Table 4: Table of Strömgren observations of M 55. The columns show the central coordinates of the observed fields and the exposure times in the different filters. Certain parts of these fields overlap with those of the FORS2 spectroscopic observations.
Date Field $\alpha_{2000}$ $\delta_{2000}$ Exp. time(v) [s] Exp. time(b) [s] Exp. time(y) [s]

2001/07/12 M 55-1 19:40:19.0 -30:59:30.0 2 $\times$ 30, 3 $\times$ 240 1 $\times$ 20, 2 $\times$ 90 3 $\times$ 10, 3 $\times$ 60

2001/07/13 M 55-2 19:40:19.0 -30:53:30.0 1 $\times$ 30, 2 $\times$ 240 1 $\times$ 20, 2 $\times$ 90 1 $\times$ 10, 2 $\times$ 60

2001/07/14 M 55-3 19:39:47.1 -30:56:01.1 1 $\times$ 30, 2 $\times$ 240 1 $\times$ 20, 2 $\times$ 90 1 $\times$ 10, 2 $\times$ 60

**Table 4:** Table of Strömgren observations of M 55. The columns show the central coordinates of the observed fields and the exposure times in the different filters. Certain parts of these fields overlap with those of the FORS2 spectroscopic observations.
Date	Field	$\alpha_{2000}$	$\delta_{2000}$	Exp. time(v) [s]	Exp. time(b) [s]	Exp. time(y) [s]
2001/07/12	M 55-1	19:40:19.0	-30:59:30.0	2 $\times$ 30, 3 $\times$ 240	1 $\times$ 20, 2 $\times$ 90	3 $\times$ 10, 3 $\times$ 60
2001/07/13	M 55-2	19:40:19.0	-30:53:30.0	1 $\times$ 30, 2 $\times$ 240	1 $\times$ 20, 2 $\times$ 90	1 $\times$ 10, 2 $\times$ 60
2001/07/14	M 55-3	19:39:47.1	-30:56:01.1	1 $\times$ 30, 2 $\times$ 240	1 $\times$ 20, 2 $\times$ 90	1 $\times$ 10, 2 $\times$ 60

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations and reductions
	3 Grid of observed spectra
	4 Grid of synthetic spectra
	5 Artificial neural networks
	6 Validation of the network model
	7 Concluding remarks
	References