Fig. 3

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Calculated Stokes number. The blue lines indicate the cases where CO abundance is assumed to be 10−4, 10−5, and 10−6 from top to bottom. The red lines show values when assuming the gas-to-dust ratio is always 100. The green lines mark the drifting barriers Eq. (12) or St = 1, depending on which one is smaller. As we assume the gas-to-dust ratio is equal to 100, Eq. (12) can be simply written as Stdrift = 0.005/η.
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