Figure showing the ratios of the initial location to the critical location (r_crit) where giant planets started rapid gas accretion (solid lines), representing Type 1 migration. Dashed lines show the ratios of r_crit to the final location, representing Type 2 migration. Red, green, and magenta lines represent planets formed in wind-driven discs with λ = 1.6, 3, and 17, respectively, while blue lines represent those formed in purely viscously evolving discs.