Emergent Q/I profiles calculated in different atmospheric models for a LOS with μ = 0.1, taking into account PRD effects both under the AA approximation (solid lines) and in the general AD case (dashed lines). No magnetic field is considered. The considered atmospheric models are: FAL-C (red and orange lines), FAL-A (blue and light blue lines), FAL-F (green and pale green lines), and FAL-P (purple and violet lines). The reference direction for positive Q is considered to be parallel to the limb.