True values (circles) and predictions (lines) for the inner slope of the dark matter density profile as a function of the stellar-to-halo mass ratio for different values of M_★, post/M_★, pre via the fit by Eq. (6) with the parameters shown in Table 4. Dashed black lines indicate fits using only the stellar-to-halo mass ratio, described by the parameters in Table 1 for Eq. (2). Top panel: Results for the NIHAO suite. Bottom panel: Same but for galaxies from the FIRE-2 dataset.