Near-infrared spectral sequence of iPTF13bvn (black lines) compared to SN 2011dh (purple lines) and SN 2008ax (cyan lines) at similar epochs. The spectra have been normalized using the median and shifted by a constant between the epochs. The top panel shows the spectral sequence in wavelength space. In the bottom panels we highlight small sections in velocity space. The bottom-left panel displays the region around He i λ10 830; the dashed lines show a smoothed version of the previous spectra in the sequence to highlight the evolution of the line. The bottom-center panel emphasizes the region around Paschen β; the dashed lines show heavily smoothed versions of the spectra of iPTF13bvn, which should give a rough estimate of the continuum. The bottom-right panel reveals the region around He i λ20 590.
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