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Table 1:

Details of the imaging observations used in this work.
Date $\lambda_{\rm central}$ [$\mu$m] $\Delta\lambda$ [$\mu$m] N NDIT DIT [s]
03 May 2002 2.18 0.35 20 3 20
10 May 2003 2.18 0.35 19 120 0.5
12 June 2004 2.06 0.06 96 1 30
12 June 2004 2.24 0.06 99 1 30
13 June 2004 2.33 0.06 119 1 30
13 May 2005 2.18 0.35 103 60 0.5
29 April 2006 1.66 0.33 32 28 2
29 April 2006 2.18 0.35 32 28 2
01 June 2006 2.18 0.35 80 3 10
28 May 2008 2.18 0.35 35 4 10
28 May 2008 2.18 0.35 20 2 20
offset fields          
11 Aug. 2004 2.18 0.35 16 3 40
27 July 2005 2.18 0.35 8 4 15
28 May 2008 2.18 0.35 20 20 2
DIT is the detector integration time, NDIT is the number of integrations that were averaged on-line by the read-out electronics, N is the number of (dithered) exposures (terminology of ESO observations). The total integration time of each observation amounts to N $\times $ NDIT $\times $ DIT. The pixel scale of all observations is 0.027'' per pixel.

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