Characteristic quantities q₊ and u₋ for all 57 considered cloud configurations under the assumption that the planetary signal can be separated from the stellar radiation (stellar radiation excluded) at an optimal wavelength of λ = 850 nm. The tuples of the characteristic quantities with equal total cloud coverages c_tot are connected by solid lines and are represented by the same color. The tuples of the characteristic quantities with equal cap asymmetries σ_NS are connected by dashed lines. The error boxes indicate the uncertainties as expected for a polarimetric precision of ∆ p = 0.1%.