Table 2: J-band observations with ISAAC at the VLT/UT1.
${\rm Object}$ ${\rm Observation\ date}$ ${\rm Observation\ time}$ ${\rm Detector\ integration\ time}$ ${\rm Number\ of\ exposures}$ ${\rm Air\ mass}$

${\rm I\ Zw\ 1}$ 2001-08-19 08:05:06-08:13:17 $6.00\ {\rm s}$ 4 1.26

${\rm Standard\ star}$ 2001-08-19 06:14:20-06:16:57 $3.55\ {\rm s}$ 5 1.33-1.34

Characteristics of the ISAAC J-band filter: central wavelength $1.25\ \mu{\rm m}$ , width $0.29\ \mu{\rm m}$ .

**Table 2:** J-band observations with ISAAC at the VLT/UT1.
${\rm Object}$	${\rm Observation\ date}$	${\rm Observation\ time}$	${\rm Detector\ integration\ time}$	${\rm Number\ of\ exposures}$	${\rm Air\ mass}$
${\rm I\ Zw\ 1}$	2001-08-19	08:05:06-08:13:17	$6.00\ {\rm s}$	4	1.26
${\rm Standard\ star}$	2001-08-19	06:14:20-06:16:57	$3.55\ {\rm s}$	5	1.33-1.34

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