Illustration of radiative-transfer results when the blob-opening angle is varied. Top: comparison of the normalized total flux F_I (upper panel), the normalized polarized flux F_Q (middle panel), and the polarization P (bottom panel) along a 90 deg inclination for the set of models differing in blob opening angle. The models have been smoothed with a Gaussian kernel (FWHM of 23.5 Å). In all cases, the electron-density enhancement is characterized by V_blob = 4000 km s⁻¹, δV_blob = 1000 km s⁻¹, and N_e,fac = 20. The radial blob optical depth is 0.44. Bottom: comparison between the total flux F_I (black; only one curve is shown since F_I is essentially independent of the choice of opening angle – see top panel) and the scaled polarized flux |F_Q | across the Hα profile for the same model set as shown at top.