Results for the Kerr a_* = 0.6–dilaton black hole test with varying black hole mass. The panels show the distribution of the total (top left), the position angle, ϕ (top right), and the black hole mass (bottom). In each violin, the left-hand side corresponds to and the right-hand side corresponds to . The numbers above the violins indicate the results of the two-sided K–S test. The red line in the middle and right panel corresponds to the initial position angle ϕ = 0 and initial black hole mass M_bh = 4.14 × 10⁶ M_⊙ used for the GRRT images.