Table 1: Summary of observations with VISIR and NACO at the ESO VLT used in this work.
Date $t_{\rm start}$ [UTC] $t_{\rm stop}$ [UTC] $\lambda_{\rm c}$a [$\mu $m] $\Delta\lambda$b [$\mu $m] DITc [s] NDITd Ne Seeingf ['']
29 May 2006 04:55 08:01 3.80 0.62 0.2 150 108 0.6''
05 June 2006 04:55 08:01 8.59 0.42 0.02 98 1104 0.6''
06 June 2006 04:33 07:37 8.59 0.42 0.02 98 1104 1.5''
05 June 2006 04:55 08:01 2.18 0.35 30 1 62 0.6''
06 June 2006 04:33 07:37 3.80 0.62 0.2 150 1104 1.5''
a Central wavelength of the filter; b FWHM of the filter; c detector integration time; d number of detector readouts averaged online; e total number of images of the target that were acquired; f average optical seeing conditions during the observations.

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