Contour maps of the maximum ρ_d∕ρ_g on the plane of α_Dz∕α_acc(= α_Dr∕α_acc) and F_p/g with (a) Δx_subl= 0.1 H_g, and (b) Δx_subl given by Eq. (41). In both cases, α_acc = 10⁻² and K = 1 are adopted. Left panels: results of Monte Carlo simulations at t = 15 000 Ω⁻¹, and right ones: results after using analytical formulas given by Eq. (3) with Eqs. (35), (36), (4), and the corresponding Δx_subl. The Monte Carlo simulations were performed with a grid size of Δlog₁₀(α_Dz∕α_acc) = Δlog₁₀F_p/g = 0.2. We used more refined grids to make the maps by the analytical formulas. The color scales are based on log₁₀ (ρ_d∕ρ_g).