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Table 1

Dense stellar fields observed to model the photometric flat-field correction.

Name RA Dec E(B − V)a

Grid-1 (winter field) 6h30m00 14d20m00 0.45 ± 0.08
Grid-2 (summer field) 21h00m00 10d00m00 0.12 ± 0.03



Average value of the dust extinction derived from the analysis of the stellar locus displacement, assuming extinction follows Cardelli et al. (1989) law with Rv = 3.1.

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