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Transcript
Summary
 Observations are consistent with grain growth in disks, at least up to cmsized particles
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 This seems to happen independent of the stellar luminosity
 There are evidence for vertical settling as well as vertical mixing
 There are evidence for radial dust transportation and differential grain
growth
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 Different observations probe different regions:
 Disk opacity
 Temperature gradient
=> this complicates the interpretation
 Solid bodies larger than ~ cm are invisible !
 No clear temporal dependence
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