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Fig. 3
Radial motion 
of dust grains in the Epstein regime for η0 = 10-2. S0 varies from 10-4 to 102. Top: p = 0, 
, here 
and the grain is accreted onto the central star in a finite time. Bottom: 
, , here 
and the grain piles up and is consequently accreted onto the central star in an infinite time.
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