Fractional linear polarization profiles Q/I for the core and near-wing region of the K line for the disk-center LOS, with μ = 1. The curves represent emergent profiles for syntheses with different magnetic field strengths, as indicated in the legend. Results for B = 0 − 10 G are shown in the upper panel, B = 10 − 100 G in the central panel, and B = 100 − 1000 G in the lower one. The B = 10 G case is represented in the upper and central panel as a solid orange curve in order to facilitate the comparison. Likewise, the B = 100 G is shown in the central and lower panels as a solid grey curve. The reference direction for positive Stokes Q is the perpendicular to the magnetic field.