Fig. A.1.
Visual wavelength MUSE spectrum at +390 d at the site of AT 2014ej in NGC 7552, shown in the host-galaxy rest frame and plotted in black. Prominent host nebular emission features are shown in blue and are labeled, and each fit with a single-Gaussian function after the background computed by STARLIGHT (red line) was subtracted. The nebular lines that are also shown in the insets provide flux ratios indicating a super-solar metallicity (12 + log(O/H) > 8.7 ± 0.2 dex) on the O3N2 index at the location of AT 2014ej.
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