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Fig. 13

image

Hα profiles at selected epochs, redshifted to the line rest wavelength (blue) and mirrored with respect to the computed centroids (magenta). Lines show highly symmetric profiles, with blue and red wings overlapping almost perfectly at all phases. Small asymmetries in the top part of the lines are due to the presence of the narrow P Cygni features, more evident in the higher resolution spectra. Phases refer to the estimated epoch of the explosion.

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