Fractional linear polarization Q/I (upper panels) and U/I (lower panels) profiles for the region around the H and K lines (left panels) and the core of the H line (right panels). The 3T multi-term atomic models are considered, so J-state interference is accounted for. The emergent profiles are shown for a LOS with μ = 0.1. The curves represent emergent profiles for syntheses considering a horizontal magnetic field (θ_B = 90°) with different strengths, indicated in the legend. The reference direction for positive Stokes Q is the parallel to the nearest limb.