Polarization degree amplitude (top) and average (bottom) values per rotation period for different axis inclination angles at λ = 4450, (normalized to 90°). Models are the same as in Fig. 4. For each model, different spot coverages were tested, using two scalings for σ_A with n_σ, equal to 0.5 (dash-dotted line) and 1.0 (dashed line). The average curve from all simulations is shown as the black solid line.