Dependence of the dynamo effectivity range λ_R (left) and the amplitude A (right) of the asymptotic dipole contribution factor of bipolar sources on selected parameter combinations in various SFT model setups for σ₀ = 6°. In the left-hand panel the solid line shows the analytic result (22) in the low-latitude Cartesian limit, while the dashed line shows a fiducial analytic fit of the type (26). In the right-hand panel the shaded region is the range expected for a sin ⁿ λ equilibrium polar field profile with n > 7; the horizontal line marks the value for n = 8.