Comparison of dust-mass loss and water-mass production in comet K2 as a function of time and the heliocentric distance. The dust-mass loss was computed using equation (3), and the water-mass production was computed from the OH production rate observed by TRAPPIST. The vertical dotted blue line represents the water-ice sublimation boundary (∼3 au) (Womack et al. 2017; Crovisier & Encrenaz 2000), within which the main driving source of comet outgassing changed from supervolatile ices to H₂O ice (Kwon et al. 2023). The vertical dashed line represents the perihelion.