Table 1: The COMBO-17 filter set: exposure times and 10 $\sigma$ magnitude limits reached for point sources, averaged over all three fields. The R-band observations were selected to be taken under the best seeing conditions (FWHM $0\hbox{$.\!\!^{\prime\prime}$ }55\ldots0\hbox{$.\!\!^{\prime\prime}$ }8$ ). See also Fig. 1.
$\lambda_{{\rm cen}}$ /fwhm (nm) $t_{\rm {\rm exp}}$ /s $m_{\rm {\rm lim},10\sigma}$

364/38 U 20 000 23.7

456/99 B 14 000 25.5

540/89 V 6000 24.4

652/162 R 20 000 25.2

850/150 I 7500 23.0

420/30 8000 24.0

462/14 10 000 24.0

485/31 5000 23.8

518/16 6000 23.6

571/25 4000 23.4

604/21 5000 23.4

646/27 4500 22.7

696/20 6000 22.8

753/18 8000 22.5

815/20 20 000 22.8

856/14 15 000 21.8

914/27 15 000 22.0

**Table 1:** The COMBO-17 filter set: exposure times and 10 $\sigma$ magnitude limits reached for point sources, averaged over all three fields. The R-band observations were selected to be taken under the best seeing conditions (*FWHM* $0\hbox{$.\!\!^{\prime\prime}$ }55\ldots0\hbox{$.\!\!^{\prime\prime}$ }8$ ). See also Fig. 1.
$\lambda_{{\rm cen}}$ /fwhm (nm)	$t_{\rm {\rm exp}}$ /s	$m_{\rm {\rm lim},10\sigma}$
364/38	U	20 000	23.7
456/99	B	14 000	25.5
540/89	V	6000	24.4
652/162	R	20 000	25.2
850/150	I	7500	23.0
420/30		8000	24.0
462/14		10 000	24.0
485/31		5000	23.8
518/16		6000	23.6
571/25		4000	23.4
604/21		5000	23.4
646/27		4500	22.7
696/20		6000	22.8
753/18		8000	22.5
815/20		20 000	22.8
856/14		15 000	21.8
914/27		15 000	22.0

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