Multi-component fits to the He i and Na i D lines of iPTF13z, with the fluxes, FWHM velocities, and velocity shifts plotted in the right panels. The black diamonds in the middle right plot show the resolution of the spectra. The epochs of the bumps are marked with vertical dashed blue lines (labelled B1−4, upper right panel). The blue symbols and lines in the subplots to the right show measurements of the He i λ5876 line; cyan shows measurements of the He i λ7065 line. From 345 days onwards, a double Lorentzian (in green) was also fitted to account for the Na i D line. A Lorentzian shown in magenta was fitted to the host galaxy He iλ5876. Errors for the He i lines were estimated as in Fig. 10 for Hα.
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