Fig. 5
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Comparison of the Ca II K (blue) and [S II] 6731 (magenta) lines for a selection of RU Lup spectra. From top to bottom, the spectra are from UVES, ESPaDOnS, and ESPRESSO. The Ca II K lines were scaled by a factor of 1/40. The shaded areas trace the evolution of the two components, while the vertical lines mark the peak vrad of the HVC.
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