Fig. 9.
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HST/STIS with the G230LB grism on 2022 April 11 (+158d). The original science spectrum (gray) has been smoothed (black) using a Savgol filter with window size equal to 11 with a second-order polynomial. In the inset we show a close-up of the broad feature around 2759Å and include the expected wavelengths for both the interstellar (blue) and the SN 2021adxl (green) lines.
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