Extent of migration Δa = a − astart as a function of the disk lifetime τdisk for synthetic planets eventually ending up as giant planets (M ≥ 300 M⊕). Symbols indicate relative surface densities of planetesimals ΣS/ΣS,SN: red filled squares are low ΣS/ΣS,SN < 2. Black triangles are intermediate ΣS/ΣS,SN (2 to 4), and green open circles are disks with a high ΣS/ΣS,SN > 4. The solid line indicates the very roughly linear behavior of Δa as a function of τdisk. There are however large systematic departures from this simple dependence.
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