Interpolating functions ν(β) = [1 + (1 + 4β^-1)^{1 / 2}] / 2 (dot-dashed line) and ν(β) = [1−exp(−β^{1 / 2})] ^-1 (solid line) as functions of heliocentric distance Ξ. β ≡ g_N/a₀ is approximated with , i.e. vectors of external and internal Newtonian gravity are assumed to be perpendicular to each other for simplicity. The two topmost horizontal dashed lines are the values ν-functions asymptote to under the condition Ξ → ∞ (then ), the downmost ν = 1 marks the Newtonian limit. Vertical dashed lines from left to right indicate the aphelia of Neptune and Sedna and the distances where GM_⊙/ Ξ² = g_e = 1.9a₀ and GM_⊙/ Ξ² = a₀. The dotted line is β^{− 1 / 2} = [(GM_⊙/ Ξ²) /a₀] ^{− 1 / 2}, the deep-MOND limit of ν(β), in the case of no external field.