Table 3: Measured mean visibility moduli below and above the silicate absorption, centered at 9.8 $\mu $m.
Julian date PBa PAa Visibility
  [m] [deg E of N] 8-8.7 $\mu $m 11.8-13 $\mu $m
    #1 night: 2004-07-07
2453194.7 45.7 46 0.17 $\pm$ 0.05 0.27 $\pm$ 0.04
2453194.7 42.3 52 0.20 $\pm$ 0.06 0.28 $\pm$ 0.04
2453194.8 37.0 55 0.24 $\pm$ 0.07 0.34 $\pm$ 0.04
2453194.9 26.4 53 0.47 $\pm$ 0.19 0.53 $\pm$ 0.10
    #2 night: 2004-07-08
2453195.5 44.9 11 0.22 $\pm$ 0.06 0.32 $\pm$ 0.06
2453195.7 43.5 50 0.22 $\pm$ 0.05 0.26 $\pm$ 0.04
    #3 night: 2005-05-25
2453516.6 45.8 89 0.17 $\pm$ 0.03 0.25 $\pm$ 0.04
    #4 night: 2005-06-23
2453545.5 45 89 0.10 $\pm$ 0.05 0.18 $\pm$ 0.05
2453545.5 46.8 90 0.11 $\pm$ 0.04 0.22 $\pm$ 0.04
    #5 night: 2005-06-27
2453549.8 54 139 0.13 $\pm$ 0.02 0.22 $\pm$ 0.03
    #6 night: 2005-07-20
2453572.5 58.6 101 0.10 $\pm$ 0.04 0.21 $\pm$ 0.05
2453572.7 59.6 124 0.08 $\pm$ 0.03 0.18 $\pm$ 0.04
    #7 night: 2005-08-23
2453606.5 62.5 112 0.05 $\pm$ 0.02 0.15 $\pm$ 0.04
2453606.6 54.9 136 0.05 $\pm$ 0.02 0.12 $\pm$ 0.04
a PB and PA stand for projected baseline length and position angle and characterize
the interferometric resolution at the time of the observation.

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