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Fig. 2


Line profile changes in Hα during the 2003, 2009, and 2014 events observed with UVES in direct view to the star and at FOS4. The spectra at FOS4 are corrected for the velocity shift of Δv = 100 km s-1, see Sect. 2. The key indicates the corresponding phases of the displayed spectra, see last paragraph in Sect. 2. Red spectra indicate when notable changes in the P Cyg absorption occurred. The blue tracings show the mid-cycle spectra when the companion star is at apastron and its influence on η Car’s wind structure is minimal. The spike atop the Hα profile comes from older low-velocity ejecta and not from the present-day stellar wind.

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