Left: fit to the Hα line profiles on the + 79 d, + 94 d, + 111 d and + 138 d spectra using a combination of Lorentzian and Gaussian functions. Right: evolution of the continuum-subtracted Hα profile over a selection of phases. The line profiles were normalized to their peak values in order to highlight their evolution. Phases referto the estimated epoch of the explosion.
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