CSM density structure (top panel) and mass-loss rate (bottom panel), as estimated from the bolometric light curve of iPTF13z with the model described in Sect. 3.6. For these plots, we use ϵ = 0.3, vw = 100 km s-1, and SN shock velocity, as plotted in Fig. 13. Dashed vertical lines show, in corresponding colour, where the assumption about constant velocity later than 600 days is used in the CSM density and mass-loss calculations.
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