di Paolo et al. (2019) (see text). In both panels, the solid lines represent the c_vir − M_vir relation predicted by Dutton & Macciò (2014) for DM halos, color-coded by redshift. The error bars are 95% confidence intervals (2σ) and color-coded also by the galaxy redshift.