Fig. 1
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Dependence of the K (see Equation (8)) value for all four planets in HR 8799, which sets the migration direction as a function of α-viscosity for this planet. The values are shown relative to Klim = 1.5 × 104 (Scardoni et al. 2022), which marks the transition between a planet migrating inward or outward. This is highlighted as gray and white regions, respectively.
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