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Fig. G.1
The discrepancy (bottom panel) between the exact motion (top panel) and its NSH86 approximation (central panel) is negligible. This is illustrated plotting the radial motion of dust grains for S0 = 10-2, η0 = 10-2 and for 
(solid) and 
(dashed). Top: 
, middle: 
, bottom: relative difference 
.
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