Difference between the original synthetic K I D2 Stokes profiles and those affected by the O2 band.We consider different LOS velocities (abscissas) that shift the K I D2 linewith respect to the O2 band and we represent the maximum difference for the three selected times (Sun positions) presented in Fig. 6, i.e. 00:00 (crosses), 05:00 (triangles), and 11:00 UTC (squares). The velocity sign follows the solar convention, i.e. positive velocities are associated with redshifted profiles and downflows at the solar surface.
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