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Fig. A.2
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The absolute magnitude of comet C/2017 K2 as a function of days to perihelion. The vertical blue dotted line represents the water ice sublimation boundary (~3 au) (Womack et al. 2017; Crovisier & Encrenaz 2000), and the dashed line represents the perihelion. The inset is a zoomed-in region of the light curve around 3 au.
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