Reynolds number as a function of heliocentric distance r for the Desch and MMSN disk models. The Remin (dashed) line corresponds to a proto-planetesimal radius and headwind velocity of (R,v∞) = (1 m,15 m s-1), while the Remax (dotted) line corresponds to (150 m,40 m s-1). The solid horizontal lines denote Reynolds numbers of 2 and 22, while the solid vertical line indicates the critical gravitational heliocentric distance for each disk model (Eqs. (20) and (21)). The successively darker shading distinguishes the regions of our parameter space that fall below Reynolds numbers of 22 and 2, respectively.
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