Spectral evolution of the Hα region of SN 2018bsz (left) and the Type IIn SNe 2013L, 1998S and PTF11iqb (right). The Hα has a multi-component profile similar to the shown literature SNe IIn. All spectra have been binned to 5 Å, but unbinned spectra are shown for SN 2018bsz. The literature spectra were first published in the following papers: SN 1998S (Leonard et al. 2000; Pozzo et al. 2004), PTF11iqb (Smith et al. 2015) and SN 2013L (Andrews et al. 2017) and the data were downloaded from the Open Supernova Catalog (Guillochon et al. 2017) and WISeREP (Yaron & Gal-Yam 2012).