Test of MV1 applied only to the FR core. The results are shown in function of ρ_b = ρ_front = ρ_rear, so with flux balance between the front and rear. Panels a,b: b/a = 1, panel c) b/a = 2. Panel a: ζ = 0 (no expansion), panels b,c) ζ = 1 (typical observed expansion). The curves are drawn for ρ_b >  p (otherwise the FR core is not crossed) where p = 0.3. Left column: θ_x, θ_y, θ_z are the angles in degrees between the x, y, z directions, respectively, of the FR and MV frames. Middle left column: Δi and Δλ quantify the difference of axis orientations between the FR and the one found by MV, so the orientation biases. Middle right column: ratios of the eigenvalues eν_min, eν_int and eν_max. Right column: ratio of the maximum values of B_z, MV to B_z, FR (amplified by a factor of 100 for the first ratio). The horizontal dashed dotted lines and the yellow regions are landmarks.