Table 1: Characteristics of the data.
Date Telescope Instrument FOV Pixel scale Exp. time $\sigma_{K}$ ${\rm seeing}$ $\mu_{K,\rm lim}$
(1) (2) (3) (4) (5) (6) (7) (8) (9)
29 Sep. 96 4.2 m WHT WHIRCAM $\sim$ $1\hbox{$^\prime$ }\times1\hbox{$^\prime$ }$ 0.240 $\hbox {$^{\prime \prime }$ }$/pixel 900 s 0.03 0.8 $\hbox {$^{\prime \prime }$ }$ 21.8
14 Oct. 97 3.5 m CAHA OMEGA $\sim$ $6\hbox{$^\prime$ }\times6\hbox{$^\prime$ }$ 0.396 $\hbox {$^{\prime \prime }$ }$/pixel 1800 s 0.06 1.2 $\hbox {$^{\prime \prime }$ }$ 20.9
15 Oct. 97 3.5 m CAHA OMEGA $\sim$ $6\hbox{$^\prime$ }\times6\hbox{$^\prime$ }$ 0.396 $\hbox {$^{\prime \prime }$ }$/pixel 1800 s 0.16 1.1 $\hbox {$^{\prime \prime }$ }$ 20.9
16 Oct. 97 3.5 m CAHA OMEGA $\sim$ $6\hbox{$^\prime$ }\times6\hbox{$^\prime$ }$ 0.396 $\hbox {$^{\prime \prime }$ }$/pixel 1800 s 0.12 0.9 $\hbox {$^{\prime \prime }$ }$ 20.9
3 Feb. 99 3.5 m CAHA OMEGA $\sim$ $6\hbox{$^\prime$ }\times6\hbox{$^\prime$ }$ 0.396 $\hbox {$^{\prime \prime }$ }$/pixel 2700 s 0.09 1.3 $\hbox {$^{\prime \prime }$ }$ 21.0

(1) Observing date. (2) Observing telescope. (3) NIR instrument used. (4) Field of view of the images. (5) Pixel scale. (6) Exposure time used in the science exposures. (7) Photometric error derived from the standard deviation around the mean photometric zero-point per night. (8) Mean FWHM of field stars on the images along each night. (9) Mean 3$\sigma $ limiting surface brightness magnitude of the science exposures for each night.


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