Comparison between observed (top panel) and modeled (bottom panel) line profiles. In each panel, spectra at four different phases are shown: (1) before the eclipse (black solid lines); (2) during the first half of the eclipse (blueshifted red dashed lines); (3) during eclipse maximum (blue dashed lines); and (4) during the second half of the eclipse (redshifted red dashed lines). The configurations of the four phases are shown in Fig. 3.