From left to right: a) Correlation between the half line width at 10% of the maximum flux of 12CO and 13CO emission. The 1:1 ratio is overplotted with a red line. b) Correlation between the ratio of the 10% widths and the onset of the 12CO emission as derived from the half width at 10% of the maximum flux. c) Correlation between the CO and [O i] inner radii, the red line denotes the 1:1 ratio. d) Correlation between the CO inner radius and the /L∗ ratio. Sources are named according to Col. 1 from Table 1. Flaring disks are marked in blue, self-shadowed disks in green and disks with an inner opacity hole are plotted in gray.
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