Fig. 9
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Spectral index and flux-averaged optical depth distribution at 1 mm (τ1 mm), selecting disks with 10−3.5 ⩽ α ⩽ 10−2.5, 10−2.3 M⋆ ⩽ Mdisk ⩽ 10−0.5 M⋆, υfrag ≥ 500 cm s−1, mp ≥ 150 M⊕, and rp ≤ 0.75 rc. The optical depth associated with each bin is the mean of the flux-averaged optical depths of the disks belonging to each bin.
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