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. 12.

Fe II ejecta velocities of SN 2020xga and SN 2022xgc as measured from the X-shooter spectra as a function of time. The velocity evolution of the ZTF SLSN-I sample is shown in gray for comparison. The vertical dash-dotted line illustrates the phase of the maximum light.

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