ΛCDM priors: the halo mass–concentration relation (left panel) from DM-only simulations (Dutton & Macciò 2014) and the stellar-to-halo mass relation (right panel) from abundance matching (Moster et al. 2013). In both panels, red circles show the best-fit halo masses and concentrations of the initial NFW halos. Dark and light gray bands show the expected 1σ and 2σ regions, respectively. Both relations are imposed as priors in fitting rotation curves. Our results show larger scatters than the simulation predictions.