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Summary ï Observations are consistent with grain growth in disks, at least up to cmsized particles + ï This seems to happen independent of the stellar luminosity ï There are evidence for vertical settling as well as vertical mixing ï There are evidence for radial dust transportation and differential grain growth - ï Different observations probe different regions: ï Disk opacity ï Temperature gradient => this complicates the interpretation ï Solid bodies larger than ~ cm are invisible ! ï No clear temporal dependence 50
