Top: example best-fit curves to the RVD profile of sample SII for masses ranging from 0.5 × 10¹¹  M_⊙ to 10    ×    10¹¹  M_⊙ (A: 0.5 × 10¹¹  M_⊙, B: 1.02 × 10¹¹  M_⊙, C: 1.3 × 10¹¹  M_⊙, D: 2.09 × 10¹¹  M_⊙, E: 2.4 × 10¹¹  M_⊙, F: 10.2 × 10¹¹  M_⊙), assuming d = 8 and u_a = 18   kpc, u_b = 240   kpc (⇒0 < e < 0.83). The light gray region is the uncertainty in the RVD profile corresponding to vertical bars in Fig. 3. Middle: corresponding (symmetrized) anisotropy parameter. Bottom: mean eccentricity.