Comparison of the normalized total flux F_I (top), the normalized polarized flux F_Q (the normalization is done at the location where |F_Q| is maximum), and the polarization P along a 90 deg inclination for the set of models differing in the value of N_e,fac, which increases from 2 to 5, 20, and 100 (the blob radial optical depth increases from 0.044, to 0.109, 0.436, and 2.178). The electron-density enhancement is otherwise characterized by V_blob = 4000 km s⁻¹, δV_blob = 1000 km s⁻¹, and an opening angle of 20 deg. The synthetic spectra have been smoothed with a Gaussian kernel (FWHM of 23.5 Å). We note that the normalized F_Q is independent of N_e,fac but that P strongly increases with N_e,fac. Varying N_e,fac impacts the level of polarization but not its qualitative behavior. We are in a linear regime whereby P_cont ∝ τ_blob ∝ N_e,fac.