(a) ENA model variant 1: use J. Giacalone et al. (2021) ion distribution instead of J. Giacalone et al. (2025). (b) ENA model variant 2: increase the interstellar neutral density n_H from 0.1 to 0.15 cm⁻³. (c) ENA model variant 3: change the neutral flow velocity from sunward (u_H = [−26, 0, 0] km s⁻¹) to antisunward (u_H = [26, 0, 0] km s⁻¹). (d) ENA model variant 4: artificially decrease the radial flow velocity V_r in the heliosheath.