Eruptive mass loss less than a year before the explosion of superluminous supernovae - I. The cases of SN 2020xga and SN 2022xgc

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Fig. 17.

Modeling on the Mg II doublets originated from the CSM shell (broad features) and the ISM of the host galaxy (narrow features) for SN 2018ibb. The observed spectrum at the 2800 Å region is presented in gray and the best model fit in red. The dashed blue line illustrates the SN continuum.

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