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Table 1
Properties of Group I and II disks from different observational techniques.
| Technique | Group I | Group II | Illustrative reference |
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| Near-IR scattered light | Routinely detected | Mostly undetected | Garufi et al. (2014) |
| Near-IR ro-vibrational lines | Hot, from larger radii | Cold, from smaller radii | van der Plas et al. (2015) |
| Mid-IR continuum | Routinely resolved | Typically unresolved | Mariñas et al. (2011) |
| Silicate emission features | Often detected | Always detected | Meeus et al. (2001) |
| Far-IR emission lines | Routinely detected | Mostly undetected | Meeus et al. (2012, 2013) |
| Millimeter continuum | Routinely resolved | Mostly unresolved | Mannings & Sargent (1997) |
| Stellar abundances | Fe, Mg, Si subsolar | Fe, Mg, Si solar-like | Kama et al. (2015) |
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