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Fig. 4.

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g-band light curve of SN 2018ibb in the context of the homogeneous ZTF-I SLSN sample. SN 2018ibb has a typical peak absolute magnitude. The rise of > 93 rest-frame days is significantly longer than of the average ZTF SLSN. The long-lasting rise implies a long diffusion time, which requires a very high total ejected mass. The high peak luminosity requires a very energetic explosion. Both properties together hint to an explosion mechanism that might be different from that of regular SLSNe.

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