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Fig. 2

image

Line profile evolution of the transitions NaI D, Fe II 5169 Å, Hγ, and Ca II K in the early decline (day +2 to day +54) HERMES spectra. In each panel time increases from bottom to top. The epoch of each spectrum being on the left side of the figure. The y axis unit (ADU) have been omitted since the spectra are not flux calibrated and the spectral signatures have not been properly removed. However, day 2 transitions are plotted as in the original spectrum with the 0 counts level matching the x axis. The subsequent epochs have been offset by 0.75 ADUs in the case of the NaI D, 0.70 ADUs in the case of the Fe II 5169 Å transition, 0.85 ADUs in the case of Hγ and 3.5 ADUs in the case of the CaII K transition.

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