Spread in pre-SN appearance due to the uncertainty in wind mass loss. Each color represents an initial mass MZAMS, each marker corresponds to a different efficiency factor η. The vertical dot-dashed lines indicate the BSG-YSG boundary, and YSG-RSG boundary according to Georgy et al. (2017). 35 M⊙ models exhibit a larger spread, because some models (indicated by a thick black edge on their markers) develop into WR stars.
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