Almost spherical model of ε Ori based on PIONIER observations in H-band with fixed v sin i (Puebla et al. 2016). Left: Squared visibility vs projected baseline B/λ. Right: Corresponding triangular mesh with the passband intensities (greyscale). The model was converged starting with the parameters from Table 3 (bold line). The best-fit was with χ_VIS² = 11.23. The free parameters were i = 13.6 deg, m = 20.3 M_⊙, Ω = 293.7 deg, P_rot = 4.01 d. The fixed parameters were v sin i = 70 km s⁻¹, T = 25 000 K, γ = 25.9 km s⁻¹ and the derived parameters were v = 298 km s⁻¹, R_equiv = 22.43 R_⊙(derived), R_pole = 22.29 R_⊙ (derived), R_equ = 22.46 R_⊙ (derived), θ_equiv = 0.543 mas. The star is close to critical rotation and has an almost pole-on orientation in order to decrease projected rotation (cf. v sin i).