(a) M₁(i) from the mass function assuming the upper limit on f and M₂ = 0.78 M_⊙ and the lower limit on f and M₂ = 0.2 M_⊙, shown by the upper and lower blue curves, respectively. (b) The solid and dashed red curves give the upper limit on i(D) from the angular velocity of the fastest knot observed by C. M. Wood et al. (2025) for the best fit of μ and their limits, respectively; see Equation (3). The blue solid curves give the upper limits corresponding to L = L_Edd for the luminous hard state based on H.-X. Liu et al. (2024) with the same assumptions on M₁ as in panel (a). (c) The solid and dashed red curves give the upper limit on D(i) from Equation (3), analogous to panel (b). The blue curves show the upper limits on D assuming L_bol = L_Edd. The dotted magenta lines at i = 37° on all panels correspond to M₁ ≈ 13 M_⊙.