Table 2: Zero points, color terms and airmasses for the different pointings and filters. Date and airmass (X) refer to the image taken as reference when the relative photometry was computed. The last column gives the values to be added to the Vega-system magnitudes to obtain AB magnitudes.
Pointing Date Filter $\alpha$ $\beta$ $\varepsilon$ rms X AB corr

1 Nov. 1999 Loiano 0.21 $\pm$ 0.02 22.15 $\pm$ 0.06 0.43 $\pm$ 0.02 0.06 1.125 0.73

2 Nov. 2000 ESO U/360 0.08 $\pm$ 0.02 22.01 $\pm$ 0.02 0.49 0.06 1.105 0.94

3 Oct. 2001 ESO U/360 0.08 $\pm$ 0.02 22.10 $\pm$ 0.02 0.44 $\pm$ 0.03 0.04 1.139 0.94

**Table 2:** Zero points, color terms and airmasses for the different pointings and filters. Date and airmass (X) refer to the image taken as reference when the relative photometry was computed. The last column gives the values to be added to the Vega-system magnitudes to obtain AB magnitudes.
Pointing	Date	Filter	$\alpha$	$\beta$	$\varepsilon$	rms	X	AB corr
1	Nov. 1999	Loiano	0.21 $\pm$ 0.02	22.15 $\pm$ 0.06	0.43 $\pm$ 0.02	0.06	1.125	0.73
2	Nov. 2000	ESO U/360	0.08 $\pm$ 0.02	22.01 $\pm$ 0.02	0.49	0.06	1.105	0.94
3	Oct. 2001	ESO U/360	0.08 $\pm$ 0.02	22.10 $\pm$ 0.02	0.44 $\pm$ 0.03	0.04	1.139	0.94

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