Lower panel: Normalized distribution of the correction term σ_axi^P/σ_sph^P at q′ = 0.9 under different values of the oblate fraction f. Upper panel: 16th (left end of the errorbar), 50th (the central marker), and 84th (right end of the errorbar) percentile corresponding to the distribution of the correction term. The difference in the median σ_axi^P/σ_sph^P at f = 0.79 and f = 0.95 is 0.105%, indicating that the relative change in the corrected velocity dispersion when f changes by two standard deviations is 0.105%. Therefore, the change in the inferred λ and H₀ when f changes by one standard deviation is 0.105%.