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Table 2

Median photophoretic velocity, width of the intensity-normalized velocity distribution function, and percentage of negative photophoresis for equivalent sub-samples (see Fig. 15) of the three materials with 55−80 μm aggregate radius.

Material N Median photophoretic Width of the velocity percentage of
velocity  [mm   s-1 distribution  [mm   s-1 negative photophoresis

SiO2black 72 19.2 44.1 16
Olivine 59 22.8 80.1 29
SiO2white 174 0.6 4.6 30

Notes. Velocities were converted to an intensity of 1   W   cm-2.

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