Fig. 17.
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Hα line profiles of SN 2021irp and other selected interacting SNe at similar epochs. The peaks of the emission line are normalised to one using the maximum flux in the Hα region, except for in the 528 d spectrum of SN 2021irp, where we use the section between the narrow Hα and narrow [N II] λ6548 lines which may arise from the galaxy. The latest spectrum of SN 2021irp is slightly smoothed for clarity.
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