Fig. 3.
Active fraction at perihelion as a function of the nucleus size for a sample of 18 comets. The uncertainties in the active fraction (vertical error bars) include a 30% uncertainty on the water production rates (Combi et al. 2019) and the uncertainty on the nucleus size. The horizontal error bars show the uncertainties in the nucleus size. Green symbols refer to comets for which the D/H ratio in water has been measured.
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