Intensity (left column), Q/I (middle column), and U/I (right column) as a function of vacuum wavelength for the Mg II k line obtained with PRD–AA (dashed lines) and PRD–AD (solid lines) calculations in a dynamic magnetic atmosphere (see text) for the two LOSs with µ = 0.1 (first row) and µ = 1 (second row). The blue and red curves correspond to calculations carried out with the HanleRT-TIC and the TRAP⁴ code, respectively. The reference direction for positive Stokes Q is the parallel to the limb.