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Fig. 7.

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Zoom-in on the Hα region of the last four spectra. The dashed red line shows how, while in the last three spectra the line profile is approximately Gaussian, the earlier one still shows an asymmetric structure due to the P-Cygni absorption. All spectra are reddening- and redshift-corrected and matched in intensity with respect to the Hα emission and arbitrarily shifted for better visualisation.

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