Table 4: Sizes of the emitting regions1.
Object SED Average Radial Half-light Half-light
  group visibility surface density radius ('') radius (AU)
  association (9-13 $\mu $m) gradient at 12.5 $\mu $m at 12.5 $\mu $m
HD 100546 I 0.040 $\pm$ 0.008 0.04 0.050 $\pm$ 3%2 5.1 $\pm$ 0.53
HD 142527 II 0.249 $\pm$ 0.055 - 0.52 0.011 $\pm$ 5%2 2.1 $\pm$ 0.23
HD 144432 II 0.183 $\pm$ 0.021 - 0.30 0.014 $\pm$ 3%2 2.1 $\pm$ 0.23
HD 163296 II 0.203 $\pm$ 0.017 - 1.18 0.007 $\pm$ 2%2 0.8 $\pm$ 0.13
HD 179218 I 0.091 $\pm$ 0.014 0.21 0.034 $\pm$ 3%2 8.2 $\pm$ 0.83
KK Oph II 0.313 $\pm$ 0.037 - 0.57 0.010 $\pm$ 5%2 1.6 $\pm$ 0.23
51 Oph II 0.643 $\pm$ 0.063 - 0.007 $\pm$ 8%3 0.5 $\pm$ 0.074
1 Derived from optically thin power law radial density distributions (see text).
2 Error from visibility uncertainty.
3 Modelling uncertainty of 10% assumed.
4 Half of the FWHM of a Gaussian distribution giving the observed visibility at 12.5 $\mu $m.

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