Scaling relations of dark matter, f_DM − Σ_bar and f_DM − V_c, shown in the left and right panels, respectively. The blue dashed line represents the best fit to the data in both relations, with the associated intrinsic scatter (ζ_int) indicated on the plot. We note that the f_DM − V_c relation can be seen as the result of a combination of the mass-velocity and mass-size relations. The color codes used for data in both panels are consistent with Figure 11. We note that the uncertainties on data points represent the 68% confidence interval.