Stokes I (left panel) and Q/I (right panel) profiles as a function of wavelength obtained from PRD calculations in the absence of a magnetic field. The black and red curves represent the calculations obtained considering the redistribution matrices given in Eqs. (10) and (11) and those given in Eq. (C.23), respectively. The latter calculation was considered in order to reproduce the results of Belluzzi et al. (2012).