HST/COS UV spectrum of SN 2021adxl taken with the G130M (FUV) and G160M (NUV) grism on 2022 April 11 (+158d). The upper panel shows the (error) spectrum given in (gray) black. The lower panel gives the science spectrum smoothed using a Savitzky–Golay (Savgol) filter with window size equal to 31 with a second-order polynomial. We include expected wavelengths for both Milky Way (MW) (in blue) and SN 2021adxl plus its host (in green), although the detection of some of these lines are unclear due to the low S/N of the science spectrum.