Comparison of the three best models obtained with different assumptions on f_j, f_M, and f_V with the data from SPARC galaxies (circles) and LITTLE THINGS galaxies (diamonds). Each column shows the fits for a given model, following the assumptions in Sect. 3.3. The top row is for the stellar Tully–Fisher relation, the middle row is for the size–velocity relation, while the bottom row is for the angular momentum–velocity relation. The white filled points in the plots are the galaxies which do not satisfy the Lelli et al. (2016b) criterion on the flatness of their rotation curves. The yellow filled points in the j_⋆ − V_flat relation are the 92 SPARC galaxies with “converged” j_⋆ profiles, following Posti et al. (2018a).